leetcode

My solutions of problems from LeetCode

Link to GitHub repository

Lists

neetcode.io

• Arrays & Hashing
• Two Pointers
• Stack

Problems

• Concurrency
• Design

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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