lintcode题解

index	title	code	Difficulty
1	A + B Problem	JavaScript	Naive
2	Trailing Zeroes	JavaScript	Easy
3	Digit Counts		Easy
4	Ugly Number II	JavaScript	Medium
5	Kth Largest Element		Medium
6	Merge Two Sorted Arrays	JavaScript	Easy
7	Serialize and Deserialize Binary Tree	Python	Medium
8	Rotate Character Array	Python	Easy
9	Fizz Buzz	JavaScript	Easy
10	String Permutation II		Medium
11	Search Range in Binary Search Tree	Python	Medium
12	Min Stack	Python	Medium
13	Implement strStr()	TypeScript	Naive
14	First Position of Target	JavaScript	Easy
15	Permutations	Python	Medium
16	Permutations II	Python	Medium
17	Subsets	Python	Medium
18	Subsets II	Python	Medium
20	Dices Sum	Python	Medium
21	Moving Circle		Medium
22	Flatten List	Python	Naive
23	Is alphanumeric	TypeScript	Naive
24	LFU Cache	Python	Hard
25	Print X	TypeScript	Naive
26	inner product		Hard
27	abc String		Hard
28	Search a 2D Matrix	JavaScript	Easy
29	Interleaving String		Hard
30	Insert Interval		Medium
31	Partition Array	TypeScript	Medium
32	Minimum Window Substring	Python	Medium
33	N-Queens		Medium
34	N-Queens II		Medium
35	Reverse Linked List	JavaScript TypeScript	Easy
36	Reverse Linked List II	JavaScript TypeScript	Medium
37	Reverse 3-digit Integer	JavaScript	Naive
38	Search a 2D Matrix II	JavaScript	Medium
39	Recover Rotated Sorted Array	JavaScript	Easy
40	Implement Queue by Two Stacks	Python	Medium
41	Maximum Subarray	JavaScript TypeScript	Easy
42	Maximum Subarray II	Python	Medium
43	Maximum Subarray III	JavaScript	Hard
44	Minimum Subarray	Python	Easy
45	Maximum Subarray Difference	JavaScript	Medium
46	Majority Element	Python	Easy
47	Majority Element II	Python	Medium
48	Majority Number III	JavaScript	Medium
49	Sort Letters by Case	Python	Medium
50	Product of Array Exclude Itself	Python	Easy
51	Previous Permutation		Medium
52	Next Permutation		Medium
53	Reverse Words in a String	Python	Easy
54	String to Integer (atoi)		Hard
55	Compare Strings	JavaScript TypeScript	Easy
56	Two Sum	JavaScript	Easy
57	3Sum	Python	Medium
58	4Sum	JavaScript Python	Medium
59	3Sum Closest	JavaScript	Medium
60	Search Insert Position	JavaScript TypeScript	Easy
61	Search for a Range	JavaScript	Medium
62	Search in Rotated Sorted Array	JavaScript	Medium
63	Search in Rotated Sorted Array II	JavaScript	Medium
64	Merge Sorted Array (easy version)	Python	Easy
65	Median of two Sorted Arrays		Hard
66	Binary Tree Preorder Traversal	JavaScript	Easy
67	Binary Tree Inorder Traversal	JavaScript TypeScript	Easy
68	Binary Tree Postorder Traversal	JavaScript TypeScript	Easy
69	Binary Tree Level Order Traversal	JavaScript TypeScript	Easy
70	Binary Tree Level Order Traversal II	Python	Medium
71	Binary Tree Zigzag Level Order Traversal	JavaScript TypeScript	Medium
72	Construct Binary Tree from Inorder and Postorder Traversal	JavaScript	Medium
73	Construct Binary Tree from Preorder and Inorder Traversal	JavaScript	Medium
74	First Bad Version	Python	Medium
75	Find Peak Element	Python	Medium
76	Longest Increasing Subsequence	JavaScript	Medium
77	Longest Common Subsequence	JavaScript	Medium
78	Longest Common Prefix	TypeScript	Medium
79	Longest Common Substring	JavaScript	Medium
80	Median	TypeScript	Easy
81	Find Median from Data Stream		Hard
82	Single Number	JavaScript	Easy
83	Single Number II	JavaScript TypeScript	Medium
84	Single Number III	Python	Medium
85	Insert Node in a Binary Search Tree	Python	Easy
86	Binary Search Tree Iterator	Python	Hard
87	Remove Node in Binary Search Tree	Python	Hard
88	Lowest Common Ancestor of a Binary Tree	Python	Medium
89	k Sum		Hard
90	k Sum II	Python	Medium
91	Minimum Adjustment Cost		Medium
92	Backpack	JavaScript TypeScript	Medium
93	Balanced Binary Tree	JavaScript TypeScript	Easy
94	Binary Tree Maximum Path Sum	JavaScript TypeScript	Medium
95	Validate Binary Search Tree	JavaScript	Medium
96	Partition List	JavaScript TypeScript	Easy
97	Maximum Depth of Binary Tree	JavaScript TypeScript	Easy
98	Sort List	Python	Medium
99	Reorder List	Python	Medium
100	Remove Duplicates from Sorted Array	Python	Easy
101	Remove Duplicates from Sorted Array II	Python	Easy
102	Linked List Cycle	Python	Medium
103	Linked List Cycle II	Python	Hard
104	Merge K Sorted Lists	Python	Medium
105	Copy List with Random Pointer	Python	Medium
106	Convert Sorted List to Binary Search Tree	Python	Medium
107	Word Break		Medium
108	Palindrome Partitioning II		Medium
109	Triangle	JavaScript	Medium
110	Minimum Path Sum	JavaScript	Easy
111	Climbing Stairs	JavaScript	Easy
112	Remove Duplicates from Sorted List	JavaScript	Easy
113	Remove Duplicates from Sorted List II	Python	Medium
114	Unique Paths	JavaScript	Easy
115	Unique Paths II	JavaScript	Easy
116	Jump Game	JavaScript	Medium
117	Jump Game II	JavaScript	Medium
118	Distinct Subsequences	Python	Medium
119	Edit Distance		Medium
120	Word Ladder		Hard
121	Word Ladder II		Hard
122	Largest Rectangle in Histogram		Hard
123	Word Search	TypeScript	Medium
124	Longest Consecutive Sequence	TypeScript	Medium
125	Backpack II	JavaScript	Medium
126	Max Tree		Hard
127	Topological Sorting		Medium
128	Hash Function	JavaScript	Easy
129	Rehashing		Medium
130	Heapify	Python	Medium
131	The Skyline Problem		Super
132	Word Search II		Hard
133	Longest Word	Python	Easy
134	LRU Cache	Python	Hard
135	Combination Sum	Python	Medium
136	Palindrome Partitioning		Medium
137	Clone Graph		Medium
138	Subarray Sum	Python	Easy
139	Subarray Sum Closest		Medium
140	Fast Power	Python	Medium
141	Sqrt(x)	Python	Easy
142	O(1) Check Power of 2	JavaScript	Easy
143	Sort Colors II	TypeScript	Medium
144	Interleaving Positive and Negative Numbers	Python	Medium
145	Lowercase to Uppercase	JavaScript	Naive
146	Lowercase to Uppercase II	TypeScript	Naive
147	Narcissistic Number		Easy
148	Sort Colors	TypeScript	Medium
149	Best Time to Buy and Sell Stock	JavaScript	Medium
150	Best Time to Buy and Sell Stock II	JavaScript	Medium
151	Best Time to Buy and Sell Stock III	JavaScript	Medium
152	Combinations	Python	Medium
153	Combination Sum II	Python	Medium
154	Regular Expression Matching		Hard
155	Minimum Depth of Binary Tree	JavaScript	Easy
156	Merge Intervals	TypeScript	Easy
157	Unique Characters	Python	Easy
158	Valid Anagram	JavaScript	Easy
159	Find Minimum in Rotated Sorted Array	JavaScript	Medium
160	Find Minimum in Rotated Sorted Array II	JavaScript	Medium
161	Rotate Image	JavaScript	Medium
162	Set Matrix Zeroes	JavaScript	Medium
163	Unique Binary Search Trees	JavaScript	Medium
165	Merge Two Sorted Lists	JavaScript	Easy
166	Nth to Last Node in List	Python	Easy
167	Add Two Numbers	JavaScript	Easy
168	Burst Balloons		Hard
169	Tower of Hanoi		Medium
170	Rotate List	JavaScript	Medium
171	Anagrams	JavaScript	Medium
172	Remove Element	Python	Easy
173	Insertion Sort List	Python	Easy
174	Remove Nth Node From End of List	JavaScript	Easy
175	Invert Binary Tree	JavaScript	Easy
176	Route Between Two Nodes in Graph		Medium
177	Convert Sorted Array to Binary Search Tree With Minimal Height.	Python	Easy
178	Graph Valid Tree		Medium
179	Update Bits	TypeScript	Medium
180	Binary Representation		Hard
181	Flip Bits	JavaScript	Easy
182	Delete Digits		Medium
183	Wood Cut	TypeScript	Hard
184	Largest Number		Medium
185	Matrix Zigzag Traversal	JavaScript	Easy
186	Max Points on a Line		Medium
187	Gas Station		Medium
188	Insert five	TypeScript	Easy
189	First Missing Positive	JavaScript	Medium
191	Maximum Product Subarray	JavaScript	Medium
192	Wildcard Matching		Hard
193	Longest Valid Parentheses	JavaScript	Medium
194	Find Words	TypeScript	Medium
196	Missing Number	JavaScript	Easy
197	Permutation Index		Medium
198	Permutation Index II		Medium
199	Judge Connection		Medium
200	Longest Palindromic Substring		Medium
201	Segment Tree Build	Python	Medium
202	Segment Tree Query	Python	Medium
203	Segment Tree Modify	Python	Medium
204	Singleton	Python	Easy
205	Interval Minimum Number	Python	Medium
206	Interval Sum	Python	Medium
207	Interval Sum II	Python	Hard
208	Assignment Operator Overloading (C++ Only)		Medium
209	First Unique Character in a String	JavaScript	Easy
210	Null-terminated String		Easy
211	String Permutation	JavaScript	Easy
212	Space Replacement	Python	Easy
213	String Compression	JavaScript	Easy
214	Max of Array	TypeScript	Naive
215	Rate Limiter		Hard
216	Substring Rotation		Easy
217	Remove Duplicates from Unsorted List		Easy
218	Student Level		Easy
219	Insert Node in Sorted Linked List		Easy
220	Hail conjecture		Easy
221	Add Two Numbers II	JavaScript	Medium
222	Setter and Getter		Naive
223	Palindrome Linked List	JavaScript	Medium
224	Implement Three Stacks by Single Array		Medium
225	Find Node in Linked List		Naive
226	Set of Stacks II		Hard
227	Mock Hanoi Tower by Stacks		Easy
228	Middle of Linked List		Naive
229	Stack Sorting		Medium
230	Animal Shelter		Hard
231	Typeahead		Hard
232	Tiny Url		Medium
233	Next Smaller and Larger Number with the Same 1 Bits		Medium
234	Web Crawler		Super
235	Prime Factorization		Easy
236	Swap Bits		Easy
237	Missing Integer		Easy
238	Monochrome Screen		Easy
239	Root of Equation		Easy
240	Program Check		Hard
241	String to Integer		Naive
242	Convert Binary Tree to Linked Lists by Depth	Python	Easy
243	Amicable Pair		Easy
244	Delete Char		Medium
245	Subtree		Medium
246	Binary Tree Path Sum II		Medium
247	Segment Tree Query II	Python	Medium
248	Count of Smaller Number	JavaScript TypeScript	Medium
249	Count of Smaller Number before itself	JavaScript	Hard
250	Special Palindrome String	TypeScript	Easy
251	Array compression		Medium
252	arithmetic matrix		Medium
253	URL Edcode	TypeScript	Easy
254	Drop Eggs		Easy
255	Multi-string search	TypeScript	Easy
256	The Maximum Order		Hard
257	Longest String Chain		Medium
258	Map Jump		Hard
259	Find the largest Divisor	TypeScript	Medium
260	Same Diagonal Elements	TypeScript	Easy
261	Maximum Connected Area		Medium
262	heir tree		Medium
263	Matching of parentheses	TypeScript	Easy
264	Counting Universal Subarrays		Easy
265	Maximum Non-Negative Subarray	TypeScript	Easy
266	Expect Distance		Medium
267	minimum rest days		Medium
268	Parentheses Score	TypeScript	Medium
269	two colors' tower		Hard
270	Letter Combinations of a Phone Number II		Medium
271	prefix notation to postfix notation		Medium
272	Climbing Stairs II		Easy
273	Test Strategy		Medium
274	Make binary tree average		Super
275	Moving Shed		Medium
276	another zuma	TypeScript	Medium
277	Word Spacing		Easy
278	Paint Fill	JavaScript	Medium
279	Number of Ways to Represent N Cents		Medium
280	Closest City	TypeScript	Easy
281	Paint the Ceiling		Medium
282	Decrypt the String	TypeScript	Easy
283	Max of 3 Numbers	JavaScript	Naive
285	Tall Building	TypeScript	Medium
286	Inversions		Hard
287	The Competition of View		Medium
288	Container Design	Python	Easy
289	Container Design II	Python	Easy
290	Sorted Arrangement		Hard
291	Second Diameter		Medium
292	Sort Anagrams Array		Easy
293	The depth of the tunnel		Medium
294	Linked List Simplification	TypeScript	Easy
295	Intersection	TypeScript	Easy
296	Unique Array		Easy
297	Find the maximum	TypeScript	Naive
298	Find prime	TypeScript	Naive
299	Typing practising		Easy
300	Meeting Room IV		Medium
301	Lucky Number II		Hard
302	Digital Pairing		Easy
303	Beautiful Number		Medium
304	Maximum product	TypeScript	Medium
305	longest increasing path in a matrix		Hard
306	Product List	TypeScript	Easy
307	Transform String		Medium
308	Special Substring		Medium
309	Interleaved Array	TypeScript	Easy
310	Digital distortion		Easy
311	Pioneering palindrome	TypeScript	Easy
312	Bull Cards		Medium
313	Minimum Insertion		Hard
314	The Lost Record		Medium
315	Reformat String	TypeScript	Medium
316	Combination set	TypeScript	Medium
317	Minimum Parentheses Matching		Medium
318	Character Grid	TypeScript	Easy
319	Square Queue		Hard
321	perfect string		Easy
322	Chess Game		Easy
323	string game		Hard
325	Football		Hard
326	Slide Soduku		Easy
327	Distance Metrics	TypeScript	Medium
328	String Partition		Medium
329	Double Array		Easy
330	Increasing Number		Medium
331	Confusing Number		Medium
332	restoreArray		Hard
333	Identifying Strings		Medium
334	Order Check	TypeScript	Easy
335	plateau		Medium
336	Text Compression		Easy
337	Team notification		Medium
339	Median II		Medium
340	Red and Black Chess		Hard
342	Valley sequence		Medium
343	Circle		Easy
344	Song Time		Hard
345	the sum of array		Easy
346	xorsum of Interval extremum		Hard
347	maximum number expectation		Hard
348	TrackSwitching	TypeScript	Medium
349	Developer-Tester Integration		Hard
350	Slash Separating		Hard
351	External Sorting Practising		Easy
352	PrettyPrint		Easy
353	Largest letter	TypeScript	Easy
354	lottery draw		Hard
355	shuttleInBuildings		Hard
357	Symmetrical Suffix		Medium
358	treePlanning	TypeScript	Easy
359	makeEquilateralTriangle	TypeScript	Easy
360	Sliding Window Median		Hard
362	Sliding Window Maximum	JavaScript	Hard
363	Trapping Rain Water		Medium
364	Trapping Rain Water II		Hard
365	Count 1 in Binary	Python	Easy
366	Fibonacci	JavaScript	Naive
367	Expression Tree Build		Hard
368	Expression Evaluation		Hard
369	Convert Expression to Polish Notation		Medium
370	Convert Expression to Reverse Polish Notation		Medium
371	Print Numbers by Recursion	JavaScript	Medium
372	Delete Node in a Linked List	Python	Easy
373	Partition Array by Odd and Even	Python	Easy
374	Spiral Matrix	JavaScript	Medium
375	Clone Binary Tree	JavaScript	Medium
376	Binary Tree Path Sum	Python	Easy
378	Convert Binary Tree to Doubly Linked List	Python	Medium
379	Reorder array to construct the minimum number		Medium
380	Intersection of Two Linked Lists	Python	Medium
381	Spiral Matrix II		Medium
382	Triangle Count		Medium
383	Container With Most Water		Medium
384	Longest Substring Without Repeating Characters	JavaScript	Medium
385	ArrayList		Easy
386	Longest Substring with At Most K Distinct Characters		Medium
387	The Smallest Difference	JavaScript	Medium
388	Permutation Sequence		Medium
389	Valid Sudoku	TypeScript	Easy
390	Find Peak Element II		Hard
391	Number of Airplanes in the Sky		Medium
392	House Robber	JavaScript	Medium
393	Best Time to Buy and Sell Stock IV	JavaScript	Medium
394	Coins in a Line		Medium
395	Coins in a Line II		Medium
396	Coins in a Line III		Hard
397	Longest Continuous Increasing Subsequence	JavaScript	Easy
398	Longest Ascent Path		Hard
400	Maximum Gap	TypeScript	Medium
401	Kth Smallest Number in Sorted Matrix	JavaScript	Medium
402	Continuous Subarray Sum	JavaScript	Medium
403	Continuous Subarray Sum II		Medium
404	Subarray Sum II		Medium
405	Submatrix Sum		Medium
406	Minimum Size Subarray Sum	JavaScript	Medium
407	Plus One	JavaScript	Easy
408	Add Binary	JavaScript	Easy
411	Gray Code	TypeScript	Medium
412	Candy		Medium
413	Reverse Integer	JavaScript	Easy
414	Divide Two Integers	TypeScript	Medium
415	Valid Palindrome	JavaScript	Medium
417	Valid Number	TypeScript	Easy
418	Integer to Roman	JavaScript	Medium
419	Roman to Integer	JavaScript	Medium
420	Count and Say		Easy
421	Simplify Path	TypeScript	Medium
422	Length of Last Word	JavaScript	Easy
423	Valid Parentheses	JavaScript	Easy
424	Evaluate Reverse Polish Notation	Python	Medium
425	Letter Combinations of a Phone Number	JavaScript	Medium
426	Restore IP Addresses	JavaScript	Medium
427	Generate Parentheses	JavaScript	Medium
428	Pow(x, n)	Python	Medium
430	Scramble String		Hard
431	Connected Component in Undirected Graph		Medium
432	Find the Weak Connected Component in the Directed Graph		Medium
433	Number of Islands	JavaScript	Easy
434	Number of Islands II		Medium
435	Post Office Problem		Hard
436	Maximal Square	JavaScript	Medium
437	Copy Books		Medium
438	Copy Books II		Hard
439	Segment Tree Build II	Python	Medium
440	Backpack III		Medium
442	Implement Trie	Python	Medium
443	Two Sum - Greater than target		Medium
444	graph valid tree II		Medium
445	Cosine Similarity	Python	Easy
447	Search in a Big Sorted Array		Medium
448	Inorder Successor in BST	Python	Medium
449	Char to Integer		Naive
450	Reverse Nodes in k-Group	JavaScript	Hard
451	Swap Nodes in Pairs	JavaScript	Easy
452	Remove Linked List Elements	JavaScript	Easy
453	Flatten Binary Tree to Linked List	JavaScript	Easy
454	Rectangle Area	Python	Naive
455	Student ID		Easy
456	Reference		Naive
457	Classical Binary Search	Python	Easy
458	Last Position of Target		Easy
459	Closest Number in Sorted Array		Easy
460	Find K Closest Elements	JavaScript	Medium
461	Kth Smallest Numbers in Unsorted Array		Medium
462	Total Occurrence of Target		Easy
463	Sort Integers	JavaScript	Naive
464	Sort Integers II	JavaScript	Easy
465	Kth Smallest Sum In Two Sorted Arrays		Hard
466	Count Linked List Nodes	JavaScript	Naive
467	Complete Binary Tree		Easy
468	Symmetric Binary Tree		Easy
469	Same Tree	JavaScript	Easy
470	Tweaked Identical Binary Tree		Easy
471	Top K Frequent Words	JavaScript	Medium
472	Binary Tree Path Sum III		Hard
473	Add and Search Word - Data structure design		Medium
474	Lowest Common Ancestor II	Python	Easy
475	Binary Tree Maximum Path Sum II		Medium
476	Stone Game	JavaScript	Medium
477	Surrounded Regions	Python	Medium
478	Simple Calculator	TypeScript	Naive
479	Second Max of Array	JavaScript	Easy
480	Binary Tree Paths	JavaScript	Easy
481	Binary Tree Leaf Sum		Easy
482	Binary Tree Level Sum		Easy
483	Convert Linked List to Array List		Naive
484	Swap Two Integers in Array	JavaScript	Naive
485	Generate ArrayList with Given Size		Naive
486	Merge K Sorted Arrays	JavaScript	Medium
487	Name Deduplication		Easy
488	Happy Number	JavaScript	Easy
489	Convert Array List to Linked List		Easy
490	Set of Stacks		Easy
491	Palindrome Number	JavaScript	Easy
492	Implement Queue by Linked List	Python	Easy
