My solutions of problems from LeetCode

Link to GitHub repository

Lists

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• Arrays & Hashing
• Two Pointers
• Stack

Problems

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• 1. Two Sum

• 2. Add Two Numbers

• 3. Longest Substring Without Repeating Characters

• 5. Longest Palindromic Substring

• 7. Reverse Integer

• 8. String to Integer (atoi)

• 9. Palindrome Number

• 11. Container With Most Water

• 12. Integer to Roman

• 13. Roman to Integer

• 14. Longest Common Prefix

• 15. 3Sum

• 16. 3Sum Closest

• 18. 4Sum

• 19. Remove Nth Node From End of List

• 20. Valid Parentheses

• 21. Merge Two Sorted Lists

• 22. Generate Parentheses

• 23. Merge k Sorted Lists

• 24. Swap Nodes in Pairs

• 25. Reverse Nodes in k-Group

• 26. Remove Duplicates from Sorted Array

• 27. Remove Element

• 28. Find the Index of the First Occurrence in a String

• 31. Next Permutation

• 33. Search in Rotated Sorted Array

• 34. Find First and Last Position of Element in Sorted Array

• 35. Search Insert Position

• 36. Valid Sudoku

• 42. Trapping Rain Water

• 48. Rotate Image

• 49. Group Anagrams

• 53. Maximum Subarray

• 56. Merge Intervals

• 61. Rotate List

• 66. Plus One

• 69. Sqrt(x)

• 70. Climbing Stairs

• 71. Simplify Path

• 74. Search a 2D Matrix

• 75. Sort Colors

• 76. Minimum Window Substring

• 84. Largest Rectangle in Histogram

• 88. Merge Sorted Array

• 98. Validate Binary Search Tree

• 100. Same Tree

• 101. Symmetric Tree

• 103. Binary Tree Zigzag Level Order Traversal

• 104. Maximum Depth of Binary Tree

• 108. Convert Sorted Array to Binary Search Tree

• 110. Balanced Binary Tree

• 113. Path Sum II

• 121. Best Time to Buy and Sell Stock

• 122. Best Time to Buy and Sell Stock II

• 125. Valid Palindrome

• 128. Longest Consecutive Sequence

• 136. Single Number

• 141. Linked List Cycle

• 150. Evaluate Reverse Polish Notation

• 153. Find Minimum in Rotated Sorted Array

• 154. Find Minimum in Rotated Sorted Array II

• 162. Find Peak Element

• 167. Two Sum II - Input Array Is Sorted

• 169. Majority Element

• 199. Binary Tree Right Side View

• 200. Number of Islands

• 205. Isomorphic Strings

• 206. Reverse Linked List

• 209. Minimum Size Subarray Sum

• 215. Kth Largest Element in an Array

• 217. Contains Duplicate

• 219. Contains Duplicate II

• 222. Count Complete Tree Nodes

• 228. Summary Ranges

• 234. Palindrome Linked List

• 235. Lowest Common Ancestor of a Binary Search Tree

• 238. Product of Array Except Self

• 242. Valid Anagram

• 268. Missing Number

• 278. First Bad Version

• 279. Perfect Squares

• 283. Move Zeroes

• 300. Longest Increasing Subsequence

• 309. Best Time to Buy and Sell Stock with Cooldown

• 347. Top K Frequent Elements

• 349. Intersection of Two Arrays

• 350. Intersection of Two Arrays II

• 367. Valid Perfect Square

• 374. Guess Number Higher or Lower

• 387. First Unique Character in a String

• 392. Is Subsequence

• 395. Longest Substring with At Least K Repeating Characters

• 404. Sum of Left Leaves

• 419. Battleships in a Board

• 424. Longest Repeating Character Replacement

• 438. Find All Anagrams in a String

• 443. String Compression

• 463. Island Perimeter

• 485. Max Consecutive Ones

• 557. Reverse Words in a String III

• 560. Subarray Sum Equals K

• 567. Permutation in String

• 581. Shortest Unsorted Continuous Subarray

• 605. Can Place Flowers

• 649. Dota2 Senate

• 652. Find Duplicate Subtrees

• 657. Robot Return to Origin

• 658. Find K Closest Elements

• 680. Valid Palindrome II

• 692. Top K Frequent Words

• 704. Binary Search

• 714. Best Time to Buy and Sell Stock with Transaction Fee

• 739. Daily Temperatures

• 744. Find Smallest Letter Greater Than Target

• 841. Keys and Rooms

• 844. Backspace String Compare

• 849. Maximize Distance to Closest Person

• 852. Peak Index in a Mountain Array

• 853. Car Fleet

• 896. Monotonic Array

• 941. Valid Mountain Array

• 977. Squares of a Sorted Array

• 986. Interval List Intersections

• 1004. Max Consecutive Ones III

• 1329. Sort the Matrix Diagonally

• 1346. Check If N and Its Double Exist

• 1431. Kids With the Greatest Number of Candies

• 1436. Destination City

• 1466. Reorder Routes to Make All Paths Lead to the City Zero

• 1493. Longest Subarray of 1's After Deleting One Element

• 1572. Matrix Diagonal Sum

• 1605. Find Valid Matrix Given Row and Column Sums

• 1901. Find a Peak Element II

• 1909. Remove One Element to Make the Array Strictly Increasing

• 1920. Build Array from Permutation

• 1929_concatenation_of_array

• 2215. Find the Difference of Two Arrays

• 2255. Count Prefixes of a Given String

• 2348. Number of Zero-Filled Subarrays

• 2511. Maximum Enemy Forts That Can Be Captured

• 2657. Find the Prefix Common Array of Two Arrays

• 2760. Longest Even Odd Subarray With Threshold

• 2906. Construct Product Matrix

• 2951. Find the Peaks