Data Structures and Algorithms Journey 🚀

Overview 📚

Welcome to my journey of learning and practicing Data Structures and Algorithms (DSA)! This repository serves as a collection of my notes, practice problems, solutions, and concepts related to DSA. My goal is to master the fundamental building blocks of computer science and improve my problem-solving skills. 💡

Learning Goals 🎯

Understand and implement various data structures (arrays, linked lists, stacks, queues, trees, graphs, heaps, hash tables).
Master essential algorithms (sorting, searching, dynamic programming, greedy algorithms, and graph traversal techniques).
Improve my problem-solving skills and coding efficiency through regular practice and challenges. 💪

Repository Structure 📂

DSA Practice: Problem solutions and coding challenges.
Concept Notes: Detailed explanations of each topic using comments (#) and Readme files.

Progress 📈

As I work through different problems and algorithms, I will be posting my solutions and explanations in this repository. This will be an ongoing project, and I aim to continuously improve my understanding of DSA. 🔥

How You Can Contribute 🤝

Feel free to fork this repository, raise issues, or contribute with suggestions or improvements. If you have any tips or resources to share, don't hesitate to open a pull request! 🙌

Name		Name	Last commit message	Last commit date
Latest commit History 920 Commits
01. Contains Duplicate		01. Contains Duplicate
02. Valid Anagram		02. Valid Anagram
03. Two Sums		03. Two Sums
04. Group Anagrams		04. Group Anagrams
05. Top K Frequent Elements		05. Top K Frequent Elements
06. Products of array except self		06. Products of array except self
07. Valid Sudoku		07. Valid Sudoku
08. Longest Consecutive Sequence		08. Longest Consecutive Sequence
09. Valid Palindrome		09. Valid Palindrome
10. Two Sum II - Input Array Is Sorted		10. Two Sum II - Input Array Is Sorted
100. Pascal's Triangle		100. Pascal's Triangle
101. Next Greater Element I		101. Next Greater Element I
102. Maximum Difference Between Even and Odd Frequency I		102. Maximum Difference Between Even and Odd Frequency I
103. Find Lucky Integer in an Array		103. Find Lucky Integer in an Array
104. Ransom Note		104. Ransom Note
105. Move Zeroes		105. Move Zeroes
106. Squares of a Sorted Array		106. Squares of a Sorted Array
107. Is Subsequence		107. Is Subsequence
108. Score of a String		108. Score of a String
109. Replace Elements with Greatest Element on Right Side		109. Replace Elements with Greatest Element on Right Side
11. 3Sum		11. 3Sum
110. Length of Last Word		110. Length of Last Word
111. Number of Senior Citizens		111. Number of Senior Citizens
112. Unique Email Addresses		112. Unique Email Addresses
113. Isomorphic Strings		113. Isomorphic Strings
114. Can Place Flowers		114. Can Place Flowers
115. Maximum Ascending Subarray Sum		115. Maximum Ascending Subarray Sum
116. Find Pivot Index		116. Find Pivot Index
117. Kth Distinct String in an Array		117. Kth Distinct String in an Array
118. Range Sum Query - Immutable		118. Range Sum Query - Immutable
119. Find All Numbers Disappeared in an Array		119. Find All Numbers Disappeared in an Array
12. Container With Most Water		12. Container With Most Water
120. Maximum Number of Balloons		120. Maximum Number of Balloons
121. Special Array I		121. Special Array I
122. Assign Cookies		122. Assign Cookies
123. Find First Palindromic String in the Array		123. Find First Palindromic String in the Array
124. Sort Array By Parity		124. Sort Array By Parity
125. Monotonic Array		125. Monotonic Array
126. Divide Array Into Equal Pairs		126. Divide Array Into Equal Pairs
127. Palindrome Linked List		127. Palindrome Linked List
128. Number of Good Pairs		128. Number of Good Pairs
129. Count the Number of Consistent Strings		129. Count the Number of Consistent Strings
13. Valid Parentheses		13. Valid Parentheses
130. Largest 3-Same-Digit Number in String		130. Largest 3-Same-Digit Number in String