493	Implement Queue by Linked List II		Easy
494	Implement Stack by Two Queues		Easy
495	Implement Stack	Python	Easy
496	Toy Factory	Python	Easy
497	Shape Factory		Easy
498	Parking Lot		Hard
499	Word Count (Map Reduce)		Medium
500	Inverted Index		Medium
501	Design Twitter		Medium
502	Mini Cassandra		Medium
503	Anagram (Map Reduce)		Medium
504	Inverted Index (Map Reduce)		Medium
505	Web Logger		Medium
506	Movie Recommendation		Medium
507	Wiggle Sort II		Hard
508	Wiggle Sort		Medium
509	Mini Yelp		Hard
510	Maximal Rectangle		Hard
511	Swap Two Nodes in Linked List	JavaScript	Medium
512	Decode Ways	JavaScript	Medium
513	Perfect Squares	JavaScript	Medium
514	Paint Fence	TypeScript	Easy
515	Paint House	TypeScript	Medium
516	Paint House II	TypeScript	Hard
517	Ugly Number	JavaScript	Easy
518	Super Ugly Number	JavaScript	Medium
519	Consistent Hashing		Easy
520	Consistent Hashing II		Medium
521	Remove Duplicate Numbers in Array		Easy
522	Tiny Url II		Medium
523	Url Parser		Medium
524	Left Pad	Python	Easy
525	Mini Uber		Medium
526	Load Balancer		Medium
527	Trie Serialization		Hard
528	Flatten Nested List Iterator	Python	Medium
529	Geohash		Medium
530	Geohash II		Medium
531	Six Degrees		Medium
532	Reverse Pairs	JavaScript	Medium
533	Two Sum - Closest to target		Medium
534	House Robber II	JavaScript	Medium
535	House Robber III		Medium
537	N-Gram (Map Reduce)		Medium
538	Memcache		Medium
539	Move Zeroes	JavaScript	Easy
540	Zigzag Iterator	Python	Medium
541	Zigzag Iterator II		Medium
543	Kth Largest in N Arrays		Hard
544	Top k Largest Numbers		Medium
545	Top k Largest Numbers II		Medium
546	Implement Queue by Interface		Easy
547	Intersection of Two Arrays	Python	Easy
548	Intersection of Two Arrays II	JavaScript	Easy
549	Top K Frequent Words (Map Reduce)		Medium
550	Top K Frequent Words II		Hard
551	Nested List Weight Sum	Python	Easy
552	Create Maximum Number		Hard
553	Bomb Enemy		Medium
554	Sort Integers (Map Reduce)		Medium
555	Counting Bloom Filter	Python	Medium
556	Standard Bloom Filter	Python	Medium
557	Count Characters		Easy
558	Sliding Window Matrix Maximum		Medium
559	Trie Service		Medium
560	Friendship Service		Easy
561	Array Distance		Hard
562	Backpack IV	JavaScript	Medium
563	Backpack V	JavaScript	Medium
564	Combination Sum IV	JavaScript	Medium
565	Heart Beat		Medium
566	GFS Client		Medium
567	maximum score	TypeScript	Medium
568	Three Chances		Medium
569	Add Digits	JavaScript	Easy
570	Find the Missing Number II		Medium
571	Judgment repetition	TypeScript	Medium
572	Music Pairs	TypeScript	Easy
573	Build Post Office II		Hard
574	Build Post Office		Medium
575	Decode String	TypeScript	Medium
576	Split Array	TypeScript	Medium
577	Merge K Sorted Interval Lists		Medium
578	Lowest Common Ancestor III	Python	Medium
581	Longest Repeating Subsequence		Medium
582	Word Break II		Hard
584	Drop Eggs II		Medium
585	Maximum Number in Mountain Sequence	JavaScript	Medium
586	Sqrt(x) II		Medium
587	Two Sum - Unique pairs		Medium
588	Partition Equal Subset Sum	JavaScript	Medium
589	Connecting Graph		Medium
590	Connecting Graph II		Medium
591	Connecting Graph III		Medium
593	Stone Game II		Medium
594	strStr II		Hard
595	Binary Tree Longest Consecutive Sequence	JavaScript	Easy
596	Minimum Subtree		Easy
597	Subtree with Maximum Average		Easy
598	Zombie in Matrix		Medium
600	Smallest Rectangle Enclosing Black Pixels		Hard
601	Flatten 2D Vector	Python	Medium
602	Russian Doll Envelopes		Hard
603	Largest Divisible Subset		Medium
604	Window Sum	JavaScript	Easy
605	Sequence Reconstruction		Medium
606	Kth Largest Element II		Medium
607	Two Sum III - Data structure design	Python	Easy
608	Two Sum II - Input array is sorted	JavaScript	Medium
609	Two Sum - Less than or equal to target	TypeScript	Medium
610	Two Sum - Difference equals to target		Medium
611	Knight Shortest Path		Medium
612	K Closest Points		Medium
613	High Five		Medium
614	Binary Tree Longest Consecutive Sequence II	JavaScript	Medium
615	Course Schedule		Medium
616	Course Schedule II		Medium
617	Maximum Average Subarray II		Medium
618	Search Graph Nodes		Medium
619	Binary Tree Longest Consecutive Sequence III		Medium
620	Maximum Subarray IV		Medium
621	Maximum Subarray V		Hard
622	Frog Jump		Hard
623	K Edit Distance		Hard
624	Remove Substrings		Medium
625	Partition Array II		Medium
626	Rectangle Overlap		Easy
627	Longest Palindrome	JavaScript	Easy
628	Maximum Subtree		Easy
629	Minimum Spanning Tree		Hard
630	Knight Shortest Path II		Medium
631	Maximal Square II		Medium
632	Binary Tree Maximum Node	Python	Easy
633	Find the Duplicate Number	JavaScript	Hard
634	Word Squares		Hard
635	Boggle Game		Hard
636	132 Pattern		Medium
637	Valid Word Abbreviation	JavaScript	Easy
638	Isomorphic Strings	JavaScript	Easy
639	Word Abbreviation		Hard
640	One Edit Distance		Medium
641	Missing Ranges	TypeScript	Medium
642	Moving Average from Data Stream	Python	Easy
643	Longest Absolute File Path		Medium
644	Strobogrammatic Number	JavaScript	Easy
645	Find the Celebrity		Medium
646	First Position Unique Character	JavaScript	Easy
647	Find All Anagrams in a String	JavaScript	Medium
648	Unique Word Abbreviation	Python	Medium
649	Binary Tree Upside Down	JavaScript	Medium
650	Find Leaves of Binary Tree	Python	Medium
651	Binary Tree Vertical Order Traversal	JavaScript	Medium
652	Factorization		Medium
653	Expression Add Operators		Hard
654	Sparse Matrix Multiplication		Medium
655	Add Strings	JavaScript	Easy
656	Multiply Strings		Medium
657	Insert Delete GetRandom O(1)		Medium
658	Swap Without Extra Variable (Only C++)		Easy
659	Encode and Decode Strings	Python	Medium
660	Read N Characters Given Read4 II - Call multiple times		Hard
661	Convert BST to Greater Tree	JavaScript	Easy
662	Guess Number Higher or Lower	Python	Easy
663	Walls and Gates		Medium
664	Counting Bits	JavaScript	Medium
665	Range Sum Query 2D - Immutable	Python	Medium
666	Guess Number Higher or Lower II		Medium
667	Longest Palindromic Subsequence		Medium
668	Ones and Zeroes		Medium
669	Coin Change	JavaScript	Medium
671	Rotate Words	Python	Easy
676	Decode Ways II		Hard
677	Number of Big Islands	TypeScript	Medium
678	Shortest Palindrome		Medium
679	Unique Paths III		Hard
680	Split String	Python	Medium
681	First Missing Prime Number		Medium
683	Word Break III		Medium
684	Missing String	JavaScript	Easy
685	First Unique Number in Data Stream	JavaScript	Medium
686	Remove Arbitrary Space	JavaScript	Easy
688	The Number In Words		Medium
689	Two Sum IV - Input is a BST	Python	Medium
690	Factorial		Hard
691	Recover Binary Search Tree	JavaScript	Medium
692	Sliding Window Unique Elements Sum	JavaScript	Medium
693	Remove Digits		Medium
696	Course Schedule III		Hard
697	Sum of Square Numbers	JavaScript	Easy
698	Maximum Distance in Arrays		Medium
699	Check Sum of K Primes		Hard
700	Cutting a Rod	JavaScript	Medium
701	Trim a Binary Search Tree	JavaScript	Medium
702	Concatenated String with Uncommon Characters of Two Strings	JavaScript	Easy
703	Folding Array		Hard
704	Bulb Switcher II		Medium
706	Binary Watch	TypeScript	Medium
707	Optimal Account Balancing		Super
708	Elevator system - OO Design		Hard
709	Restaurant OO Design		Hard
712	Vending machine OO Design		Hard
714	Black Jack OO Design		Medium
716	Add and Search	TypeScript	Easy
717	Tree Longest Path With Same Value		Medium
718	Repeat String		Medium
719	Calculate Maximum Value		Medium
720	Rearrange a String With Integers	JavaScript	Easy
721	Next Sparse Number		Hard
722	Maximum Subarray VI		Super
723	Rotate Bits - Left	TypeScript	Medium
724	Minimum Partition		Medium
725	Boolean Parenthesization		Hard
726	Check Full Binary Tree	JavaScript	Medium
727	Chinese Remainder Theorem		Hard
728	Three Distinct Factors	TypeScript	Medium
729	Last Digit By Factorial Divide		Medium
730	Sum of All Subsets	JavaScript	Easy
731	Restaurant II OO Design		Hard
732	Hotel II OO Design		Hard
734	Number of Subsequences of Form a^i b^j c^k		Medium
735	Replace With Greatest From Right	Python	Medium
737	Find Elements in Matrix	JavaScript	Easy
738	Count Different Palindromic Subsequences		Hard
739	24 Game		Hard
740	Coin Change 2	JavaScript	Medium
741	Calculate Maximum Value II		Medium
742	Self Dividing Numbers		Medium
743	Monotone Increasing Digits		Medium
744	Sum of first K even-length Palindrome numbers		Medium
745	Palindromic Ranges		Medium
746	Design Tic-Tac-Toe		Hard
747	Coffee Maker OO Design		Medium
748	Kindle OO Design		Medium
749	John's backyard garden	JavaScript	Easy
750	Portal		Medium
751	John's business		Medium
752	Rogue Knight Sven		Medium
756	Multiply Two Numbers	JavaScript	Easy
757	Shortest Unordered Array	TypeScript	Easy
759	Time Angle	JavaScript	Easy
760	Binary Tree Right Side View	JavaScript	Medium
761	Smallest Subset	JavaScript	Medium
762	Longest Common Subsequence II		Hard
763	Hex Conversion	JavaScript	Easy
764	Calculate Circumference And Area	Python	Easy
765	Valid Triangle	JavaScript	Easy
766	Leap Year	JavaScript	Easy
767	Reverse Array	JavaScript	Easy
768	Yang Hui Triangle	JavaScript	Easy
770	Maximum and Minimum	JavaScript	Easy
771	Double Factorial		Easy
772	Group Anagrams		Medium
773	Valid Anagrams	JavaScript	Easy
774	Repeated DNA	JavaScript	Medium
775	Palindrome Pairs		Hard
776	Strobogrammatic Number II	TypeScript	Medium
777	Valid Perfect Square	JavaScript	Easy
778	Pacific Atlantic Water Flow	Python	Medium
779	Generalized Abbreviation	TypeScript	Medium
780	Remove Invalid Parentheses		Hard
782	AND and OR	TypeScript	Medium
783	Minimum Risk Path		Hard
784	The Longest Common Prefix II		Easy
785	Maximum Weighted Sum Path	JavaScript	Medium
786	Linked List Weighted Sum In Reverse Order		Easy
787	The Maze		Medium
788	The Maze II		Medium
789	The Maze III		Hard
790	Parser		Medium
791	Merge Number	JavaScript	Medium
792	Kth Prime Number	TypeScript	Easy
793	Intersection of Arrays		Medium
794	Sliding Puzzle II		Hard
795	4-Way Unique Paths		Medium
796	Open the Lock		Hard
797	Reach a Number		Easy
798	Backpack VII		Medium
799	Backpack VIII		Medium
800	Backpack IX	JavaScript	Medium
801	Backpack X		Medium
802	Sudoku Solver		Hard
803	Shortest Distance from All Buildings		Hard
804	Number of Distinct Islands II		Hard
805	Maximum Association Set		Medium
806	Buy Fruits		Medium
807	Palindrome Number II		Easy
808	Movie Network		Medium
809	K-th Symbol in Grammar		Medium
810	Swim in Rising Water		Hard
811	Swap Adjacent in LR String		Medium
812	Bold Words in String	TypeScript	Easy
813	Find Anagram Mappings	JavaScript	Easy
814	Shortest Path in Undirected Graph		Medium
815	Course Schedule IV		Hard
816	Traveling Salesman Problem		Hard
817	Range Sum Query 2D - Mutable		Medium
818	Subset With Target		Hard
819	Word Sorting		Medium
820	Rectangle		Medium
821	Time Intersection		Medium
822	Reverse Order Storage	JavaScript	Easy
823	Input Stream	JavaScript	Easy
824	Single Number IV	JavaScript	Medium
825	Bus Station		Hard
826	Computer Maintenance		Hard
828	Word Pattern	JavaScript	Easy
829	Word Pattern II		Hard
830	String Sort		Easy
831	3Sum II		Medium
832	Count Negative Number		Medium
833	Process Sequence		Medium
834	Remove Duplicate Letters	JavaScript	Medium
835	Hamming Distance	JavaScript TypeScript	Easy
836	Partition to K Equal Sum Subsets		Hard
837	Palindromic Substrings	JavaScript	Medium
838	Subarray Sum Equals K	JavaScript	Easy
839	Merge Two Sorted Interval Lists	TypeScript	Easy
840	Range Sum Query - Mutable	Python	Medium
841	String Replace		Hard
842	Origami		Medium
843	Digital Flip	JavaScript	Medium
844	Number Pair Statistics		Easy
845	Greatest Common Divisor	JavaScript	Easy
846	Multi-keyword Sort	JavaScript	Easy
847	Split BST		Medium
848	Minimize Max Distance to Gas Station		Hard
849	Basic Calculator III		Hard
850	Employee Free Time		Hard
851	Pour Water		Medium
852	IP to CIDR		Easy
853	Number Of Corner Rectangles		Medium
854	Closest Leaf in a Binary Tree	JavaScript	Medium
855	Sentence Similarity II		Medium
856	Sentence Similarity	JavaScript	Easy
857	Minimum Window Subsequence		Hard
858	Candy Crush		Medium
859	Max Stack	Python	Hard
860	Number of Distinct Islands		Medium
861	K Empty Slots		Hard
862	Next Closest Time	TypeScript	Medium
863	Binary Tree Path Sum IV	TypeScript	Medium
864	Equal Tree Partition	JavaScript	Medium
865	Remove 9		Hard
866	Coin Path		Hard
867	4 Keys Keyboard		Medium
868	Maximum Average Subarray	JavaScript	Easy
869	Find the Derangement of An Array		Medium
871	Minimum Factorization		Medium
872	Kill Process	Python	Medium
873	Squirrel Simulation		Medium
874	Maximum Vacation Days		Hard
875	Longest Line of Consecutive One in Matrix	JavaScript	Medium
876	Split Concatenated Strings		Medium
877	Split Array with Equal Sum		Medium
878	Boundary of Binary Tree		Medium
879	Output Contest Matches		Medium
880	Construct Binary Tree from String	JavaScript	Medium
881	Lonely Pixel II		Medium
882	Lonely Pixel	TypeScript	Medium
883	Max Consecutive Ones II	JavaScript	Medium
884	Find Permutation		Medium
885	Encode String with Shortest Length		Hard
886	Convex Polygon		Medium
887	Ternary Expression Parser		Medium
888	Valid Word Square	JavaScript	Easy
889	Sentence Screen Fitting		Medium
890	Minimum Unique Word Abbreviation		Hard
891	Valid Palindrome II	JavaScript	Medium
892	Alien Dictionary	JavaScript	Hard
893	Longest Palindromic Substring II		Hard
894	Pancake Sorting		Medium
895	Friend Request		Easy
896	Prime Product		Medium
897	Island City		Medium
898	Leftmost One		Medium
900	Closest Binary Search Tree Value	JavaScript	Easy
901	Closest Binary Search Tree Value II		Hard
902	Kth Smallest Element in a BST	JavaScript	Medium
903	Range Addition	TypeScript	Medium
904	Plus One Linked List	JavaScript	Medium
905	Nested List Weight Sum II		Medium
906	Sort Transformed Array	JavaScript	Medium
907	Rearrange String k Distance Apart		Hard
908	Line Reflection	JavaScript	Medium
909	Android Unlock Patterns		Medium
910	Largest BST Subtree		Medium
911	Maximum Size Subarray Sum Equals k	JavaScript	Medium
912	Best Meeting Point		Hard
913	Flip Game II		Medium
914	Flip Game	JavaScript	Easy
915	Inorder Predecessor in BST	Java	Medium
916	Palindrome Permutation	JavaScript	Easy
917	Palindrome Permutation II		Medium
918	3Sum Smaller	JavaScript	Medium
919	Meeting Rooms II		Medium
920	Meeting Rooms	JavaScript	Easy
921	Count Univalue Subtrees	TypeScript	Medium
922	Group Shifted Strings		Medium
923	Strobogrammatic Number III		Hard
924	Shortest Word Distance	JavaScript	Easy
925	Shortest Word Distance II		Medium
926	Shortest Word Distance III		Medium
927	Reverse Words in a String II	JavaScript	Medium
928	Longest Substring with At Most Two Distinct Characters		Medium
930	Connected Components in List		Medium
931	Median of K Sorted Arrays		Hard
932	Friends Within Three Jumps		Medium
933	Tuple Multiply		Medium
934	Unlock Problem		Medium
935	Cartesian Product		Medium
936	Capitalizes The First Letter	JavaScript	Easy
937	How Many Problem Can I Accept	TypeScript	Medium
939	Binary Tree Kth Floor Node		Medium
940	Maximum Absolute Value		Medium
941	Sliding Puzzle		Hard
943	Range Sum Query - Immutable	Python	Easy
944	Maximum Submatrix		Medium
945	Task Scheduler		Medium
946	233 Matrix		Super
947	Matrix Power Series		Hard
948	Sequence Count		Super
949	Fibonacci II		Medium
950	Sliding Puzzle III		Hard
951	Rearrange		Easy
952	Digital Problem		Easy
953	The Biggest Score On The Tree		Medium
954	Insert Delete GetRandom O(1) - Duplicates allowed		Hard
955	Implement Queue by Circular Array	Python	Medium
956	Data Segmentation		Easy
957	Radar Detection		Easy
958	Palindrome Data Stream		Easy
959	K Spaced Array Sorting		Medium
960	First Unique Number in Data Stream II	Python	Medium
961	Design Log Storage System		Medium
962	Condition string		Medium
963	The Judges Give Problem		Medium
964	Food Set	TypeScript	Medium
965	LR String		Medium
966	Closest Pair of Points		Hard
967	Quality Inspection		Hard
968	Valid Currency Amount		Medium
969	Longest Repeating Substring II		Medium
970	Big Business		Easy
971	Surplus Value Backpack		Hard
972	Deliver The Message		Medium
973	1-bit and 2-bit Characters	JavaScript	Easy
974	01 Matrix	JavaScript	Medium
975	2 Keys Keyboard		Medium
976	4Sum II	JavaScript	Medium
977	Base 7	JavaScript	Easy
978	Basic Calculator		Medium
979	Additive Number	TypeScript	Medium
980	Basic Calculator II		Medium
981	Basic Calculator IV		Hard
982	Arithmetic Slices	JavaScript	Medium
983	Baseball Game	JavaScript	Easy
984	Arithmetic Slices II - Subsequence		Hard
985	Can I Win		Hard
986	Battleships in a Board	Python	Medium
987	Binary Number with Alternating Bits	JavaScript	Easy
988	Arranging Coins	JavaScript	Easy
989	Array Nesting	TypeScript	Medium
990	Beautiful Arrangement		Medium
991	Bulb Switcher		Medium
992	Beautiful Arrangement II		Medium
993	Array Partition I	JavaScript	Easy
994	Contiguous Array	JavaScript	Medium
995	Best Time to Buy and Sell Stock with Cooldown	JavaScript	Medium
996	Maximum Slope Straight Line		Medium
997	Print Organization Chart		Medium
998	Construction Queue		Hard
999	implement-deque-by-circular-array		Medium
1000	Best Time to Buy and Sell Stock with Transaction Fee	JavaScript	Medium
1001	Asteroid Collision	JavaScript	Medium
1002	Bus Routes		Medium
1003	Binary Tree Pruning	JavaScript	Easy
1004	Largest Sum of Averages	JavaScript	Medium
1005	Largest Triangle Area	JavaScript	Easy
1006	Subdomain Visit Count	JavaScript	Easy
1007	Chalkboard XOR Game		Medium
1008	Expressive Words		Medium
1009	Soup Servings		Medium
1010	Max Increase to Keep City Skyline	JavaScript	Medium
1011	Number of Lines To Write String	JavaScript	Easy
1012	Split Array With Same Average		Hard
1013	Unique Morse Code Words	JavaScript	Easy
1014	Bricks Falling When Hit		Hard
