LeetCode Master List

This file consolidates all LeetCode-equivalent problems across various topics in this repository.

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📊 Grand Total LeetCode Questions: 92

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1. Arrays

#	Problem Statement	LeetCode Link
3	Calculate frequency of array	1636. Sort Array by Increasing Frequency
6	Move zero to end in array	283. Move Zeroes
7	Reverse the array	344. Reverse String (related)
8	Rotate array	189. Rotate Array
10	Find majority element in array	169. Majority Element
12	Remove Duplicate from an array	26. Remove Duplicates from Sorted Array
13	Find intersection of two array	349. Intersection of Two Arrays
15	Kaden’s algorithms	53. Maximum Subarray
16	Dutch national algorithms	75. Sort Colors
18	Find missing number	268. Missing Number
19	Maximum sum subarray	53. Maximum Subarray
20	Binary search iterative	704. Binary Search
21	Median of array	4. Median of Two Sorted Arrays
22	All repeating elements	442. Find All Duplicates in an Array
27	Find missing number	268. Missing Number
32	Subarray sum exists	560. Subarray Sum Equals K
34	Search in 2d matrix	74. Search a 2D Matrix
35	Print matrix in spiral manner	54. Spiral Matrix
36	Sort 0 1 and 2	75. Sort Colors
37	Intersection II	350. Intersection of Two Arrays II
43	Generate permutations	46. Permutations
44	Pair with target sum	1. Two Sum

Total Arrays: 22

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2. Problems on Number

#	Problem Statement	LeetCode Link
1	Check Palindrome Number	9. Palindrome Number
3	Check Prime Number	204. Count Primes (related)
5	Armstrong Number	1134. Armstrong Number (Premium)
6	Perfect Number	507. Perfect Number
15	Reverse Digits	7. Reverse Integer
17	Power of Number	50. Pow(x, n)
21	GCD of two numbers	1979. Find Greatest Common Divisor of Array
24	Sum of Digits	258. Add Digits (related)

Total Problems on Number: 8

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3. Strings

#	Problem Statement	LeetCode Link
1	Check string anagram or not	242. Valid Anagram
2	Check string is palindrome	125. Valid Palindrome
3	Reverse the string	344. Reverse String
4	Check string is permutation	567. Permutation in String
5	Reverse without STL	344. Reverse String
6	First occurrence of string	28. Find the Index of the First Occurrence in a String
17	Find non-repeating character	387. First Unique Character in a String
18	Anagram check	242. Valid Anagram
19	Wildcard matching	44. Wildcard Matching
21	Remove duplicates	1047. Remove All Adjacent Duplicates In String
27	Find substring position	28. Find the Index of the First Occurrence in a String
28	Reverse two pointer	344. Reverse String
29	String permutations	46. Permutations (related)
30	Check permutation	567. Permutation in String
31	Brute force string match	28. Find the Index of the First Occurrence in a String

Total Strings: 15

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4. Linked List

#	Problem Statement	LeetCode Link
12	Find the midNode	876. Middle of the Linked List
40	Detect the loop	141. Linked List Cycle
42	Reverse the linked list	206. Reverse Linked List
43	Merge two sorted linked list	21. Merge Two Sorted Lists
44	Check linked list is palindrome	234. Palindrome Linked List
45	Delete the loop	142. Linked List Cycle II (related)
46	Remove duplicate in sorted list	83. Remove Duplicates from Sorted List
47	Intersection of two sorted list	160. Intersection of Two Linked Lists (related)

Total Linked List: 8

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5. Recursion

#	Problem Statement	LeetCode Link
5	Fibonacci series	509. Fibonacci Number
7	Reverse string recursion	344. Reverse String
8	Palindrome string check	125. Valid Palindrome
13	Sum of digits	258. Add Digits (related)
14	Power of number	50. Pow(x, n)
18	Binary search recursion	704. Binary Search
22	String permutations	46. Permutations (related)
23	Merge sort recursion	912. Sort an Array (related)
25	Calculate GCD	1979. Find Greatest Common Divisor of Array (related)

Total Recursion: 9

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6. Searching

#	Problem Statement	LeetCode Link
1	Binary Search	704. Binary Search
2	Search in Rotated Sorted Array	33. Search in Rotated Sorted Array
3	Search in a 2D Matrix	74. Search a 2D Matrix
4	Find First and Last Position	34. Find First and Last Position of Element in Sorted Array
5	Search Insert Position	35. Search Insert Position
6	Peak Index in a Mountain Array	852. Peak Index in a Mountain Array
7	Find Minimum in Rotated Sorted Array	153. Find Minimum in Rotated Sorted Array
8	First Bad Version	278. First Bad Version
9	Sqrt(x)	69. Sqrt(x)
10	Guess Number Higher or Lower	374. Guess Number Higher or Lower

Total Searching: 10

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7. Sorting

#	Problem Statement	LeetCode Link
1	Sort an Array (General)	912. Sort an Array
2	Sort Colors (Dutch National Flag)	75. Sort Colors
3	Insertion Sort List	147. Insertion Sort List
4	Sort List (Merge Sort)	148. Sort List
5	Kth Largest Element	215. Kth Largest Element in an Array
6	Maximum Gap (Radix/Bucket)	164. Maximum Gap
7	Largest Number (Custom Sort)	179. Largest Number
8	Merge Intervals	56. Merge Intervals
9	H-Index	274. H-Index
10	Squares of a Sorted Array	977. Squares of a Sorted Array

Total Sorting: 10

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8. Tree

#	Problem Statement	LeetCode Link
3	Binary Tree Traversal (In/Pre/Post)	94. Inorder, 144. Preorder, 145. Postorder
11	Insert into a Binary Search Tree	701. Insert into a Binary Search Tree
12	Search in a Binary Search Tree	700. Search in a Binary Search Tree
15	Validate Binary Search Tree	98. Validate Binary Search Tree
21	Implement Trie (Prefix Tree)	208. Implement Trie (Prefix Tree)
25	Maximum Depth of Binary Tree	104. Maximum Depth of Binary Tree
25	Minimum Depth of Binary Tree	111. Minimum Depth of Binary Tree
26	Binary Tree Level Order Traversal	102. Binary Tree Level Order Traversal
27	Binary Tree Level Order Traversal II	107. Binary Tree Level Order Traversal II
28	Diameter of Binary Tree	543. Diameter of Binary Tree

Total Tree: 10