131. Destination City		131. Destination City
132. Circular Sentence		132. Circular Sentence
133. Maximum Score After Splitting a String		133. Maximum Score After Splitting a String
134. Path Crossing		134. Path Crossing
135. Minimum Changes To Make Alternating Binary String		135. Minimum Changes To Make Alternating Binary String
136. Redistribute Characters to Make All Strings Equal		136. Redistribute Characters to Make All Strings Equal
137. Longest Palindrome		137. Longest Palindrome
138. Largest Substring Between Two Equal Characters		138. Largest Substring Between Two Equal Characters
139. Set Mismatch		139. Set Mismatch
14. Min Stack		14. Min Stack
140. First Unique Character in a String		140. First Unique Character in a String
141. Intersection of Two Arrays		141. Intersection of Two Arrays
142. Find Common Characters		142. Find Common Characters
143. Number of Students Unable to Eat Lunch		143. Number of Students Unable to Eat Lunch
144. Arranging Coins		144. Arranging Coins
145. Valid Perfect Square		145. Valid Perfect Square
146. Time Needed to Buy Tickets		146. Time Needed to Buy Tickets
147. Relative Sort Array		147. Relative Sort Array
148. Remove Linked List Elements		148. Remove Linked List Elements
149. Remove Duplicates from Sorted List		149. Remove Duplicates from Sorted List
15. Evaluate Reverse Polish Notation		15. Evaluate Reverse Polish Notation
150. Minimum Recolors to Get K Consecutive Black Blocks		150. Minimum Recolors to Get K Consecutive Black Blocks
151. Sort the People		151. Sort the People
152. Sort Array by Increasing Frequency		152. Sort Array by Increasing Frequency
153. Minimum Difference Between Highest and Lowest of K Scores		153. Minimum Difference Between Highest and Lowest of K Scores
154. Convert Sorted Array to Binary Search Tree		154. Convert Sorted Array to Binary Search Tree
155. N-ary Tree Postorder Traversal		155. N-ary Tree Postorder Traversal
156. Path Sum		156. Path Sum
157. Take Gifts From the Richest Pile		157. Take Gifts From the Richest Pile
158. Average Waiting Time		158. Average Waiting Time
159. Subarray Sums Divisible by K		159. Subarray Sums Divisible by K
16. Generate Parentheses		16. Generate Parentheses
160. Find Peak Element		160. Find Peak Element
161. Middle of the Linked List		161. Middle of the Linked List
162. Intersection of Two Linked Lists		162. Intersection of Two Linked Lists
163. Make The String Great		163. Make The String Great
164. Get Equal Substrings Within Budget		164. Get Equal Substrings Within Budget
165. Minimum Number of Swaps to Make the String Balanced		165. Minimum Number of Swaps to Make the String Balanced
166. Number of Pairs of Interchangeable Rectangles		166. Number of Pairs of Interchangeable Rectangles
167. Range Sum of BST		167. Range Sum of BST
168. Swap Nodes in Pairs		168. Swap Nodes in Pairs
169. Populating Next Right Pointers in Each Node		169. Populating Next Right Pointers in Each Node
17. Daily Temperatures		17. Daily Temperatures
170. Construct String from Binary Tree		170. Construct String from Binary Tree
171. Bag of Tokens		171. Bag of Tokens
172. Minimum Length of String After Deleting Similar Ends		172. Minimum Length of String After Deleting Similar Ends
173. Fruit Into Baskets		173. Fruit Into Baskets
174. Maximum Number of Vowels in a Substring of Given Length		174. Maximum Number of Vowels in a Substring of Given Length
175. Grumpy Bookstore Owner		175. Grumpy Bookstore Owner
176. Frequency of the Most Frequent Element		176. Frequency of the Most Frequent Element
177. Binary Subarrays With Sum		177. Binary Subarrays With Sum
178. Subarray Product Less Than K		178. Subarray Product Less Than K
179. Length of Longest Subarray With at Most K Frequency		179. Length of Longest Subarray With at Most K Frequency
18. Car Fleet		18. Car Fleet
180. Brick Wall		180. Brick Wall
181. Largest Number		181. Largest Number

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