1015	Find Eventual Safe States		Medium
1016	Minimum Swaps To Make Sequences Increasing		Medium
1017	Similar RGB Color	JavaScript	Easy
1018	Champagne Tower	JavaScript	Medium
1019	Smallest Rotation with Highest Score		Hard
1020	All Paths From Source to Target	TypeScript	Medium
1021	Number of Subarrays with Bounded Maximum		Medium
1022	Valid Tic-Tac-Toe State	JavaScript	Medium
1023	Preimage Size of Factorial Zeroes Function	TypeScript	Hard
1024	Number of Matching Subsequences		Medium
1025	Custom Sort String		Medium
1026	Domino and Tromino Tiling		Medium
1027	Escape The Ghosts	JavaScript	Medium
1028	Rotated Digits	TypeScript	Easy
1029	Cheapest Flights Within K Stops		Medium
1030	K-th Smallest Prime Fraction		Hard
1031	Is Graph Bipartite?	TypeScript	Medium
1032	Letter Case Permutation	JavaScript	Easy
1033	Minimum Difference Between BST Nodes	JavaScript	Easy
1034	Transform to Chessboard		Hard
1035	Rabbits in Forest	JavaScript	Medium
1036	Reach Points		Hard
1037	Global and Local Inversions		Medium
1038	Jewels And Stones	JavaScript	Easy
1039	Max Chunks To Make Sorted	TypeScript	Medium
1040	Max Chunks To Make Sorted II		Hard
1041	Reorganize String	JavaScript	Medium
1042	Toeplitz Matrix	JavaScript	Easy
1043	Couples Holding Hands		Hard
1044	Largest Plus Sign	TypeScript	Medium
1045	Partition Labels		Medium
1046	Prime Number of Set Bits in Binary Representation	TypeScript	Easy
1047	Special Binary String		Medium
1048	Set Intersection Size At Least Two		Hard
1049	Pyramid Transition Matrix		Medium
1050	Cracking the Safe		Hard
1051	Contain Virus		Hard
1052	Shortest Completing Word		Medium
1053	Largest Number At Least Twice of Others	JavaScript	Easy
1054	Min Cost Climbing Stairs	JavaScript	Easy
1056	Find Smallest Letter Greater Than Target	JavaScript	Easy
1057	Network Delay Time		Medium
1058	Cherry Pickup		Hard
1059	Delete and Earn	JavaScript	Medium
1060	Daily Temperatures	Python	Medium
1061	Parse Lisp Expression		Hard
1062	Flood Fill	JavaScript	Easy
1063	My Calendar III		Hard
1064	My Calendar II		Medium
1065	My Calendar I		Medium
1066	Verify Preorder Serialization of a Binary Tree	JavaScript	Medium
1067	Split Array in Parts		Medium
1068	Find Pivot Index	JavaScript	Easy
1069	Remove Comments		Medium
1070	Accounts Merge		Medium
1071	Longest Word in Dictionary	TypeScript	Easy
1072	Find K-th Smallest Pair Distance		Hard
1073	Maximum Length of Repeated Subarray		Medium
1074	Range Module		Hard
1075	Subarray Product Less Than K		Medium
1076	Minimum ASCII Delete Sum for Two Strings	JavaScript	Medium
1077	Falling Squares		Hard
1078	Degree of an Array	TypeScript	Easy
1079	Count Binary Substrings	TypeScript	Easy
1080	Max Area of Island	JavaScript	Easy
1081	Stickers to Spell Word		Hard
1082	Employee Importance	Python	Easy
1083	Maximum Sum of 3 Non-Overlapping Subarrays		Hard
1084	Knight Probability in Chessboard		Medium
1085	Longest Univalue Path	JavaScript	Easy
1086	Repeated String Match	TypeScript	Easy
1087	Redundant Connection II		Hard
1088	Redundant Connection		Medium
1089	Valid Parenthesis String	JavaScript	Medium
1090	Map Sum Pairs		Medium
1092	Cut Off Trees for Golf Event		Hard
1093	Number of Longest Increasing Subsequence	JavaScript	Medium
1094	Second Minimum Node In a Binary Tree	JavaScript	Easy
1095	Maximum Swap	JavaScript	Medium
1096	Greatest Least Common Multiple		Medium
1097	Kth Smallest Number in Multiplication Table		Hard
1098	Path Sum IV	TypeScript	Medium
1099	Non-decreasing Array	JavaScript	Easy
1100	Strange Printer		Hard
1101	Maximum Width of Binary Tree	JavaScript	Medium
1102	Image Smoother	TypeScript	Easy
1103	Split Array into Consecutive Subsequences		Medium
1104	Judge Route Circle	TypeScript	Easy
1105	Print Binary Tree	JavaScript	Medium
1106	Maximum Binary Tree	JavaScript	Easy
1109	Dota2 Senate		Medium
1110	Replace Words	TypeScript	Medium
1111	Maximum Length of Pair Chain		Medium
1112	Set Mismatch	JavaScript	Easy
1113	Solve the Equation		Medium
1114	Shopping Offers		Medium
1115	Average of Levels in Binary Tree	JavaScript	Easy
1116	Exclusive Time of Functions		Medium
1117	Smallest Range		Hard
1118	K Inverse Pairs Array		Hard
1122	Add One Row to Tree	JavaScript	Medium
1125	Jump Pillar		Medium
1126	Merge Two Binary Trees	JavaScript	Easy
1127	Add Bold Tag in String		Medium
1129	Smallest Subtree with All the Deepest Nodes	TypeScript	Medium
1130	Magic circle		Hard
1131	The Function in Permutations		Medium
1132	Valid Triangle Number	TypeScript	Medium
1133	Group Buy	TypeScript	Easy
1134	Find Duplicate File in System	JavaScript	Medium
1135	Feature extraction		Easy
1136	High Click Induction Area	TypeScript	Medium
1137	Construct String from Binary Tree	JavaScript	Easy
1138	Can Place Flowers	JavaScript	Easy
1139	the kth subarray		Hard
1141	The month's days	TypeScript	Easy
1142	Non-negative Integers without Consecutive Ones		Hard
1143	Minimum Index Sum of Two Lists	JavaScript	Easy
1144	Range Addition II	TypeScript	Easy
1145	Associated query		Easy
1146	Chess piece rotation		Easy
1147	Work Plan		Medium
1148	Longest Harmonious Subsequence	TypeScript	Easy
1149	Valid Square	JavaScript	Medium
1150	Fraction Addition and Subtraction		Medium
1151	Tag Validator		Hard
1152	Erect the Fence		Hard
1153	string sorting	TypeScript	Easy
1154	Attendance Judgment	TypeScript	Easy
1156	Delete Operation for Two Strings	JavaScript	Medium
1157	Shortest Unsorted Continuous Subarray	TypeScript	Easy
1158	Plant flowers		Medium
1159	Longest Common Prefix III		Hard
1160	Campus Bikes		Medium
1161	goods transfer		Hard
1162	Out of Boundary Paths		Medium
1163	Distribute Candies	JavaScript	Easy
1164	Wiggle Subsequence		Medium
1165	Subtree of Another Tree	JavaScript	Easy
1166	Recommended Results are Scattered	TypeScript	Easy
1167	Top three numbers		Medium
1168	array score	TypeScript	Easy
1169	Permutation in String	JavaScript	Medium
1170	Reshape the Matrix	JavaScript	Easy
1171	Find the Closest Palindrome		Hard
1172	Binary Tree Tilt	JavaScript	Easy
1173	Reverse Words in a String III	JavaScript	Easy
1174	Next Greater Element III		Medium
1175	Brick Wall		Medium
1176	Optimal Division		Medium
1177	Student Attendance Record II		Hard
1178	Student Attendance Record I	JavaScript	Easy
1179	Friend Circles		Medium
1180	Remove Boxes		Hard
1181	Diameter of Binary Tree	JavaScript	Easy
1182	Reverse String II	JavaScript	Easy
1183	Single Element in a Sorted Array	JavaScript	Medium
1184	Minimum Time Difference	JavaScript	Medium
1185	Complex Number Multiplication	JavaScript	Medium
1186	Encode and Decode TinyURL	Python	Medium
1187	K-diff Pairs in an Array	JavaScript	Easy
1188	Minimum Absolute Difference in BST	JavaScript	Easy
1189	Minesweeper	Python	Medium
1190	Longest Word in Dictionary through Deleting		Medium
1191	Longest Uncommon Subsequence II		Medium
1192	Longest Uncommon Subsequence I	TypeScript	Easy
1193	Detect Capital	JavaScript	Easy
1194	Super Washing Machines		Hard
1195	Find Largest Value in Each Tree Row	JavaScript	Medium
1196	Freedom Trail		Hard
1197	Find Bottom Left Tree Value	JavaScript	Medium
1198	Most Frequent Subtree Sum	TypeScript	Medium
1199	Perfect Number	TypeScript	Easy
1200	Relative Ranks	JavaScript	Easy
1201	Next Greater Element II		Medium
1202	IPO	TypeScript	Hard
1203	Find Mode in Binary Search Tree	JavaScript	Medium
1204	Keyboard Row	JavaScript	Easy
1205	Diagonal Traverse	JavaScript	Medium
1206	Next Greater Element I	TypeScript	Easy
1207	Teemo Attacking		Medium
1208	Target Sum	JavaScript	Medium
1209	Construct the Rectangle	JavaScript	Easy
1210	Increasing Subsequences		Medium
1211	Zuma Game		Hard
1212	Max Consecutive Ones	JavaScript	Easy
1213	Smallest Good Base		Hard
1214	License Key Formatting	JavaScript	Easy
1215	Magical String	TypeScript	Medium
1216	Largest Palindrome Product	TypeScript	Easy
1217	Total Hamming Distance	TypeScript	Medium
1218	Number Complement	JavaScript	Easy
1219	Heaters	TypeScript	Medium
1220	Matchsticks to Square	TypeScript	Medium
1221	Concatenated Words		Hard
1222	Validate IP Address	TypeScript	Medium
1223	Unique Substrings in Wraparound String		Medium
1224	Count The Repetitions		Hard
1225	Island Perimeter	TypeScript	Easy
1226	Minimum Moves to Equal Array Elements II	TypeScript	Medium
1227	Repeated Substring Pattern	JavaScript	Easy
1228	Poor Pigs		Easy
1229	Circular Array Loop		Medium
1230	Assign Cookies	JavaScript	Easy
1231	Minimum Moves to Equal Array Elements		Easy
1232	Minimum Number of Arrows to Burst Balloons		Medium
1233	Sort Characters By Frequency	TypeScript	Medium
1234	Delete Node in a BST		Medium
1235	Serialize and Deserialize BST	Python	Medium
1236	Find All Numbers Disappeared in an Array	JavaScript	Easy
1237	Number of Boomerangs	JavaScript	Easy
1238	Find All Duplicates in an Array	Python	Medium
1239	K-th Smallest in Lexicographical Order		Hard
1240	Path Sum III		Easy
1241	Find Right Interval		Medium
1242	Non-overlapping Intervals		Medium
1243	Number of Segments in a String	JavaScript	Easy
1244	Minimum Genetic Mutation		Medium
1245	All O(1) Data Structure		Hard
1246	Longest Repeating Character Replacement		Medium
1247	Reconstruct Original Digits from English	TypeScript	Medium
1248	Maximum XOR of Two Numbers in an Array		Medium
1249	Strong Password Checker		Hard
1250	Third Maximum Number	JavaScript	Easy
1251	Split Array Largest Sum	JavaScript	Hard
1252	Queue Reconstruction by Height		Medium
1253	Convert a Number to Hexadecimal	JavaScript	Easy
1254	Sum of Left Leaves	JavaScript	Easy
1255	Remove K Digits		Medium
1256	Nth Digit		Easy
1257	Evaluate Division		Medium
1258	Beautiful Subarrays		Medium
1259	Integer Replacement	TypeScript	Medium
1260	Rotate Function		Medium
1261	Longest Substring with At Least K Repeating Characters		Medium
1262	UTF-8 Validation	TypeScript	Medium
1263	Is Subsequence	JavaScript	Medium
1264	Perfect Rectangle		Hard
1265	Elimination Game		Medium
1266	Find the Difference	JavaScript	Easy
1267	Lexicographical Numbers	JavaScript	Medium
1269	Handkerchief Throwing		Medium
1270	Ransom Note	JavaScript	Easy
1271	Critical Connections in a Network		Hard
1272	Kth Smallest Element in a Sorted Matrix	JavaScript	Medium
1273	Maximum Length of Increasing String		Hard
1274	Find K Pairs with Smallest Sums		Medium
1275	Super Pow	JavaScript	Medium
1276	Sum of Two Integers		Easy
1277	Water and Jug Problem		Medium
1278	Max Sum of Rectangle No Larger Than K		Hard
1279	Count Numbers with Unique Digits		Medium
1280	Data Stream as Disjoint Intervals		Hard
1281	Top K Frequent Elements	Python	Medium
1282	Reverse Vowels of a String	JavaScript	Easy
1283	Reverse String	JavaScript	Easy
1284	Integer Break	JavaScript	Medium
1285	Power of Four	JavaScript	Easy
1286	Self Crossing		Hard
1287	Increasing Triplet Subsequence	JavaScript	Medium
1288	Reconstruct Itinerary		Medium
1289	Number of Atoms		Hard
1290	Patching Array		Hard
1291	Sports Meeting		Medium
1292	Odd Even Linked List	JavaScript	Medium
1293	Count of Range Sum		Hard
1294	Power of Three	JavaScript	Easy
1295	Prime Factor Statistics		Easy
1296	Maximum Product of Word Lengths	TypeScript	Medium
1297	Count of Smaller Numbers After Self	TypeScript	Hard
1298	Minimum Height Trees		Medium
1299	Bulls and Cows	TypeScript	Medium
1300	Bash Game	JavaScript	Easy
1301	Game of Life		Medium
1302	People Counting		Easy
1303	H-Index II	JavaScript	Medium
1304	H-Index		Medium
1306	Travel Plan II		Hard
1307	Verify Preorder Sequence in Binary Search Tree	JavaScript	Medium
1308	Factor Combinations		Medium
1309	Different Ways to Add Parentheses		Medium
1310	Product of Array Except Self	JavaScript	Medium
1311	Lowest Common Ancestor of a Binary Search Tree	Python	Easy
1312	Number of Digit One	JavaScript	Hard
1313	Bipartite Graph		Medium
1314	Power of Two	JavaScript	Easy
1315	Summary Ranges		Medium
1316	Luck Number		Hard
1317	Count Complete Tree Nodes	JavaScript	Medium
1318	Contains Duplicate III		Medium
1319	Contains Duplicate II	JavaScript	Easy
1320	Contains Duplicate	JavaScript	Easy
1321	Combination Sum III		Medium
1322	Product Equal B		Hard
1323	Fetch supplies		Medium
1324	Count Primes	JavaScript	Easy
1325	Bitwise AND of Numbers Range	TypeScript	Medium
1326	Boarder Sort	TypeScript	Medium
1327	delete string		Easy
1328	Double Change		Easy
1329	Sequence maintenance		Hard
1330	zero matrix		Hard
1331	English Software	TypeScript	Easy
1332	Number of 1 Bits	JavaScript	Easy
1333	Reverse Bits	JavaScript Python	Easy
1334	Rotate Array	JavaScript	Easy
1335	Repeated DNA Sequences	JavaScript	Medium
1336	Party Invitation		Medium
1337	Maximum possible value		Medium
1338	Parking Dilemma	TypeScript	Easy
1339	Maximum Range		Hard
1340	add character		Easy
1341	Combine New Numbers		Medium
1342	substitute string		Medium
1343	Sum of Two Strings	Python	Easy
1344	Counter Diagonal Sort	TypeScript	Medium
1345	Robot Encircular		Medium
1346	Dungeon Game		Hard
1347	Factorial Trailing Zeroes	JavaScript	Easy
1348	Excel Sheet Column Number	JavaScript	Easy
1350	Excel Sheet Column Title	JavaScript	Easy
1351	Fraction to Recurring Decimal		Medium
1352	Compare Version Numbers	JavaScript	Medium
1353	Sum Root to Leaf Numbers	JavaScript	Medium
1354	Pascal's Triangle II	JavaScript	Easy
1355	Pascal's Triangle	JavaScript	Easy
1356	Maximum Points Set		Medium
1357	Path Sum II	JavaScript	Medium
1358	Path Sum	JavaScript	Easy
1359	Convert Sorted Array to Binary Search Tree	JavaScript	Easy
1360	Symmetric Tree	JavaScript	Medium
1361	Text Justification		Hard
1362	Substring with Concatenation of All Words		Hard
1363	ZigZag Conversion	TypeScript	Medium
1364	the minium distance		Medium
1365	Minimum Cycle Section		Hard
1366	Directed Graph Loop		Medium
1367	Police Distance		Medium
1368	Same Number	JavaScript	Easy
1369	Most Common Word	TypeScript	Easy
1370	Race Car		Hard
1371	Linked List Components	JavaScript	Medium
1372	Ambiguous Coordinates	TypeScript	Medium
1373	Movies on Flight		Medium
1374	Shortest Distance in 3D Space		Medium
1375	Substring With At Least K Distinct Characters		Medium
1376	Equivalent Strings		Medium
1377	Find Substring		Medium
1378	Minimum String Array Coverage		Medium
1379	The Longest Scene		Hard
1380	Log Sorting		Easy
1381	Maximum Line Coverage		Hard
1382	High Capacity Backpack		Hard
1383	Subtree Count		Hard
1384	Segment Stones Merge		Super
1385	Lucky Number Eight		Easy
1386	Cable Car Ride		Easy
1387	Binary Trees With Factors		Medium
1388	Card Flipping Game		Medium
1389	Shortest Distance to a Character		Easy
1390	Short Encoding of Words		Medium
1391	Making A Large Island		Hard
1392	Most Profit Assigning Work		Medium
1393	Friends Of Appropriate Ages	TypeScript	Medium
1394	Goat Latin	JavaScript	Easy
1395	The Barycentre Of The Trees		Hard
1396	Set Union		Medium
1397	Digital Coverage		Medium
1398	K Decimal Addition		Easy
1399	Take Coins		Medium
1400	Fermat Point Of Graphs		Hard
1401	Twitch Words	JavaScript	Easy
1402	Recommend Friends		Medium
1403	Maximum Product Path		Medium
1408	Gas Station II		Hard
1409	Matrix Finding Number		Medium
1410	Matrix Water Injection		Medium
1411	Edit Distance - Replace Edition		Medium
1412	Pick Three Numbers		Medium
1413	Tree		Medium
1414	Eat The Beans		Hard
1415	Residual Product		Easy
1416	The Previous Number		Medium
1417	Weighing Problem		Easy
1418	Path With Maximum Minimum Value		Medium
1420	Minimum Window Substring II		Medium
1421	Matrix Game		Easy
1422	Shortest Path Visiting All Nodes		Hard
1423	Hand of Straights		Medium
1424	Longest Mountain in Array	JavaScript	Medium
1425	Backspace String Compare	JavaScript	Easy
1426	Robot jumping		Hard
1427	Split Array into Fibonacci Sequence		Medium
1428	Keys and Rooms		Medium
1430	Similar String Groups		Hard
1431	Push Dominoes		Medium
1432	New 21 Game		Medium
1433	Image Overlap		Medium
1434	Sum of Distances in Tree		Hard
1435	Find And Replace in String		Medium
1436	Flipping an Image		Easy
1437	Masking Personal Information	TypeScript	Medium
1438	Positions of Large Groups	JavaScript	Easy
1439	Consecutive Numbers Sum	TypeScript	Medium
1440	Unique Letter String		Hard
1441	Four Numbers Multiply Problem		Hard
1442	Order Problem		Medium
1443	Longest AB Substring		Easy
1444	Dyeing Problem		Medium
1446	01 Matrix Walking Problem		Medium
1447	Calculation The Sum Of Path		Medium
1448	Card Game		Medium
1449	Loud and Rich		Medium
1450	Rectangle Area II		Hard
1451	Maximize Distance to Closest Person	JavaScript	Easy
1452	Shifting Letters		Medium
1453	Minimum Amount		Medium
1454	Word Frequency Count		Medium
1455	Valid Array		Easy
1456	Word Synthesis Problem		Hard
1457	Search Subarray	TypeScript	Medium
1458	Minimum Submatrix		Medium
1459	Judge the last number		Easy
1463	Paper Review		Medium
1464	The K-th Combination		Hard
1465	Order Of Tasks		Medium
1466	Best Shopping Plan		Medium
1467	Ask For Cooling Time		Medium
1468	Two Numbers That Are Not Repeated		Hard
1469	Longest Path On The Tree		Medium
1470	The Game Of Take Numbers		Medium
1471	Set Operation		Easy
1472	Twins Strings		Easy
1473	Find The Sum Of The Array		Medium
1474	Shortest Phrase		Medium
1475	Minimum Legal Bracket Sequence		Hard
1476	Peak Index in a Mountain Array	TypeScript	Easy
1477	Car Fleet	JavaScript	Medium
1478	Closest Target Value		Easy
1479	Can Reach The Endpoint		Easy
1480	Dot Product		Easy
1481	Unique Substring		Medium
1482	Minimum Sum Path		Medium
1483	Maximum Average Score	JavaScript	Easy
1484	The Most Frequent word		Medium
1486	Function Runtime		Easy
1487	Judging Triangle		Medium
1489	The Largest Sum Of The Matrix Boundary Elements		Medium
1490	K-Similar Strings		Hard
1491	Score of Parentheses		Medium
1492	Koko Eating Bananas	JavaScript	Medium
1493	Walking Robot Simulation		Easy
1494	Length of Longest Fibonacci Subsequence		Medium
1495	Leaf-Similar Trees	JavaScript	Easy
1496	Implement Rand10() Using Rand7()	Python	Medium
1497	Minimum Number of Refueling Stops		Hard
1498	Advantage Shuffle		Medium
1499	Reordered Power of 2	JavaScript	Medium
1500	Binary Gap		Easy
1501	Transpose Matrix		Easy
1502	Prime Palindrome		Medium
1503	Give change		Easy
1504	Shortest Path to Get All Keys		Hard
1505	Find the Number	Python	Easy
1506	All Nodes Distance K in Binary Tree	Python	Medium
1507	Shortest Subarray with Sum at Least K		Hard
1508	Score After Flipping Matrix	JavaScript	Medium
1509	Lemonade Change	JavaScript	Easy
1510	Buddy Strings	JavaScript	Easy
1511	Mirror Reflection		Medium
1512	Minimum Cost to Hire K Workers		Hard
1513	Exam Room		Medium
1514	Robot Room Cleaner		Hard
1516	Xor Sum		Super
1517	Largest subarray	JavaScript	Easy
1518	Watering Flowers		Medium
1521	Unique Twitter User Id Set		Easy
1522	Search in a Sorted Array of Unknown Size		Medium
1523	Partitioning Array	TypeScript	Easy
1524	Search in a Binary Search Tree	JavaScript	Easy
1525	N-ary Tree Postorder Traversal	Python	Easy
1526	N-ary Tree Preorder Traversal	Python	Easy
1527	Majsoul on !		Medium
1528	number schemes		Hard
1529	Triplet Subarray With Absolute Diff Less Than or Equal to Limit		Medium
1530	Encode N-ary Tree to Binary Tree		Hard
1531	Automatic Proofreading Program		Medium
1532	Serialize and Deserialize N-ary Tree		Hard
1533	N-ary Tree Level Order Traversal	TypeScript	Easy
1534	Convert Binary Search Tree to Sorted Doubly Linked List		Medium
1535	To Lower Case	JavaScript	Easy
1536	Find First and Last Position of Element in Sorted Array	JavaScript	Medium
1537	Swap Zero-One		Medium
1538	Card Game II		Medium
1539	Flipped the Pixel		Medium
1540	Can Convert	TypeScript	Easy
1541	Put Box		Medium
1542	NextTime Norepeat		Medium
1543	Unique Path IV		Medium
1544	Magic Square		Hard
1545	Last Closest Time		Medium
1546	Coin Problem		Easy
1552	Parking Problem		Medium
1553	Climbing Stairs III		Medium
1554	LastTime Norepeat		Medium
1555	Flower Problem		Hard
1556	Guess Game		Hard
1557	Array Maximum Value		Hard
1558	Interlaced Positive And Negative Numbers		Hard
1559	Take the element and query the sum		Easy
1560	MinimumString		Medium
1561	BST Node Distance		Medium
1562	Number of restaurants		Medium
1563	Shortest path to the destination		Medium
1564	Interval Search		Easy
1565	Modern Ludo I		Medium
1566	Minimum Difference		Hard
1567	Maximum Can Exchanged Subarray		Medium
1568	Poison Test		Medium
1569	Social Network		Medium
1570	Binary Stream		Easy
1571	Top K GPA		Medium
1572	Asking For The Longest 01 Substring		Medium
1573	Legal String		Medium
1574	Music Playlist		Hard
1575	Spring Tour		Easy
1576	Optimal Match		Hard
1577	Sum of leaf nodes		Medium
1578	Number of A	JavaScript	Medium
1579	Alphabetic string calculation		Medium
1580	Transition String		Medium
1581	Longest Subsequence	JavaScript	Medium
1582	Minimum Path Sum II		Medium
1583	Maximum Number Sum		Medium
1584	Number Of Xor Values		Medium
1585	Moving Stones		Easy
1586	Minimum Number Of Keystrokes		Medium
1587	String Segmentation	TypeScript	Medium
1588	All Possible Full Binary Trees		Medium
1589	Groups of Special-Equivalent Strings		Easy
1590	Surface Area of 3D Shapes		Easy
1591	Sum of Subsequence Widths		Hard
1592	Find and Replace Pattern		Medium
1593	Construct Binary Tree from Preorder and Postorder Traversal	JavaScript	Medium
1594	Fair Candy Swap	JavaScript	Easy
1596	Possible Bipartition		Medium
1597	Spiral Matrix III		Medium
1598	Uncommon Words from Two Sentences	JavaScript	Easy
1599	Projection Area of 3D Shapes		Easy
1600	Reachable Nodes In Subdivided Graph		Hard
1601	Boats to Save People	JavaScript	Medium
1602	Decoded String at Index	TypeScript	Medium
1604	Maximum Sum of Two Numbers	TypeScript	Medium
1607	Profitable Schemes		Hard
1608	Nth Magical Number		Hard
1609	Middle of the Linked List	JavaScript	Easy
1610	Find the numbers		Medium
1611	Shortest subarray		Medium
1612	Smallest Path		Medium
1613	Highest frequency IP	TypeScript	Naive
1614	Highest growth stock		Easy
1615	The result of investment		Easy
1616	Shortest subarray II		Hard
1617	Array Maximum Difference		Easy
1618	Processing Form		Medium
1619	Candy II		Medium
1620	Collecting Coins		Super
1621	Cut Connection		Easy
1623	Minimal Distance In The Array		Easy
1624	Max Distance		Hard
1625	Words Compression		Hard
1626	Salary Adjustment		Medium
1627	Word Segmentation		Medium
1628	Driving problem		Medium
1629	Find the nearest store		Medium
1630	Interesting String		Medium
1631	Interesting Subarray		Medium
1632	Count email groups		Easy
1633	Strings That Satisfies The Condition		Easy
1634	Secret Word		Medium
1635	Max Pair		Medium
1636	Aerial Movie		Medium
1637	Tree problem		Medium
1638	Least Substring		Easy
1639	K-Substring with K different characters		Medium
1640	Duplicates Digits		Hard
1641	Max Remove Order		Medium
1642	Query String		Medium
1643	Pick Fruits		Medium
1644	Plane Maximum Rectangle		Medium
1645	Least Subsequences		Medium
1646	CheckWords		Medium
1647	Path Search		Medium
1648	max substring		Hard
1649	Super Lollipop	TypeScript	Easy
1656	Legal Number Statistics	JavaScript	Easy
1657	Operation Time		Easy
1659	Legal Number Statistics II	TypeScript	Easy
1665	Calculate number	JavaScript	Easy
1669	Build a temple	TypeScript	Medium
1685	The mazeIV		Medium
1691	Best Time to Buy and Sell Stock V		Medium
1694	Monster Hunter		Hard
1698	Delete Columns to Make Sorted		Easy
1699	Find the Shortest Superstring		Hard
1700	DI String Match		Easy
1701	Valid Mountain Array		Easy
1702	Distinct Subsequences II	JavaScript	Hard
1703	Minimum Area Rectangle		Medium
1704	Range Sum of BST	JavaScript	Medium
1705	Compare Strings II		Easy
1706	Stamping The Sequence		Hard
1707	Knight Dialer		Medium
1708	Shortest Bridge		Medium
1709	Number of Recent Calls		Easy
1710	Beautiful Array		Medium
1711	Minimum Falling Path Sum	JavaScript	Medium
1712	Binary Subarrays With Sum	TypeScript	Medium
1713	Unique Email Addresses		Easy
1714	Minimize Malware Spread II		Hard
1715	Three Equal Parts	TypeScript	Medium
1716	Flip String to Monotone Increasing	JavaScript	Medium
1718	Minimize Malware Spread		Hard
1719	3Sum With Multiplicity	JavaScript	Medium
1721	Minimum Add to Make Parentheses Valid	JavaScript	Medium
1722	Number of Music Playlists		Hard
1723	Shortest Path in a Grid with Obstacles Elimination		Medium
1724	Maximum Sum Circular Subarray	JavaScript	Medium
1725	Reverse Only Letters		Easy
1726	Word Subsets		Medium
1727	Partition Array into Disjoint Intervals	JavaScript	Medium
1728	X of a Kind in a Deck of Cards	Python	Easy
1729	Cat and Mouse		Hard
1730	Spreadsheet Notation Conversion		Easy
1731	Smallest Range II		Medium
1732	Snakes and Ladders		Medium
1733	Smallest Range I		Easy
1734	Sum of Subarray Minimums		Medium
1735	Super Palindromes		Hard
1736	Throw garbage		Medium
1737	Fruit Into Baskets		Medium
1738	Valid Permutations for DI Sequence		Hard
1739	Numbers At Most N Given Digit Set		Medium
1740	Online Stock Span		Medium
1741	RLE Iterator		Medium
1742	Orderly Queue		Hard
1743	Bitwise ORs of Subarrays		Medium
1744	Increasing Order Search Tree	JavaScript	Easy
1745	Monotonic Array	JavaScript	Easy
1746	Minimum Distance Between BST Nodes	JavaScript	Easy
1747	Robot Return to Origin		Easy
1753	Doing Homework	TypeScript	Medium
1756	Buy beverage		Medium
1761	Digital Huarong Road		Hard
1767	Minimum Tree Coverage		Hard
1772	Number of collections		Super
1778	Odd Even Jump		Hard
1779	Shortest Duplicate Subarray	JavaScript	Easy
1780	The Candidate With the Most Votes		Easy
1781	Reverse ASCII Encoded Strings		Easy
1782	No Pairs Allowed		Medium
1783	Binary Tree Postorder Traversal-null	JavaScript	Easy
1784	Decrease To Be Palindrome		Easy
1786	Pub Sub Pattern		Easy
1787	Google Suggestion (Map Reduce)		Medium
1788	Ascending Binary Sorting		Medium
1789	Distinguish Username		Easy
1790	Rotate String II	TypeScript	Easy
1791	Simple queries		Medium
1792	Cut the sticks		Easy
1793	Balanced Array		Easy
1794	Count Duplicates		Easy
1795	Is Possible		Medium
1796	K-Difference		Medium
1797	optimalUtilization		Easy
1798	Minimum Cost to Merge Stones		Hard
1799	Sequence summation		Easy
1800	Float Combination Sum		Medium
1801	the sum of legal set		Easy
1802	Grid Game		Medium
1803	Rotate beam		Hard
1804	Find The Rank		Easy
1807	Fibonacci easy	Python	Easy
1808	Minimum Domino Rotations For Equal Row		Medium
1811	Find Maximum Gold		Medium
1812	Rotation Number		Easy
1813	Construct Binary Tree		Medium
1814	Sum of all Subarrays	Python	Easy
1815	Threhold Alerts		Easy
1816	Find the Smallest Divisor Given a Threshold	TypeScript	Medium
1817	Divide Chocolate		Hard
1819	Longest Semi Alternating Substring		Easy
1820	Find Letter	TypeScript	Easy
1821	Min Deletions To Obtain String in Right Format	TypeScript	Easy
1822	Minimum Moves	TypeScript	Easy
1823	Longest Prefix of Array		Easy
1824	Most Frequent Substring		Medium
1825	Number Change		Medium
1827	Number of Ways to Stay in the Same Place After Some Steps II	TypeScript	Medium
1828	Lake Escape		Hard
1829	Find the number of shortest path		Medium
1831	Array Summarization		Easy
1832	Minimum Step		Medium
1833	pen box		Medium
1834	Grouping Options		Hard
1835	Number of Ways to Stay in the Same Place After Some Steps I	TypeScript	Easy
1836	Reaching Point		Medium
1840	Matrix restoration		Medium
1844	subarray sum equals to k II		Medium
1846	Reaching Point II		Medium
1848	Word Search III		Hard
1849	Grumpy Bookstore Owner	TypeScript	Medium
1850	Pick Apples	TypeScript	Medium
1851	Buy Passes	TypeScript	Medium
1852	Final Discounted Price	TypeScript	Medium
1853	Efficient Job Processing Service		Medium
1854	Partition Array III		Easy
1855	Reach Destination		Hard
1856	Sub-palindrome		Easy
1857	Find Friend Circle Number		Medium
1858	Set of boxes		Hard
1859	Minimum Amplitude		Easy
1860	the Number of 0-submatrix		Hard
1861	Rat Jump		Hard
1862	Time to Flower Tree		Medium
1867	Most Frequent Word II		Easy
1868	Find the Number of “Balance” in the String		Medium
1869	Count Square Submatrices with All Ones		Medium
1870	Number of Substrings with All Zeroes	TypeScript	Medium
1871	Maximum moment	TypeScript	Easy
1872	Minimum Cost to Connect Sticks	TypeScript	Medium
1874	Kth Smallest Element in a Specific Array		Medium
1876	Alien Dictionary(easy)	TypeScript	Easy
1877	longest super sequence		Medium
1878	Rotated Nums	TypeScript	Easy
1879	Two Sum VII		Hard
1880	Largest Number X Which Occurs X Times		Easy
1881	Aircraft seat	TypeScript	Easy
1882	Fair Indexes	TypeScript	Medium
1883	Top K Frequently Mentioned Keywords		Medium
1884	Take Away The Bottle		Hard
1885	A Strange Sorting Problem		Hard
1886	Moving Target	TypeScript	Easy
1887	Stretch Word	TypeScript	Easy
1888	Shortest Path in Matrix		Medium
1889	Interval Merge		Medium
1890	Form Minimum Number		Medium
1891	Travel Plan		Medium
1892	Mine-sweeping		Medium
1893	the Valid String		Medium
1894	Ad Click Analysis		Easy
1895	Arrange interview city	TypeScript	Easy
1896	Pick Carrots	TypeScript	Easy
1897	Meeting Room III		Medium
1899	Fetch supplies II		Medium
1900	Gene Similarity		Hard
1901	Squares of a Sorted Array	TypeScript	Easy
1902	Find Google	TypeScript	Easy
1903	Department Statistics		Easy
1904	Place the Balls		Hard
1905	Character deletion	JavaScript	Easy
1906	Look for points that are bigger than the surrounding area	TypeScript	Easy
1907	Array Game		Medium
1908	Boolean expression evaluation		Hard
1909	Order allocation		Medium
1910	Most numbers	TypeScript	Naive
1911	As Far from Land as Possible	TypeScript	Medium
1913	Query Student Enrollment Information		Naive
1914	Smart Sale	JavaScript	Medium
1915	Lifting Weights		Hard
1916	Longest lighting time	TypeScript	Easy
1917	Cutting Metal Surplus		Medium
1918	The height of the second tallest player		Medium
1919	Members Whose Scores Exceed the Group leader		Naive
1920	Find a Classmate with the Same Name		Naive
1921	Players Who Never Recharge		Naive
1922	Delete Duplicate Names		Medium
1923	Increasing Number of Infections		Naive
1924	Recommend Student to Study Science		Naive
1925	At Least Three Players Have Scored		Naive
1926	Popular Hero		Naive
1927	Coin Flip		Naive
1928	Analysis of Online Class I		Naive
1929	Analysis of Online Class II		Medium
1930	Public Rental Housing Information Query		Naive
1931	Find Specific Patient		Naive
1932	Students with the Most Failed Subjects I		Naive
1933	Students with the Most Failed Subjects II		Medium
1934	Zhang San's Story I		Naive
1935	Zhang San's Story II		Medium
1936	Zhang San's Story III		Medium
1937	Consecutive Empty Boxes		Medium
1938	Query User Email		Naive
1939	Resume Delivery I		Medium
1940	Resume Delivery II		Medium
1941	Find Right Triangle		Naive
1942	Two Nearest Saplings		Medium
1943	Looking for Students of a Certain Height		Medium
1944	Bike Sharing		Naive
1945	Club Annual Competition Score Ranking I		Naive
1946	Club Annual Competition Score Ranking II		Medium
1947	Install Django		Naive
1948	Show Hello, world! in the home page		Naive
1949	Count the Number of Users		Naive
1950	Query courses with more than 800 students		Naive
1951	Query courses with given teacher		Naive
1952	Query teachers over 20 years old		Naive
1953	Query the name of the Chinese teacher		Naive
1954	Query course information with the number of students within a specified range		Naive
1955	Query teachers who do not meet the conditions		Naive
1956	Query information about Eastern Heretic teachers		Naive
1957	Inquire about courses starting before May 2020		Naive
1958	Query the courses that meet the conditions taught by the specified teacher		Naive
1959	Query information about Chinese and British teachers		Naive
1960	Query course information for a specific time		Naive
1961	Query information about non-Japanese and non-American teachers		Naive
1962	Query courses with teacher id other than 1 and 3		Naive
1963	Search for teachers aged 20~25 whose nationality is not Chinese or British		Naive
1964	Query for course information about the number of students within the specified range		Naive
1965	Search for information on teachers who are not within the age range of 20 to 30 years		Naive
1966	Use NOT BETWEEN to search for teachers with Chinese nationality		Naive
1967	Search for courses starting with the letters 'D' to 'O'		Naive
1968	Query the course name with the first two letters between 'Db' and 'Dy'		Naive
1969	Query the courses starting in 2020		Naive
1970	Search for courses with a creation date of June to August 2020		Naive
1971	Search for teachers whose email is empty		Naive
1972	Inquire about Chinese and Japanese teachers who have e-mail addresses		Naive
1973	Search for all courses starting with the letter 'D'		Naive
1974	Query teacher information by email		Naive
1975	Inquire about the teacher who is Tencent's mailbox and is of Chinese nationality		Naive
1976	Sort course information by number of students		Naive
1977	Sorted by age of Chinese teachers in descending order		Naive
1978	Sort by age of Chinese teachers in ascending order		Naive
1979	Check the three courses with the lowest number of students		Naive
1980	Search for the oldest Chinese teacher		Naive
1981	Check the nationality of all teachers		Naive
1982	Check the age of teachers and sort them in ascending order		Naive
1983	Query the average number of students in the curriculum		Naive
1984	Count the number of different teacher_id		Naive
1985	Number of teachers aged 20 to 28 who are Chinese and British nationals		Naive
1986	Query the maximum number of students in all courses		Naive
1987	Find the age of the oldest Chinese teacher		Naive
1988	Check the number of students in the course with the lowest number of students		Naive
1989	Check the age of the youngest teacher		Naive
1990	The total number of students enroll in all courses		Naive
1991	Count the total number of students for teacher #3		Naive
1992	Check average course enrollment		Naive
1993	Delete the course called Dynamic Programming		Naive
1994	Update all course information		Naive
1995	Check the average age of teachers over 20 years old		Naive
1996	Determining whether a teacher has a mailbox		Naive
1997	Check the information of teachers who do not have email and are older than 20 years old		Naive
1998	Statistics for courses in January to May 2020		Naive
1999	Query the number of students and the course information that meets the requirements of the course name		Naive
2000	Search for course information of System Design		Naive
2001	Query the course information of 'Web' or 'Big Data'		Naive
2004	Delete all courses until 2020		Naive
2005	Query information about 18-year-old Chinese teachers		Naive
2006	Query all courses		Naive
2007	Check course name and class size		Naive
2008	Query the course information of two courses		Naive
2009	Query all teachers		Naive
2010	Search all course names		Naive
2011	Search for information on courses with more than 1000 participants		Naive
2012	Find course information for the course named Artificial Intelligence		Naive
2013	Check the name of the teacher		Naive
2014	Query course name and course creation time		Naive
2015	Inserting Python course information into the course table		Naive
2016	Update the email address of the designated teacher		Naive
2017	Inserting SQL course information into the course table		Naive
2018	Insert 'Flash Sale' course information into the specified column of the course schedule		Naive
2019	Delete all rows in the table		Naive
2020	Update on the number of students choosing artificial intelligence		Naive
2021	Insert teacher information into the specified column of the teachers table		Naive
2022	Delayed all course creation dates by one year		Naive
2023	Calculate the number of days from 01/13/2018 to the time of course creation		Naive
2024	Query the course name and year of creation date of all course schedules		Naive
2025	Check the course creation time in the course schedule		Naive
2026	Insert the current time into the table (accurate to milliseconds)		Naive
2027	Query course creation date by 'year month'		Naive
2028	Postpone all course creation dates by one day		Naive
2029	Calculate the number of days from 03/26/2019 to the course creation time		Naive
2030	Query the hours of all course creation times		Naive
2031	Advance all course creation dates by one month		Naive
2032	Advance all course creation dates by one day		Naive
2033	Query the course name and creation time in seconds for all course schedules		Naive
2034	Check the average age of teachers at the end of the specified mailbox		Naive
2035	Calculate the number of years difference between the start date and the current date of all courses in the course schedule		Naive
2036	Calculate the number of months difference between the given date and the creation date of all courses in the course schedule		Naive
2037	Search for course titles and course dates through August 2020		Naive
2038	Search for the date and time in the course creation time of the course schedule respectively		Naive
2039	Query the creation date of the course in the course schedule		Naive
2040	Search for courses with an instructor id of less than 3 and more than 800 students		Naive
2041	Search for information on courses taught by designated teachers		Naive
2042	Query all course names in the course schedule and the year and month of the creation date		Naive
2043	Search for courses created in the first quarter		Naive
2044	Output Hello SQL		Naive
2045	Output Hello LintCode		Naive
2046	The date the course was created is displayed in 'year-month-day hour:minute:second'		Naive
2047	Copy all the data in the teacher table to another table		Medium
2048	Search for information on all courses taught by a given teacher		Medium
2049	Change the course name created by the teacher Western Venom		Medium
2050	Search for teacher‘s name and the name of courses they taught		Easy
2051	Search for the names of teachers from China and the names of courses they taught		Naive
2052	Check the name of the instructor, email address and the name of courses they taught		Naive
2053	Check the name, email and course name of the teacher from China		Naive
2054	Check the course name and the age of the corresponding instructor		Naive
2055	Search for all course names and their corresponding instructor names and nationalities		Naive
2056	Copy the data in the teachers table that are older than 20 to another table		Medium
2057	Modify course information created by instructor Eastern Heretic		Naive
2058	Delete all courses for teachers younger than 21 years old		Medium
2059	Remove faculty who have created courses before 2020		Medium
2060	Search for the name of the teacher for the 'Big Data' course		Easy
2061	Check the course title and email address of the instructor		Naive
2062	Query the id and name of all courses taught by the specified teacher		Easy
2063	Search for the names of all courses taught by teachers whose nationality is 'USA'		Medium
2064	Check course information for courses with more students than Western Venom teachers		Medium
2065	Check the course names of all courses taught by all teachers who are older than 20 years old		Medium
2066	Search for course information for courses with more students than the number of students in all courses of the oldest teacher		Medium
2067	Search for information on any course with more students than the 'Eastern Heretic' class size		Medium
2068	Check the maximum age of teachers of different nationalities		Medium
2069	Search for the course name and number of students in the course with the highest number of students per instructor		Medium
2070	Search for the name of a course created later than the creation time of any of the specified teacher's courses		Medium
2071	Search for information on the oldest faculty member whose nationality is American		Medium
2072	Search for course names of all courses taught by teachers who are not older than 20 years old		Medium
2073	Query the `id` and and the number of students for all courses taught by teachers whose nationality is not 'USA' and 'UK'		Easy
2074	Search for the names of teachers whose average number of students in classes taught by all teachers exceeds the average number of students in all courses		Medium
2075	Check the number of teachers in different countries		Naive
2076	Search for teacher information based on national average age		Medium
2077	Search for information on courses and instructors with the highest number of students		Medium
2078	Find out the number of teachers of different ages		Naive
2079	Count the total number of students in each teacher's course		Medium
2080	Search for the name of the instructor and the total number of students in all the instructor's courses with less than 3000 students		Naive
2081	Insert the current date into the table		Naive
2082	Statistics on the number of courses taught by each teacher		Easy
2083	Create student table and add primary key constraint on ID column		Naive
2084	Add primary key constraints to the course table courses		Naive
2085	Remove the primary key constraint from the course table `courses`		Naive
2086	Query the Nationality of Teachers Starting with ‘U’ and the Total Number of Students Between 2000 and 5000 and the Total Number of Students of Teachers of That Nationality		Easy
2087	Implemente Linear Regression based on sklearn		Easy
2088	First Java Code: Print Hello World	Java	Naive
2089	Implement timer decorator		Medium
2090	Print Zero, Even and Odd Number II		Medium
2091	Adding Foreign Key Constraints to Course Tables		Easy
2092	Search for a lecturer number		Easy
2093	Check the portfolio of courses and teachers		Naive
2097	Find the sum of two parameters		Naive
2098	Read the values in the file and sum them		Naive
2105	Write Hello World! in the file		Naive
2106	Create a file directory and write Hello World!		Naive
2107	Copy files in bulk		Medium
2123	Get yesterday's date		Naive
2124	print hello		Naive
2125	Call the methods in the file main		Naive
2126	Import one of the files in a module folder		Naive
2127	Implementing reverse sorting of numbers in a list		Naive
2128	Use of list built-in methods		Naive
2129	Modify the value of a specified subscript of a list		Naive
2130	The subscript element of the specified list		Naive
2131	Nesting of lists		Naive
2132	Importing a module		Naive
2133	Use list derivatives to filter elements in any range		Naive
2134	General operation of the list		Naive
2135	Import a module and alias it		Naive
2136	Find out when a course was created and the nationality of the teacher		Naive
2137	Print out SMS verification code		Naive
2139	print format outputs course information		Naive
2140	The number of the two numbers in the list whose sum is equal to n		Naive
2141	Determine if a string is uppercase and the consecutive characters are not repeated		Naive
2142	Replace the elements in a string		Naive
2143	Implementing a shopping cart program		Easy
2145	Exception Handling		Naive
2146	Implement Decorator with Parameters		Naive
2147	Implement an API to Access User Data		Easy
2148	Implement User Login API		Medium
2153	Implement an API to Check User's Login Status		Easy
2155	Implement User Signup API		Medium
2156	Implement User Logout API		Easy
2157	Print Welcome to LintCode!	Java	Naive
2158	Custom Exceptions		Easy
2159	Printing strings by splicing	Java	Naive
2160	Print "Hello Java"	Java	Naive
2161	Implement a Class Dog Inherit from Animal		Medium
2162	Filter Users by Email		Easy
2163	Realize age-based determination of adulthood	Java	Naive
2164	Pass or fail according to the score	Java	Naive
2165	Calculate the values of 1+2+3+... +n values	Java	Naive
2166	Simple addition, subtraction, multiplication and division	Java	Naive
2167	Get or Create a User Object		Naive
2168	Printable Trigonometric NIne NIne Multiplication Table	Java	Naive
2169	Three by three generation of data		Medium
2170	Read file contents		Naive
2171	Django Rest Framework Setup (Bug Fix)		Naive
2172	Implement User Login API (Bug Fix I)		Easy
2173	Implement User Signup API (Bug Fix)		Naive
2174	Query the number of 'your' words in the file		Naive
2175	Rounding	Java	Naive
2176	Find the maximum value of an array	Java	Naive
2177	Implement User Login API (Bug Fix II)		Easy
2178	Iterators and Fibonacci series		Easy
2180	Comparing the size of two numbers		Naive
2181	Iterator and an even series		Easy
2182	Calculate the sum of all positive integers up to and including n that are divisible by 3	Java	Naive
2183	Determine the student's achievement range based on the student's achievement level	Java	Naive
2184	Implement User Signup API (Bug Fix II)		Easy
2185	Count the number of times an element appears in the list		Naive
2186	Calculate the factorial of n		Naive
2187	Combining and sorting lists (one)		Naive
2188	Get the element with index 1	Java	Naive
2189	Check the age of teachers and sort in ascending order		Naive
2190	Select nationality from teacher between 20 and 25 who is not from China or UK		Easy
2191	Query information about teachers over n years old		Naive
2192	Query teacher information by email (Django)		Naive
2193	Query the information of the teacher whose id is 1		Easy
2194	Query the first few data		Naive
2195	Query teacher information whose specified field is empty		Naive
2196	Query teacher information of a given nationality		Naive
2197	Query information about teachers who are not older than the specified age and are not of the specified nationality		Easy
2198	Query all the information of the teacher		Naive
2199	Remove empty lines from files		Naive
2200	Calculate all leap years from 1949 to n	Java	Naive
2201	Get the element whose index is the last digit	Java	Naive
2202	Calculate Sum (Python version)		Naive
2203	Get the length of the string	Java	Naive
2204	The remainder of a partial function to divide two positive integers		Easy
2205	Binary to decimal conversion		Naive
2206	Get the sum of the lengths of all strings in the string array	Java	Naive
2207	Filter out all odd numbers		Medium
2208	Create objects, assign values to object properties and print	Java	Naive
2209	Create subclass objects and print data using parent class methods	Java	Easy
2211	Judge the number of palindrome		Naive
2212	Write assignment methods and print methods for object properties	Java	Naive
2216	String summing, repeated output, slicing		Naive
2226	Determine if the specified character is present in the string		Naive
2227	Bit arithmetic shift left by three bits (Java version)	Java	Naive
2228	Slicing and Splicing		Naive
2229	Find the length, maximum value and minimum value of a tuple		Naive
2231	Implementing the area calculation method	Java	Naive
2232	Print the food that cats and dogs like to eat	Java	Easy
2240	Update string		Naive
2241	Get the millisecond value of the specified date	Java	Easy
2242	Print book information	Java	Easy
2244	Print work content	Java	Naive
2246	Polymorphic way to call drawing methods	Java	Naive
2247	decision odd or even		Naive
2248	Calculate the number of days of a person's birth	Java	Easy
2249	Implement the methods of the Pig and Dog classes	Java	Easy
2250	The absolute value of an integer		Naive
2251	Print the name and number information of three objects	Java	Naive
2252	Judgment Results		Naive
2253	Print the characteristics of spring, summer, autumn and winter	Java	Naive
2254	Get the length of the string after removing spaces	Java	Naive
2256	Replace the contents of a string	Java	Easy
2257	Determining whether a number is prime or not		Naive
2258	Find the largest prime number backwards		Naive
2259	Calculate Sum (Java version)	Java	Naive
2260	List slicing with step		Naive
2261	Delete elements in the list		Naive
2262	Splicing and copying of lists		Naive
2263	string splicing		Naive
2264	Convert upper and lower case letters in a string		Naive
2265	Find the maximum and minimum values of the elements in a tuple		Naive
2266	Swap Two Integers (Java version)	Java	Naive
2267	Find The Maximum Of Three Numbers (Python version)		Naive
2268	Get the attributes of a bull	Java	Naive
2269	Swap Two Integers (Python version)		Naive
2270	Integer Arithmetic (Java version)	Java	Naive
2271	Integer Arithmetic (Python version)		Naive
2272	Find The Maximum Of Three Numbers (Java version)	Java	Naive
2273	Sequential Output (Python version)		Naive
2274	First Python Code: Print Hello World		Naive
2275	Sequential Output (Java version)	Java	Naive
2276	Modify and delete elements in the dictionary		Naive
2277	Calculate the sum of all values in the dictionary		Naive
2278	Access to student information	Java	Naive
2279	Reverse Integer Order (Python version)		Naive
2281	Merge dictionary		Naive
2282	Circular Perimeter (Python version)		Naive
2283	Circular Perimeter (Java version)	Java	Naive
2284	Judge The Multiple Of 3 And 5 (Python version)		Naive
2286	Find the greatest common divisor (Python version)		Naive
2287	Judge The Multiple Of 3 And 5 (Java version)	Java	Naive
2288	ASCII Code Of The Character (Python version)		Naive
2289	ASCII Code Of The Character (Java version)	Java	Naive
2290	Find the greatest common divisor (Java version)	Java	Naive
2291	Splicing and copying of tuple		Naive
2311	Rounding a string number	Java	Naive
2312	Combine the keys and values of the dictionary into a new list		Easy
2313	Print the character represented by the Plum, Orchid and Bamboo	Java	Naive
2314	List modification, addition and deletion of elements	Python	Naive
2315	Judge the triangle (Python version)		Naive
2316	Judgment Triangle (Java Edition)	Java	Naive
2317	Take A Square Root (Python version)		Naive
2318	Using Anonymous Internal Classes	Java	Naive
2319	List nesting		Naive
2320	Take A Square Root (Java version)	Java	Naive
2321	Hit rate rating (Python version)		Naive
2322	Delete the content at the specified position in the string	Java	Easy
2323	Hit rate rating (Java version)	Java	Naive
2324	Output String In Reverse Order (Python version)		Naive
2325	Output string in reverse order (Java version)	Java	Naive
2326	Determining whether an integer is a daffodil number	Java	Naive
2327	Finding The Distance Between Two Points In Rectangular Coordinate System (Python version)		Naive
2328	Operations between sets		Naive
2329	Finding The Distance Between Two Points In Rectangular Coordinate System (Java version)	Java	Naive
2330	Calculate the time after x seconds		Naive
2331	Find the length, maximum value and minimum value of list		Naive
2332	Calculate Factorial (Python Edition)		Naive
2333	Print matrix (Python version)		Naive
2334	Calculate factorial (Java Edition)	Java	Naive
2335	Find all the daffodils (Python version)		Naive
2336	Case conversion of letters in strings	Java	Easy
2337	Set containment		Naive
2338	Using custom exceptions	Java	Naive
2339	Judging Leap Year (Java version)	Java	Naive
2340	Count the number of lowercase letters (Python version)		Naive
2341	Find the number of lowercase letters (Java version)	Java	Naive
2342	The sum of the main diagonal elements (Python version)		Naive
2343	Judge Whether It Is A Complete Number (Python version)		Naive
2344	Determine whether it is a perfect number (Java version)	Java	Naive
2345	Movement distance calculation (Python version)		Naive
2346	Movement distance calculation (Java version)	Java	Naive
2347	Use of Static Code Blocks	Java	Naive
2348	Output Yanghui Triangle (Python version)		Naive
2349	Count the number of different characters in a string	Java	Easy
2350	Judging Leap Year (Python version)		Naive
2351	Splicing Two Strings (Python version)		Naive
2352	Splicing Two Strings (Java version)	Java	Naive
2353	Generate a dictionary of perfect squares		Naive
2354	Odd sum and even sum (Java Edition)	Java	Naive
2355	Odd Sum And Even Sum (Python Edition)		Naive
2356	Print nine-nine multiplication table (Python version)		Naive
2357	Exchange within an array (Python version)		Naive
2358	Exporting prime numbers	Java	Naive
2359	Print nine-nine multiplication table (Java version)	Java	Naive
2360	Find all the daffodils (Java version)	Java	Naive
2361	The sum of the main diagonal elements (Java version)	Java	Naive
2362	Count the number of elements consisting of pure numbers and pure letters from the specified list separately		Naive
2363	Split the string according to the line boundary character and find the longest line		Easy
2364	Output the nth prime number		Naive
2365	Calculate the sum of the array (Python version)		Naive
2366	Calculate the sum of the array (Java version)	Java	Naive
2367	Array sort (Python version)		Naive
2368	Array sort (Java version)	Java	Naive
2369	Using the final keyword	Java	Naive
2370	Dictionary key value swap		Naive
2371	Converts a specified temperature from Fahrenheit to Celsius		Naive
2372	break Out Of Loop (Python version)		Naive
2373	break out of the loop (Java version)	Java	Naive
2374	Bug fix for final keyword	Java	Naive
2375	Judge the power of two(Java Edition)	Java	Naive
2376	Determine the number of echoes	Java	Naive
2377	Determine The Power Of 2 (Python version)		Naive
2378	final variables are immutable	Java	Naive
2379	Connect list elements (Python version)		Naive
2380	Create an ArrayList collection and add data	Java	Naive
2381	Exchange in an array (Java version)	Java	Naive
2382	Can drink at most a few bottles of wine (Python version)		Naive
2383	Headerised strings		Naive
2384	Bug fix for static keyword	Java	Naive
2385	Find a To The Power Of b (Python version)		Naive
2386	Find a To The Power Of b (Java version)	Java	Naive
2387	Find the most expensive item		Naive
2389	Removing duplicate numbers	Java	Naive
2390	Complete the string determination as required		Naive
2391	Create a HashSet collection and add data	Java	Naive
2392	Iterate over the key-value pairs in the print dictionary		Naive
2393	Iterating through an ArrayList collection	Java	Naive
2394	Print matrix (Java version)	Java	Naive
2395	Count the number of occurrences of a string		Naive
2396	Generator matrix		Naive
2397	List comprehension		Naive
2398	Output integers in reverse order (Java version)	Java	Naive
2399	List merge and sort (two)		Naive
2400	Create a HashMap set and add data	Java	Naive
2401	Letter transformation (Python version)		Naive
2402	Letter Transformation (Java Edition)	Java	Naive
2403	Outputs the Key and Value of all data in the HashMap collection	Java	Naive
2404	Removing duplicate elements and sorting	Java	Naive
2405	String replacement		Naive
2406	String de-duplication and order assurance	Java	Naive
2407	Calculate the value of a + aa + aaa + aaaa		Naive
2408	String character sorting	Java	Naive
2409	Create a dictionary with the specified sequence and values		Naive
2410	Delete the last key-value pair of the dictionary		Naive
2411	Print the number of days contained in each month	Java	Naive
2412	continue To Continue The Loop (Python version)		Naive
2413	continue To Continue The Loop (Java version)	Java	Naive
2414	Print prime numbers (Python version)		Naive
2415	Looking for missing numbers (Java version)	Java	Naive
2416	N threads to achieve quick sort		Hard
2417	Count how many numbers are in the string	Java	Naive
2418	Bit arithmetic shift left by three bits (Python version)		Naive
2419	Output the elements of the set in reverse order	Java	Naive
2420	Looking for missing numbers (Python version)		Naive
2422	Find the position index of a substring in a string	Java	Naive
2423	Calls to private variables	Java	Naive
2424	Output Yanghui Triangle (Java version)	Java	Naive
2425	Calculate the number of folds of paper	Java	Naive
2426	Print prime numbers (Java version)		Naive
2427	Implement the Tweet Model		Easy
2428	Start 2 threads to print interleavly 1-n		Medium
2429	Calculate how long since the tweet was posted		Easy
2430	Implement the Friendship Model		Easy
2433	3 threads interleavly print decreasing numbers n - 1		Medium
2434	Define composite index and default ordering		Easy
2435	Get User Posted Tweets		Easy
2436	Two threads interleavly print numbers and letters		Medium
2437	Implement API to create new tweet		Easy
2438	n threads print 1-m		Medium
2439	Start 2 threads to print "Hello" and "World" respectively		Medium
2442	Print ABC interleavly		Medium
2443	Get All following Users		Easy
2444	3 threads to print n groups		Medium
2445	Implement Follow User API		Medium
2446	Get All followers		Easy
2447	Implement an API to Unfollow a User		Medium
2448	N threads to achieve merge sort		Hard
2449	Sleep Sort		Easy
2450	Start the thread to print hello world		Naive
2451	Use 10 threads to calculate the sum of 1-n		Medium
2452	Main thread and sub thread print interleavly		Medium
2453	Use N threads to calculate the sum of the array		Medium
2454	N threads to find the number with most factors		Easy
2455	Define Comment Model		Medium
2456	Implement an API to Created Comment		Medium
2457	Implement an API to Update Comments		Medium
2458	Implement an API to Delete Comment		Medium
2459	Nth highest player height		Medium
2460	Player Height Ranking1		Medium
2462	Design Bounded Blocking Queue		Medium
2463	Define the NewsFeed Model		Medium
2464	Implement an API to Get NewsFeeds		Easy
2465	Data shuffle based on Sklearn		Naive
2466	List deduplicate		Naive
2467	Design Bounded Blocking Stack		Medium
2468	Fanout New Tweets to NewsFeed		Medium
2469	Implement an API to Get Comment List		Medium
2470	Implement a single tweet API with comments		Medium
2471	Design Thread Safe Linked List		Medium
2472	Adding elements to a set		Naive
2473	Design Thread Safe Hash Table		Medium
2474	Define The Like Model		Medium
2475	Implement an API to Create Like		Hard
2476	Implement an API to Dislike		Medium
2477	Inject like information into the comment API		Medium
2478	Implement an API to Send Comment Notification		Medium
2479	Implement an API to Send Like Notification		Medium
2491	Implement an API to get the number of unread messages		Easy
2492	Implement data normalization based on Sklearn		Naive
2493	Implement data standardization based on Sklearn		Naive
2494	Summation of a tuple at a specified position		Naive
2495	Calculate F1 score of data based on Sklearn		Naive
2496	4 threads modify the same variable		Easy
2497	Deposit and Withdraw Money		Easy
2498	Set update operation		Naive
2499	Height of players appearing consecutively		Medium
2500	Highest scoring player in the team		Medium
2501	Implement the One Click Read API		Easy
2502	Design Thread Safe Array List		Medium
2503	Implement a thread-safe counter		Easy
2504	Log recording with multithreading		Easy
2505	Calculate accuracy score based on Sklearn		Naive
2506	Remove the Invalid Parentheses	JavaScript	Easy
2507	Recognition hand writing digital images based on KNN algorithm		Easy
2508	Recognition hand writing digital images based on Logistic Regression algorithm		Easy
2509	Find a number that appears only once in the list		Easy
2510	Recognition hand writing digital images based on Multi-layer Perceptron		Easy
2511	Code constructor to initialize student class instance		Easy
2513	Remove Folder		Naive
2514	Copy folder		Naive
2515	The only number that exists	Java	Naive
2518	Series Data Type Creation		Naive
2519	DataFrame Data Type Creation		Naive
2520	pandas index		Naive
2521	pandas Hierarchical Index		Naive
2522	pandas data merge		Naive
2523	Hand writing digital image recognition based on MNIST dataset		Medium
2524	Group Aggregation		Easy
2525	basic_attribute_and_overall_situation_query		Naive
2526	Pandas Data Read		Naive
2527	Pandas Missing value handling		Naive
2528	data_analysis_for_mean_value		Naive
2529	Removing duplicate values from dataset using Pandas		Naive
2530	Intercept even numbers from a given sequence		Naive
2531	Index of matrix elements		Easy
2532	numpy mathematical calculation method practice		Easy
2533	Create an 8x8 chess board matrix		Easy
2534	Create a dtype to represent the color (RGBA)		Easy
2535	Calculate the matrix by subtracting the average of each row		Naive
2536	Create a numpy array		Naive
2538	Based on SimpleImputer class to do missing value processing		Naive
2539	Fill missing values using KNN		Easy
2540	Your First Git Commit		Easy
2541	one-hot code		Naive
2542	Update Linghu Chong's email		Naive
2543	Implement dimensionality reduction based on sklearn		Naive
2544	Insert information about Feng Qingyang		Naive
2545	Implement K-means clusting algorithm based on sklearn		Naive
2546	Find outliers in the data using the absolute median difference algorithm (MAD)		Medium
2547	Query all information in the teachers table		Naive
2548	Update Southern Emperor's email		Naive
2549	Create a new folder		Naive
2550	Find outliers in the data using density-based local outlier factor algorithm (LOF)		Medium
2551	Normalizing data using z-score		Easy
2552	Normalize the data using min-max standardization		Easy
2553	Delete Linghu Chong's message		Naive
2554	Insert information about Chong Xu		Naive
2555	Create a new file		Naive
2556	Update the age of Linghu Chong		Naive
2557	Insert information about Xie Xun		Naive
2558	H2O generation		Medium
2559	Withdrawal of age update for Linghu Chong		Naive
2560	Undo the insertion of Xie Xun's message		Naive
2564	Create a Trigger "before_teachers_insert"		Easy
2565	Create a Trigger "before_teachers_update"		Easy
2566	Logistic regression doing dichotomous classification for cancer prediction		Naive
2567	Delete the Trigger "before_teachers_insert"		Easy
2568	Delete the Trigger "before_teachers_update"		Easy
2569	Normative courses table data insert		Medium
2570	New data processing of recruitment information statistics table		Medium
2571	Text classification based on plain Bayesian algorithm		Naive
2572	New data trigger message alert		Medium
2573	Backup New Data Trigger		Medium
2574	Copying documents		Naive
2575	Normative courses table data update		Medium
2576	Update data processing of recruitment information statistics table		Medium
2577	Backup Update Data Trigger		Medium
2578	Update data trigger message alert		Hard
2579	Calling the sklearn API to implement linear regression to predict home prices in California		Easy
2580	yh_Split dataset (do not move)		Naive
2581	Automatic backup when deleting teacher information		Medium
2582	Moving documents		Naive
2583	Delete data trigger message alert		Medium
2584	shows model loss in predicting boston house prices with cross-validation for ridge regression		Easy
2585	Moving folders		Naive
2586	Delete document		Naive
2587	Associated processing when deleting teachers table information (I)		Easy
2588	Calculate the mean square error loss of the linear regression model		Easy
2589	Calculate precision score of data based on Sklearn		Naive
2590	Calculate recall score of data based on Sklearn		Naive
2591	Manual implementation of linear regression completes California home price forecasting model		Medium
2592	Associated processing when deleting teachers table information (II)		Medium
2593	Show current directory		Naive
2594	Access to the specified directory		Naive
2595	Implement SGD based on sklearn		Naive
2596	compute binary cross-entropy with log_loss		Naive
2597	List file directories and file names		Naive
2598	Show all triggers for teachers table		Easy
2599	Compare the differences between the two documents		Naive
2600	Manual implementation of Principal Component Analysis (PCA) to complete data dimensionality reduction		Medium
2601	Calculate R2 score for model based on sklearn		Naive
2602	Handwritten KNN algorithm for digital image recognition		Medium
2603	Checking disk usage		Naive
2604	View the space occupied by a file		Naive
2605	View username and group name		Naive
2606	View user ID and group ID		Naive
2607	Handwritten K-means algorithm for clustering of iris dataset		Hard
2608	Compare the two documents		Naive
2609	Manual implementation of Logistic Regression to complete the Binary Classification Problem		Medium
2610	Implement SVM classifier based on sklearn		Easy
2611	Determine if two arrays are equal	Java	Naive
2612	Build a decision tree for prediction based on sklearn API		Easy
2613	Submit a document amendment		Naive
2614	Find the perimeter and area of a rectangle	Java	Easy
2615	Print the student's personal information	Java	Easy
2616	Insert Kansas information into the teacher table		Easy
2617	View the current transaction isolation level of the database		Easy
2618	Convert characters in a string to ASCII code	Java	Easy
2619	Track and submit document changes		Naive
2620	View the self-incrementing locking pattern for MySQL databases		Easy
2621	Implementing an API to Update Notification Status		Medium
2622	Print information about cows and horses	Java	Easy
2623	Find eligible files in a directory (i)		Easy
2624	Birds eat worms	Java	Naive
2625	Whether two strings are equal	Java	Naive
2626	Add files to the stage		Naive
2627	Troubleshoot the current database table locks and view the table lock analysis		Easy
2628	Find eligible files in a directory (ii)		Easy
2629	Manual implementation of decision tree algorithm - complete calculation of Gini index function		Medium
2630	Find eligible files in a directory (iii)		Medium
2631	Array string conversion	Java	Easy
2632	Intercept the string at the specified position		Naive
2633	Troubleshoot the current database row locks and view row lock analysis		Easy
2634	Defining the UserProfile model		Easy
2635	The use of optimistic locks and pessimistic locks (I)		Medium
2642	Get user configuration		Medium
2643	Create file link (I)		Naive
2644	Drinking milk for breakfast	Java	Naive
2645	Viewing the contents of a file using a different binary		Naive
2646	Implement decision tree algorithm - complete information entropy calculation function		Medium
2647	Implement the function of uploading user avatar		Medium
2648	View file contents using different decoding methods		Naive
2649	Define the tweet picture model		Medium
2650	Implement the Tweet API		Medium
2651	Implement the function of determining whether you have followed or not		Medium
2652	Implement friend relationship paging function		Medium
2653	Display String (i)		Naive
2654	Put a line lock on the data 'id = 3'		Easy
2655	Array replacement	Java	Naive
2656	Create file link (II)		Naive
2657	Zhang San's self-introduction	Java	Naive
2658	Display personalized information of users		Medium
2659	Implement the function of modifying user nickname		Medium
2660	git Branch Renaming		Naive
2661	What day of the week is this	Java	Easy
2662	Merge files		Naive
2663	Check Pet Information	Java	Naive
2664	Recognizing SQL Views (I)		Naive
2665	Recognizing SQL Views (II)		Easy
2666	Ridge regression based on sklearn to predict boston house prices		Easy
2667	Plotting lines based on Matplotlib		Naive
2668	Create and switch branches		Naive
2669	Modify the last commit		Easy
2670	I am Kang Kang	Java	Naive
2671	Backtrack and recommit commit		Easy
2672	Image reading and saving based on Matplotlib		Easy
2673	Subplotting based on Matplotlib		Easy
2674	Creating a simple SQL View (I)		Medium
2675	Date format conversion	Java	Naive
2676	Creating a simple SQL View (II)		Medium
2677	Advanced plot() function - Customizing the output style		Easy
2678	Split a large file into multiple small files		Naive
2679	Display String (ii)		Naive
2680	Predictive classification of iris dataset based on sklearn's stacking algorithm		Easy
2681	Display String (iii)		Naive
2682	The Nth day of the year	Java	Naive
2683	Zhang San's MySQL Learning Path (I)		Hard
2684	Making a cup of coffee	Java	Easy
2685	Zhang San's MySQL Learning Path (II)		Hard
2686	Bar plotting based on Matplotlib		Easy
2687	Scatter plotting based on Matplotlib		Easy
2689	Redefining the teachers view		Easy
2690	Exception Capture I	Java	Naive
2691	View file details		Naive
2692	Count the total number of students taught by each faculty member		Easy
2693	File creation preset permissions		Naive
2694	Print the upper and lower case alphabet	Java	Naive
2695	Retrieves the specified items of a document by different delimiters		Naive
2696	Cache and restore across branches		Naive
2697	Find a compliant document (i)		Naive
2698	Find a compliant document (ii)		Naive
2699	Exception Capture II	Java	Naive
2700	Update Linghu Chong's age by view		Easy
2701	Remove documents		Easy
2702	Delete Linghu Chong's teacher data by view		Easy
2703	Decision making using adaboost algorithm based on sklearn API		Naive
2704	Zhang San's MySQL Learning Path (III)		Hard
2705	Show view in the current database		Easy
2706	Renaming views (I)		Easy
2707	Renaming views (II)		Easy
2708	Drop View (I)		Easy
2709	Drop View (II)		Easy
2710	Copy Files (i)		Naive
2711	Move documents		Naive
2712	View the type of command		Naive
2713	Find the location of the command		Naive
2714	Implementation of gradient boosting decision tree (GBDT) for breast cancer disease prediction		Medium
2715	View Processing Algorithm Merge		Easy
2716	View Processing Algorithm TEMPTABLE		Easy
2717	Serialized attention status		Easy
2718	Define friend relationship pager		Easy
2719	Execute expression		Naive
2720	Creating a view that ensures consistency (I)		Easy
2721	Creating a view that ensures consistency (II)		Easy
2722	Implement Random Forest based on sklearn		Easy
2723	Showing the definition of a view		Easy
2724	Cascade checking of views		Easy
2725	Local checking of views		Easy
2726	File View		Naive
2727	Compare document differences by column (ii)		Naive
2728	Implement tweet paging function		Medium
2729	Writing to a file		Easy
2730	Delete file contents		Easy
2731	Inject like information and comment information into the Tweet API		Medium
2732	View submission history		Naive
2733	Replacement and presentation of document content in rows		Easy
2735	Realize the paging function of new things		Medium
2736	Document content sorting(i)		Naive
2737	Document content sorting(ii)		Naive
2738	Document content sorting(iii)		Naive
2739	Remove duplicate lines in the file		Naive
2740	Expression evaluation (I)		Naive
2741	Tagging		Easy
2742	Expression evaluation (II)		Naive
2743	Expression evaluation (III)		Naive
2744	Cache people who are following		Medium
2745	Use the cache to determine whether the function has been followed		Medium
2746	Formatted view of historical submission records		Naive
2747	Caching user information		Medium
2748	Implement user cache invalidation function		Medium
2750	Define a general cache helper		Medium
2751	Convert a file from lowercase to uppercase		Naive
2752	Word counts		Naive
2753	Word counts(ii)		Naive
2754	Set command aliases		Naive
2755	View System Information		Naive
2756	View itinerary		Naive
2757	Setting up the shell		Naive
2758	Input and output redirection		Naive
2759	The range of Integer values	Java	Easy
2760	Understanding SQL Procedures (I)		Easy
2761	Understanding SQL Procedures (II)		Easy
2793	Execute the command in the variable		Naive
2794	Execute the command in the variable(ii)		Naive
2795	Set Environment Variables		Naive
2796	Shell Resource Settings		Naive
2797	Setting and deleting variables		Naive
2798	Aop Simplify Log		Easy
2799	Creating a procedure for inserting data in bulk		Medium
2800	Zhang San's MySQL Learning Path (IV)		Hard
2801	Delete Stored Procedure (I)		Easy
2802	Delete Stored Procedure (II)		Easy
2803	Compressed files		Naive
2804	Unzip the file		Naive
2805	Cache user personalized configuration information		Easy
2806	MySQL Stored Procedure IN Parameters I		Easy
2807	MySQL Stored Procedure IN Parameters II		Easy
2808	MySQL Stored Procedure OUT Parameters I		Easy
2809	MySQL Stored Procedure OUT Parameters II		Easy
2810	MySQL Stored Procedure INOUT Parameters I		Easy
2811	MySQL Stored Procedure INOUT Parameters II		Easy
2812	MySQL Stored Procedure Variables I		Easy
2813	Find the sum of even numbers 1 - 100	Java	Naive
2814	ASCII code corresponding characters (Java version)	Java	Naive
2815	How long your savings will last	Java	Naive
2816	Han Xin points out the troops	Java	Naive
2817	Interconversion of doubles and strings	Java	Easy
2818	Find the sum of the inverse diagonals of an array	Java	Easy
2819	Determining prime numbers	Java	Easy
2820	Sum of small numbers	Java	Easy
2821	The disappearing number 6	Java	Naive
2822	Truncate the character with subscript 5	Java	Naive
2823	What Triangle is this	Java	Easy
2824	Encrypted love letters	Java	Easy
2825	Determine if strings are equal	Java	Naive
2826	Friends of Number 2	Java	Easy
2827	Change string	Java	Naive
2828	Splice strings and change to uppercase	Java	Naive
2829	Simple cell phone number verification	Java	Naive
2830	Disappearing strings	Java	Naive
2831	Inverted strings	Java	Naive
2832	A simple check of the mailbox format	Java	Easy
2833	Compliant figures	Java	Naive
2834	Simple string splitting	Java	Easy
2835	Find the maximum and minimum values of two numbers	Java	Naive
2836	Find the maximum value	Java	Naive
2837	Copy the specified element	Java	Naive
2838	Randomly generated numbers	Java	Naive
2840	Simple string matching and replacement	Java	Easy
2841	Please connect the charger	Java	Naive
2842	The constructor without parameters (I)	Java	Naive
2843	The constructor without parameters (II)	Java	Naive
2844	Superfly	Java	Naive
2845	Custom Exceptions - Java	Java	Naive
2846	Reasonable permissions	Java	Easy
2847	Teachers giving lessons to students	Java	Easy
2848	Refining the right class	Java	Naive
2849	Inverted arrays	Java	Naive
2850	The constructor with parameters (I)	Java	Naive
2851	New friends at the zoo	Java	Naive
2852	Additional properties and methods of the Student class	Java	Naive
2853	Common singleton pattern Class	Java	Easy
2854	Custom annotations		Easy
2855	The constructor with parameters (II)	Java	Easy
2856	Create Person abstract class	Java	Easy
2857	Abstract Factory Pattern		Medium
2858	The wheels of the car	Java	Naive
2859	Student implement 2 interfaces	Java	Naive
2860	Implementing the interface	Java	Easy
2861	Ride payment prompt (Interpreter Pattern)		Medium
2862	Calling internal classes	Java	Naive
2863	Are the two people with the same name	Java	Easy
2864	A week of rest day (I)	Java	Easy
2865	Anonymous internal classes	Java	Naive
2866	A week of rest day (II)	Java	Easy
2867	A week of rest day (III)	Java	Easy
2868	All objects	Java	Naive
2869	Managing Books	Java	Naive
2870	Variables of the interface	Java	Naive
2871	Initialize class properties	Java	Naive
2872	static Loaded code block	Java	Naive
2873	Check code (I)	Java	Easy
2874	Local Internal Classes	Java	Naive
2875	Program results	Java	Naive
2876	Sum of extreme differences	Java	Naive
2877	Delete the smallest value in the set	Java	Naive
2878	3 and multiples of 3	Java	Naive
2879	Output all key-value pairs in a Map	Java	Naive
2880	AddData to a Map	Java	Easy
2881	The largest number	Java	Easy
2882	Honor roll for final exams	Java	Easy
2883	A general commodity class	Java	Medium
2884	A week of rest day (IV)	Java	Easy
2885	Roster of classes	Java	Naive
2886	Sorting a Map	Java	Naive
2887	Student set with double sort	Java	Easy
2888	Arrays merge	Java	Naive
2889	Summation of arrays	Java	Naive
2890	Alphabetical order	Java	Naive
2891	Filtering elements in a collection	Java	Naive
2892	Accessing elements	Java	Naive
2893	Arrays with duplicate numbers	Java	Easy
2894	Order by frequency	Java	Medium
2895	Sum of two numbers II	Java	Naive
2896	Use of generic classes	Java	Naive
2897	Intercepting data using Queue	Java	Easy
2898	Intercepting data using Stack	Java	Easy
2899	LinkedList implementation of string reversal output	Java	Naive
2900	LinkedList Removal of duplicate elements	Java	Naive
2901	Array Copy	Java	Naive
2902	Seating in order on the bus	Java	Medium
2903	Use of generalized arrays	Java	Easy
2904	Use of Generic Types	Java	Easy
2905	Upper and lower bounds for generic types	Java	Naive
2906	Thread-safe List	Java	Easy
2907	A week of rest day (V)		Medium
2908	Replace Kth string		Naive
2909	Reverse String in K-Group		Easy
2910	Add a first level title Hello LintCode!	HTML	Naive
2911	Adding class names	HTML	Naive
2912	Production submission section	HTML	Naive
2913	Colours in HTML	CSS	Naive
2914	Writing an Ordered List	HTML	Naive
2915	Adding CSS Styles	CSS	Naive
2916	Writing an Unordered List	HTML	Naive
2917	[Exercise] Logical operations between two variables		Naive
2918	Formatting Old Poems	CSS	Naive
2919	Integer Operations 2		Naive
2920	Get the input data and print it		Naive
2921	Completing the Navigation Menu with Tab Nesting	HTML	Naive
2922	Make a Menu	CSS HTML	Easy
2923	Define a list		Naive
2924	Define strings and numbers and print them		Naive
2925	Define a tuple		Naive
2926	Retrieve the month in the date string and add one（I）		Naive
2927	Number Classification		Naive
2928	Finding Common Multiples		Naive
2929	Find the most expensive items (list version)		Naive
2930	Writing a list to a file		Naive
2931	Read the dictionary from the file and modify it		Naive
2932	Print Student Grade Point Average		Naive
2933	Print student grade point average (exception version)		Easy
2934	Read csv file and modify		Easy
2935	The Disappearing Box	CSS	Naive
2936	Handling Overflow Content	CSS	Naive
2937	The rightmost 1 of a binary number		Medium
2938	Complete the chain table class (I)		Medium
2939	Complete the chain table class (II)		Easy
2940	Byte string and string interconversion		Naive
2942	Blocking people on the blacklist		Naive
2943	Making a Name Entry Box	HTML	Naive
2945	Modifying the Style of In-Line Phrases	CSS	Naive
2946	Positioning Sub-packagings	CSS	Naive
2947	Determine if it is in the list		Naive
2948	Discounts for members		Naive
2949	Find the number that appears an odd number of times		Easy
2950	Check if it is the same object		Naive
2951	Find a right-angled side of a right triangle		Naive
2953	Implementing Button Styles		Naive
2955	Getting to know python deep and shallow copies		Naive
2956	Determine if a discount is available		Naive
2957	Setting the Type of the Input Element		Naive
2958	Fetch the numbers in the list for operation		Naive
2959	Find the average of the maximum values in each list		Easy
2960	Define a function		Naive
2961	Formatting Ancient Poems II	CSS	Naive
2962	Initializing CSS	CSS	Naive
2963	Colourful Input Boxes	CSS	Naive
2965	Modifying the Mouse Cursor Style	CSS	Naive
2966	Adding Text and Box Shadows		Naive
2967	Colourful Buttons	CSS	Naive
2968	Text Omitted if Out of Width	CSS	Easy
2971	Making of the Heart	CSS	Easy
2972	Modify Opacity		Naive
2973	Relationship Selectors	CSS	Naive
2974	The Relationship Selector II	CSS	Naive
2975	Stylized Buttons	CSS	Easy
2976	Adding a Progress Bar	CSS HTML	Naive
2977	The Link Jump	HTML	Naive
2978	Modifying the Outer Shape of a Figure	CSS	Naive
2980	Setting the Margins of Boxes II	CSS	Naive
2981	Different Rounded Corners	CSS	Naive
2982	The Tenth Row that Never Goes	CSS	Naive
2983	The Cool Button	CSS	Naive
2984	Moving Black Blocks		Naive
2986	Units in CSS	CSS	Naive
2987	Selecting dishes	HTML	Naive
2988	Units in CSS II		Naive
2989	Choose a Favourite Course	HTML	Easy
2990	The Cool Box	CSS	Naive
2991	Adjusting Paragraph Size	CSS	Naive
2992	Revising the Outline of a Paragraph		Naive
2993	Making a Christmas Tree	CSS	Naive
2994	Modifying the Alignment of Paragraphs	CSS	Naive
2995	Choose Your Favorite Animal		Naive
2996	Making a Student Information Form	CSS HTML	Naive
2997	Modifying Case	CSS	Naive
2998	Making a Horizontal Navigation Bar	CSS HTML	Easy
2999	Making a Vertical Navigation Bar		Easy
3000	Making a Horizontal Navigation Bar (II)	CSS	Naive
3001	Modifying Character Spacing		Naive
3002	Modifying Paragraph Indentations	CSS	Naive
3003	The Dazzling Text	CSS	Naive
3004	Revising Poetry Row High	CSS	Naive
3005	Labels in Colour	CSS	Naive
3006	Making a Note	CSS	Naive
3007	Selecting Brother Headings and Paragraphs	CSS	Naive
3008	The Box That Got Bigger	CSS	Naive
3009	Crossing the Street	CSS	Naive
3010	Modifying the Boldness of Fonts		Naive
3012	Making CSS Box Model		Easy
3013	The Many Ways to Distribute Left and Right	CSS	Easy
3014	Making a Horizontal Navigation Bar III	CSS	Easy
3015	Changing the Point of Origin	CSS	Naive
3017	Modifying Text Size	CSS	Naive
3018	Setting the Background Pattern Style	CSS	Naive
3019	Modify Picture Style	CSS HTML	Naive
3020	The Cutting Box	CSS	Naive
3021	Choosing a Favourite Critter II	HTML	Easy
3022	Making the Dice	CSS	Easy
3023	The Extra Long Word	CSS	Naive
3026	Modifying Boxes Borders	CSS	Naive
3027	Tables for Colour Explosion	CSS	Naive
3029	Modifying the Background Origin	CSS	Naive
3044	Designing a Search Box	CSS HTML	Easy
3048	Making a Login Form	CSS HTML	Easy
3061	Basic structure of HTML	HTML	Naive
3062	Print Hello World!	PHP	Naive
3063	HTML Page Title Tag	HTML	Naive
3064	Data Portfolio	PHP	Naive
3065	Basic syntax of HTML	HTML	Naive
3067	Easy Calculator	PHP	Naive
3068	Exchange variables	PHP	Naive
3069	Custom text content tags span	HTML	Naive
3070	Progressive data	PHP	Naive
3071	Image tags img	HTML	Naive
3072	Horizontal line tag hr	HTML	Naive
3073	Hello world!		Naive
3074	Parity judgment	PHP	Naive
3075	Determining leap years (PHP version)	PHP	Naive
3077	Paragraph tag p	HTML	Naive
3078	Write route and view		Naive
3081	Standard input and output statements		Naive
3082	Branching Statements		Naive
3083	Custom Tag div	HTML	Naive
3084	Loop statements		Naive
3085	Introduction to Functions		Naive
3086	Month days judgment	PHP	Naive
3087	Frame tag iframe	HTML	Naive
3088	Score Leveling	PHP	Naive
3089	Variable definition exercise		Naive
3090	Common Structured Element Tags	HTML	Easy
3091	Maximal Convention (php version)	PHP	Naive
3092	Summation (PHP version)	PHP	Naive
3093	Han Xin Points (PHP version)	PHP	Naive
3094	Calculate the area of a circle		Easy
3095	Is it a letter?		Easy
3096	Is it a leap year?		Easy
3097	The sum of numbers that are not divisible by 7	PHP	Naive
3098	Button tag button	HTML	Naive
3099	Implement Polls application Model		Easy
3100	Text field tag textarea	HTML	Naive
3101	Make the model modifiable in admin		Naive
3102	Binary digits of an integer		Easy
3103	Write URLconf		Easy
3104	Drop-down menu tag select	HTML	Naive
3105	Take absolute value		Easy
3106	Label wrap input box label	HTML	Naive
3107	Write URLconf (Bug Fix)		Naive
3108	Movie Rating		Easy
3109	Customize background management		Naive
3110	String Splicings	PHP	Naive
3111	String case conversion	PHP	Easy
3112	Printable Ninety-Nine Multiplication Table		Easy
3113	HTML Character Entities	HTML	Naive
3114	Word Searchs	PHP	Naive
3115	Wrong echo string	PHP	Naive
3116	Invalid IP address	PHP	Naive
3118	HTML colors	HTML	Naive
3119	HTML & CSS	HTML	Naive
3120	Thread Control Logic		Medium
3121	Adaptive Access between Company A and Company B		Easy
3122	String escaping	PHP	Naive
3123	Normative words	PHP	Naive
3124	Knock Seven		Easy
3125	Repeat Strings	PHP	Naive
3126	Guess the number		Easy
3127	How many times is 2 squared?		Easy
3132	Summation	PHP	Naive
3133	Remove empty folders		Naive
3134	Is it a prime number?		Easy
3135	CalculatorⅠ		Easy
3136	CalculatorⅡ		Easy
3137	Split tuple		Naive
3138	Number of occurrences of the element in the tuple		Naive
3139	The largest element in the set		Naive
3140	Set Operations		Naive
3141	The sum of the elements in the set whose absolute value is less than 10		Naive
3142	The number of different values in the dictionary		Naive
3143	Dictionary size after merging		Naive
3144	Replace list elements according to dictionary		Naive
3145	Creating arrays	PHP	Naive
3146	First and last numbers	PHP	Naive
3147	Ordered arrays	PHP	Naive
3148	Using lambda function to construct quadratic polynomial with one variable		Naive
3149	Add the two numbers together		Naive
3150	Array length	PHP	Naive
3151	Most frequently occurring words	PHP	Naive
3152	String conversion	PHP	Naive
3153	Deck Generation		Medium
3154	Discounted Travel with Transit Card		Naive
3155	package file		Naive
3156	Area of a circle (macro definition)		Naive
3157	Unzip the zip file		Naive
3158	Using lambda function to get sum of list		Easy
3159	True or False Number	PHP	Naive
3160	Middle Numbers	PHP	Naive
3161	Summation of integer arrays	PHP	Naive
3162	Sort members by age		Naive
3163	The maximum value of the array	PHP	Naive
3164	Rename the imported file with the same name		Naive
3165	Pointer exercise		Naive
3166	Sum the absolute values of two numbers (Python version)		Naive
3167	Alternating sums (Python version)		Naive
3168	Addition, subtraction, multiplication and division two numbers		Naive
3169	Collatz conjecture (Python version)		Naive
3170	Find the first integer whose square is greater than n		Naive
3171	Find the number in 1 - n that can be divided by x		Naive
3172	Sum of multiples of 7 with final number of 2 (Python version)		Naive
3173	Adding two numbers (pointer and reference)		Easy
3174	The number of elements whose value is a multiple of its index (Python version)		Naive
3175	Number of tuples that form a triangle		Naive
3176	Print the noon time point of the corresponding date		Naive
3177	Definition of functions	PHP	Naive
3178	Exchange of numbers	PHP	Naive
3179	Parameter Printing	PHP	Naive
3180	String flipping	PHP	Naive
3181	Anonymous functions	PHP	Naive
3182	Callback functions	PHP	Naive
3183	Ten years later	PHP	Naive
3184	Date Formatting	PHP	Naive
3185	Get the timestamp of the date	PHP	Naive
3186	Definition of Class	PHP	Naive
3187	Student Information	PHP	Naive
3188	Create constructor	PHP	Naive
3189	Define a subclass	PHP	Naive
3190	Save student information	PHP	Easy
3191	Definition of abstract classes	PHP	Naive
3192	Implementation of the interface	PHP	Naive
3193	Delete message prompt	PHP	Naive
3194	Calling a method that does not exist	PHP	Naive
3195	Confirming the identity of the class	PHP	Naive
3196	Division operations	PHP	Naive
3197	Custom Exception Classes	PHP	Naive
3198	Invalid objects	PHP	Naive
3199	Customized error handling	PHP	Naive
3200	Accessing arrays		Naive
3201	Accessing two-dimensional arrays		Naive
3202	Array traversal		Naive
3203	Accessing character arrays		Easy
3204	Character arrays to size		Easy
3205	String-to-Size		Easy
3206	String Slicing		Easy
3207	Adding elements		Naive
3208	String splitting		Easy
3209	Moving fruit		Medium
3210	Train access		Medium
3211	Queue		Naive
3212	Is there this student?		Naive
3213	Define the student structure		Naive
3214	Read student information		Easy
3215	Pointer traversal of arrays		Easy
3220	Define The Student Model I		Naive
3227	Define The Book Model II		Naive
3228	Output ASCII values of input lowercase letters in sequence		Naive
3229	Define The Book Model I		Naive
3230	Find duplicate mailboxes		Naive
3231	Define The Student Model II		Naive
3232	Implement Class application Model		Naive
3239	Update the table contents and output the updated table		Naive
3240	Count the number of Letters of each type	Java	Easy
3241	Query the number of students for the web course		Naive
3242	Print "LintCode"	Java	Naive
3243	Equivalent String		Easy
3244	Implement Band application Model		Easy
3247	Design Time Class		Naive
3263	Sort Student models		Naive
3267	Design Circle Related Methods		Naive
3269	Set joint constraints on Student model		Naive
3278	Format Book read count		Naive
3279	Show book name and author		Naive
3285	Print Encapsulated Student Information		Naive
3298	Inherit and Print Student Information		Naive
3300	Using the Transportation Method		Naive
3324	Tree-shaped Relationships within the Company		Easy
3327	Fast Food Ordering System		Medium
3329	PC Peripheral Accessor (Java)		Medium
3330	Fitness Course Builder (Java)		Easy
3331	Contracting of Actors		Easy
3332	Different Drinking Experience		Naive
3333	Singleton Pattern Using Enumerations (Java)		Easy
3334	Package Clone		Naive
3336	Multimedia Playback Adapter (Java)		Medium
3338	File System Design		Medium
3340	Tool to Determine If String Is Empty		Naive
3341	Restore Game Archive		Easy
3344	Using the Shape Factory to Calculate the Area of Various Shapes OOD		Easy
3345	Initialize the Person Class		Naive
3349	Initialize the Animals Class (C++)		Naive
3350	Abstract Factory for Making Milk Tea (Java)		Medium
3354	Application of Synchronized - Alternate Printing		Easy
3356	Equivalent String (Python)		Easy
3357	Print Student Information		Naive
3364	Application of Keyword Volatile - Printing Incremental Numbers		Easy
3365	Rewrite the model save() method		Easy
3366	Implement Restaurant application Model		Easy
3367	Create Model - Custom Manager		Easy
3368	Sorting String With Lambda Expression	Java	Easy
3369	Create Model - Add Model Method		Easy
3370	Create a User Object		Naive
3371	Modify all book information		Easy
3372	Query the book information of the specified author name		Easy
3373	Check the author of books and sort in descending order		Easy
3374	Query the information of the first n books in the order of reading times		Easy
3375	Query the student information according to the score range and sort it in ascending order		Easy
3376	Check the information of students whose test score are greater than or equal to N times the general score		Easy
3377	Wrapping of Animals Class (C++)		Naive
3378	Sort student information in ascending order by total score		Easy
3379	Designing the Person Class		Naive
3380	Check the information of students whose general score and test score are greater than or equal to 60		Easy
3381	Check the information of students whose general score or test score are greater than or equal to a specific value		Easy
3382	Update the course total score of all students		Easy
3383	Update and query the student information of the specified conditions		Medium
3384	Delete student information according to sno		Easy
3385	Delete associated model objects according to keywords		Hard
3386	Query the information of students passing the course		Hard
3387	Query the information of n students who passed the course but whose scores are reciprocal		Easy
3390	Custom Templates		Easy
3392	Control Smart Curtains (Java)		Easy
3395	Menu of Various Permissions OOD (Java)		Medium
3398	Shared Website Templates (Java)		Medium
3400	Perimeter and Area of a Square		Naive
3402	Linked List Instantiation		Easy
3404	Online Coffee Shopping Platform		Medium
3405	Web Server Configuration Whitelist		Easy
3407	Fire Alarm		Easy
3408	Queue Instantiation		Easy
3410	Game Progress Saving (Python)		Easy
3411	Mediator of Housing Rental (Java)		Medium
3412	Approval Chain for Leave Requests (Java)		Medium
3413	Digital Wallet		Medium
3414	Issuance and Execution of Tasks		Medium
3417	Analog Guitar		Easy
3418	Pharmacy Business System		Medium
3419	Elevator Controller		Easy
3421	A Design of Student Course Selection System (Java)		Hard
3422	Brush and Shape		Medium
3423	Beverage Refilling Business		Easy
3424	Python Implementation Stack		Naive
3425	Multi-person Self-introduction		Easy
3426	Output of The Number of Objects		Naive
3427	Furniture Placement Problem		Easy
3428	Company Leave Request System		Medium
3429	Recommended Merchants (Java)		Hard
3430	A Design of Unmanned Vending Supermarket (Java)		Hard
3431	Designing Company Organization Structure		Medium
3432	Restaurant Ordering System		Hard
3433	Stock Inquiry Client		Easy
3435	Determining the Relationship between Circle and Point		Easy
3436	The Magician Exchanges the Poker in both Hands		Easy
3437	Performance of Multiple Instruments		Naive
3438	Warehouse Management System		Hard
3439	Serialized User Model and Group Model		Naive
3440	Implementation of User Model and Group Model ViewSet		Naive
3441	Registered User and Group ViewSet Routing		Naive
3442	Serialized Blog Model		Easy
3443	Serialized Blog Model II		Easy
3444	Implement Blog View Function		Easy
3445	Implement Blog View Function II		Easy
3446	Automatic Coffee Maker		Easy
3447	Implement Blog View Class		Easy
3448	Implement Blog View Class II		Easy
3449	Automatic Coffee Maker II		Easy
3450	Implement Blog application view class		Medium
3451	Stock of Vending Machines		Easy
3452	Add Blog Application View Class Permissions		Hard
3453	Create Hyperlink Path		Medium
3454	Fruit Packaging Factory		Easy
3455	Iterator for Linked List		Easy
3456	Receptionist at Pet Store		Easy
3457	Create a Thread to Splice Words		Naive
3458	Print Hello LintCode in Thread		Naive
3459	Stop a Running Thread		Naive
3460	Determine If a Thread Is Stopped		Naive
3461	Creation of Multitasking Threads		Easy
3462	Thread’s Working Ways		Naive
3463	Putting Thread to Sleep		Naive
3464	Custom Thread Wrapper		Easy
3465	Force a New Thread to Execute		Naive
3466	Changing the Priority of a Thread		Naive
3467	Create a Daemon Thread		Naive
3468	Thread Passing Parameters		Naive
3469	Transfer Thread Ownership		Naive
3470	Swap Thread		Naive
3471	Data Concurrent Modification Protection		Naive
3472	Remove the Deadlock Relationship		Naive
3473	Timeout Attempt on Mutex		Naive
3474	Box for Storing Data from Different Threads		Easy
3475	Incrementing and Modifying Values in an Array at the Same Time		Easy
3476	Print Values in Two Arrays Alternately		Easy
3477	1 Producer and 1 Consumer		Easy
3478	Create a Thread Pool to Perform a Specified Amount of Tasks		Easy
3479	Shutdown the Thread Pool		Naive
3480	Complete Array	Python	Easy
3481	Find the Index of the Maximum Value		Easy
3482	The Only Thread-safe Call		Naive
3483	Create an Asynchronous Task		Naive
3484	Create a Custom Thread Pool to Execute Tasks		Easy
3485	Asynchronous Result Sharing		Naive
3486	Customizing Thread Pool Rejection Policy		Easy
3487	Custom Asynchronous Results		Naive
3488	Print in Order		Easy
3489	Convert Asynchronous Tasks		Naive
3490	Synchronization of Workers' Tasks		Easy
3491	Synchronization of Workers' Tasks II		Easy
3492	Design of the Spinlock		Naive
3493	Longest Subarray		Medium
3494	Simulation of Station Gates		Easy
3495	Family Fruit		Medium
3496	Family Fruit II		Hard
3497	Print Values of Two Arrays Alternately II		Easy
3498	Supply Products		Medium
3499	Supply Products II		Medium
3500	Dividing Line		Easy
3501	The best sales		Easy
3502	Implementation of CountDownLatch		Easy
3503	Supply Products III		Medium
3504	Implementation of Semaphore		Easy
3505	Product Combination		Medium
3506	Implementation of Barrier		Easy
3507	Compute and Remove Spaces from a String		Naive
3508	First-Come First-Served		Easy
3509	Implementation of CyclicBarrier		Medium
3510	Display Full Name Synchronously		Easy
3511	Implementing a Message Pop-Up Component		Easy
3512	Implementation of the TODO List		Medium
3513	Implementation of the TODO List II		Hard
3514	Shortest Job First		Medium
3515	Highest Response Ratio Next		Medium
3516	Shortest Remaining Time Next		Hard
3517	Implementation of Parallel Search Algorithm		Medium
3518	Solving for roots and powers of positive integers		Naive
3519	Average Salary		Naive
3520	Implementation of Parallel Bubble Sort Algorithm		Easy
3521	Control Style Scopes		Naive
3522	Hello Vue		Naive
3523	Vue Class Bindings		Naive
3524	Render All List Elements		Naive
3525	Vue Style Bindings		Naive
3526	Dependency Injection (Provide)		Easy
3527	Dependency Injection (Injection)		Easy
3528	Transition Effect		Medium
3530	Process List And Render		Naive
3531	Vue Conditional Rendering		Naive
3532	Vue Conditional Rendering II		Naive
3533	Design Data Self-Increment And Self-Decrement Buttons		Naive
3534	Teleport		Medium
3535	Use of Text Interpolation		Naive
3536	Insert Raw HTML Code		Naive
3537	Make Form Text Box		Naive
3538	Sort and Filter Grid Component Implementation		Hard
3539	Make Form Selection Box		Naive
3540	Bind Click Event to Buttons		Naive
3541	Tree View Component Implementation		Hard
3542	Non-Negative Prefix Sum		Easy
3543	Dynamically Bind Class Names for Paragraphs		Naive
3544	Exam Progress	TypeScript	Easy
3545	Vue Props		Easy
3546	Dynamically Bind Styles for Paragraphs		Naive
3547	Matrix Override		Medium
3548	Vue Slots		Naive
3549	Vue Emits		Easy
3550	Vue Dynamic Components		Easy
3551	Vue Global Component Registration		Easy
3552	Interesting Triples		Medium
3553	Importing Components		Naive
3554	Default & Named Slots		Easy
3555	Defining and Using Components		Naive
3556	Scoped Slots		Easy
3557	Counting Button Clicks		Easy
3558	Vue Local Component Registration		Easy
3559	Customized Subcomponents		Easy
3560	Bind Keyboard Events to Input Boxes		Naive
3561	Form Input Bindings		Naive
3562	Single-File Component		Naive
3563	Component Two-Way Binding		Naive
3564	List and Object Traversal		Naive
3565	Polling Display Title		Naive
3566	Local Registration of Components		Naive
3567	Global Registration of Components		Naive
3568	Provide		Naive
3569	Inject		Naive
3570	Computed		Naive
3571	Named Slot		Naive
3572	Slot		Naive
3573	Transition Style Binding		Naive
3574	List Transition Animation		Naive
3575	Dynamic Components		Naive
3576	Add Data to Button Component		Naive
3577	Define Properties of the Component		Naive
3578	KeepAlive		Naive
3579	Caching Components and Switching Between Them		Easy
3580	Implementing Content Polling Button		Naive
3581	External Teleport		Naive
3582	A Fake Counter		Naive
3583	Watch Property		Naive
3584	Observing the Impact of Quantity Changes in the Shopping Cart		Easy
3585	Calculate Average and Array Sum		Naive
3586	Virtual DOM		Naive
3587	Render Functions		Naive
3588	Priority of Rendering Options		Naive
3589	Use ref(), toRef(), and unref() to Manage Data		Easy
3590	Count the Number of Characters		Naive
3591	Basic Use of Mixins		Easy
3592	Customized Commands		Naive
3593	Record List Element Log		Easy
3594	Implementation of Multiple Delete Function in Table		Easy
3595	Deserialize Binary Tree		Medium
3596	Order Volume for Each Time Period		Medium
3597	Lowest Common Ancestor IV		Hard
3598	Sum of Two Linked Lists	TypeScript	Easy
3599	Remove Repeated Letters		Medium
3600	Fix Binary Search Tree		Medium
3601	Cumulative Number	TypeScript	Medium
3602	The Largest Sum Divisible by Three	TypeScript	Medium
3603	Longest Nice Subarray		Medium
3604	The Minimum String After Swapping		Medium
3605	Shift 2D Grid		Easy
3606	Query the Middle Node ID		Medium
3607	Number of Students Passing the Exam		Easy
3608	Overall Approval Rate of Friend Requests		Medium
3609	Who Has the Most Friends		Medium
3610	Courses Taken by All Students		Easy
3611	My Best Friend		Medium
3612	Product Prices for the Specified Date		Medium
3613	Search For Students Ranked Second to Fifth		Easy
3614	Check the Referrals of Customers		Easy
3615	Data Median		Medium
3616	Combined Course Transcripts		Easy
3617	Replacement of Seats for Two Consecutive Persons		Medium
3618	Time-Consuming Top Three Tasks		Easy
3619	Project Subtask		Hard
3620	Logger Rate Limiter		Easy
3621	Fixed Point	TypeScript	Easy
3622	Read N Characters Given Read4		Easy
3623	Sum of Digits in the Minimum Number	TypeScript	Easy
3624	Count Substrings with Only One Distinct Letter	TypeScript	Easy
3625	Index Pairs of a String		Medium
3626	How Many Apples Can You Put into the Basket	TypeScript	Easy
3627	Find All The Lonely Nodes	TypeScript	Easy
3628	Highest Five Subject Average	TypeScript	Easy
3629	Intersection of Three Sorted Arrays	TypeScript	Easy
3630	Two Sum Less Than Target	TypeScript	Easy
3631	Remove Vowels From String	TypeScript	Easy
3632	Delete n Nodes After m Nodes of a Linked List	TypeScript	Easy
3633	Missing Number In Arithmetic Progression	TypeScript	Easy
3634	Largest Unique Number	TypeScript	Easy
3635	Largest Subarray Length k	TypeScript	Easy
3636	Array Transformation	TypeScript	Easy
3637	Problematic Sensor		Easy
3638	Single-Row Keyboard	TypeScript	Easy
3639	Check If a String Be Split into Value-Equal Substrings	TypeScript	Easy
3640	Hexspeak	TypeScript	Easy
3641	Sport Plan Performance	TypeScript	Easy
3642	Counting Elements	TypeScript	Easy
3643	Whether the Array Is a Consecutive Array	TypeScript	Easy
3644	Check If a Number is Majority Element in an Array	TypeScript	Easy
3645	Perform String Shifts	TypeScript	Easy
3646	Count Houses on a Circular Street		Easy
3647	Design Compressed String Iterator	Java	Easy
3648	Reverse Words in a String IV		Medium
3649	Find the Sum of Two Nodes of Two BST	TypeScript	Medium
3650	Absolutely Continuous Numbers	TypeScript	Medium
3651	Number of Connected Components in an Undirected Graph	TypeScript	Medium
3652	Shortest Way to Form String	TypeScript	Medium
3653	Meeting Scheduler		Medium
3654	Toss Coins		Medium
3655	Minimize Rounding Error to Meet Target		Medium
3656	Design Snake Game		Medium
3657	All Paths Can Pass from Start to End		Medium
3658	Website Crawler		Medium
3659	Design Phone Directory	Java	Easy
3660	Competition Leaderboard		Medium
3661	Missing Element in Sorted Array		Medium
3662	Design Hit Counter	Java	Easy
3663	Diameter of an Undirected Tree		Medium
3664	Longest Repeating Substring		Medium
3665	Inorder Successor in BST II		Medium
3666	Campus Bikes II		Hard
3667	Encode Number	TypeScript	Medium
3668	Bracket Expansion	TypeScript	Medium
3669	Smallest Common Region		Medium
3670	The Earliest Moment When Everyone Become Friends		Medium
3671	Replace the Synonyms in the Sentence		Medium
3672	Connecting Cities With Minimum Cost		Medium
3673	Parallel Courses		Medium
3674	Printing Immutable Linked List in Reverse Order	Python	Medium
3675	Minimum Swaps to Group All 1's Together	TypeScript	Medium
3676	Analyze User Website Visit Pattern		Medium
3677	Design File System		Medium
3678	Delete Interval		Medium
3679	Shortest Distance to Target Color	TypeScript	Medium
3680	Before and After Puzzle	TypeScript	Medium
3681	Delete Nodes of Tree		Medium
3682	Knight Shortest Path IV		Medium
3683	Columns with at Least a One on the Leftmost Side		Medium
3684	Find Smallest Common Element in All Rows	TypeScript	Medium
3685	First Unique Integer		Medium
3686	Diameter of N-Ary Tree		Medium
3687	Check If an Array Is a Valid Sequence	TypeScript	Medium
3688	Strings Differ by One Character	TypeScript	Medium
3689	Put Boxes Into the Warehouse		Medium
3690	Clone Binary Tree II		Medium
3691	Dot Product of Two Sparse Vectors	Python	Easy
3692	Put Boxes Into the Warehouse II		Medium
3693	Clone N-branch Tree		Medium
3694	Nonnegative Subarray	TypeScript	Easy
3695	Nonnegative Subarray II	TypeScript	Medium
3696	Inverse Subarray	TypeScript	Easy
3697	Find Subscripts	TypeScript	Easy
3698	The Leftmost Smaller Number	TypeScript	Easy
3699	Clear the String		Medium
3701	Find Nearest Right Node in Binary Tree	Python	Medium
3702	Maximum Sum Queries		Hard
3703	Count Number of Rectangles Containing Each Point		Medium
3704	Count Good Triplets in Array		Hard
3705	Minimum Moves to Make Array Complementary		Medium
3706	Number of Pairs That Satisfy the Condition	TypeScript	Hard
3707	Corporate Flight Bookings	TypeScript	Medium
3708	Minimum Number of Increments on Subarrays to Form a Target Array		Hard
3709	Minimum Number of Visited Lattices in a Matrix		Hard
3710	Design Most Recently Used Queue		Medium
3711	Delete the Problem Node in a Binary Tree		Medium
3712	Maximum Subarray Sum After Squaring An Element	TypeScript	Medium
3713	Change the Root of a Binary Tree		Medium
3714	Buildings With an Ocean View	TypeScript	Easy
3715	Lowest Common Ancestor V		Medium
3716	Longest Perfect Palindromic Subsequence		Medium
3717	The Number of Distinct Substrings		Medium
3718	Sort Features by Popularity	TypeScript	Medium
3719	Shortest Path to Get Bubble Tea	TypeScript	Medium
3720	Count Pairs of Equal Substrings With Minimum Difference		Medium
3721	Maximum Number of Study Groups		Medium
3722	Calculate the Distance Between Two Nodes in a Binary Tree	TypeScript	Medium
3723	Remove Duplicates from Unsorted List II	TypeScript	Medium
3724	Distinct Numbers in Each Subarray	TypeScript	Medium
3725	Calculate the Depth of BST Based on the Order of Insertions		Medium
3726	Rotting Oranges	TypeScript	Medium
3727	Shortest Path in the Maze		Medium
3728	Longest Word With All Prefixed		Medium
3729	Implement Trie II	Python	Medium
3730	Product of Two Run-Length Encoded Arrays	TypeScript	Medium
3731	Minimize Product Sum of Two Arrays	TypeScript	Medium
3732	Minimum Path Cost in a Maze		Medium
3733	Count Pairs in Two Arrays	TypeScript	Medium
3734	Cutting Ribbons	TypeScript	Medium
3735	Bash Game II		Medium
3736	Kth Smallest Subarray Sum		Medium
3737	Find Maximum Values Among All Minimum Values of Subarrays		Medium
3738	Longest Common Subsequence Between Sorted Arrays		Medium
3739	Binary Searchable Numbers in an Unsorted Array		Medium
3740	Calculate the Number of Nodes Equal to Sum of Child Nodes	TypeScript	Medium
3741	Widest Pair of Indices With Equal Range Sum	TypeScript	Medium
3742	Maximum Number of People Can Be Caught in a Game	TypeScript	Easy
3743	Smallest Greater Multiple Made of Two Digits	TypeScript	Medium
3744	Calculate the Average Height of Buildings in Each Region		Medium
3745	Brightest Position on Street	TypeScript	Medium
3746	Count the Number of Subarrays Where 1 Appears More than 0	TypeScript	Medium
3747	Maximum Alternating Subarray Sum		Medium
3748	Number of Spaces the Robot Can Clean		Medium
3749	Reorder Absolute Value Linked List	TypeScript	Medium
3750	Minimum Cost of Dividing the Sentence into Lines		Medium
3751	Number of Equal Count Substrings	TypeScript	Medium
3752	Number of Substrings That Start and End with the Same Letter		Easy
3753	Maze of Confusion		Medium
3754	Largest Even Sum of Subsequences with Length K		Medium
3755	Minimum Cost to Reach City With Discounts		Medium
3756	Number of Unique Flavors Remaining After Sharing K Candies		Medium
3762	First C Code: Print Hello World		Naive
3763	C Variable Definition Exercise		Naive
3764	C Variable Definition Exercise II		Naive
3765	Print "Hello World" with Quotation Mark		Naive
3766	A+B in Different Binaries		Naive
3767	Print File Path		Naive
3768	Determine Odd or Even Number		Naive
3769	Judging Leap Year (C version)		Naive
3770	Processing Data		Naive
3771	Reverse Integer (C version)		Easy
3772	Find all the daffodils (C version)		Naive
3773	Print nine-nine multiplication table (C version)		Easy
3774	Determining Prime Number		Easy
3775	Find the Greatest Common Divisor (C version)		Easy
3776	Finding the Least Common Multiples (C version)		Easy
3777	Output Data by Format		Naive
3778	First String Containing Only Letters		Easy
3780	Output The Month According to The Number		Naive
3781	Read Data on Demand		Easy

Name		Name	Last commit message	Last commit date
Latest commit History 1,356 Commits
.github/workflows		.github/workflows
scripts		scripts
src		src
.eslintrc.js		.eslintrc.js
.gitignore		.gitignore
LICENSE		LICENSE
README.md		README.md
package-lock.json		package-lock.json
package.json		package.json
tsconfig.json		tsconfig.json

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