Medium(14) String(12) Easy(9) TwoPointers(8) Array(7) HashTable(5) LinkedList(5) Math(5) Recursion(4) Hard(3) DynamicProgramming(3) Sorting(2) Backtracking(2) SlidingWindow(1) BinarySearch(1) DivideAndConqure(1) Greedy(1) Trie(1) Stack(1) DivideAndConquer(1) Heap(1) MergeSort(1) StringMatching(1)

LeetCode

• 1. Two Sum
• 2. Add Two Numbers
• 3. Longest Substring Without Repeating Characters
• 4. Median of Two Sorted Arrays
• 5. Longest Palindromic Substring
• 6. ZigZag Conversion
• 7. Reverse Integer
• 8. String to Integer (atoi)
• 9. Palindrome Number
• 10. Regular Expression Matching
• 11. Container With Most Water
• 12. Integer to Roman
• 13. Roman to Integer
• 14. Longest Common Prefix
• 15. 3Sum
• 16. 3Sum Closest
• 17. Letter Combinations of a Phone Number
• 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
• 26. Remove Duplicates from Sorted Array
• 27. Remove Element
• 28. Implement strStr()
• 31. Next Permutation
• 32. Longest Valid Parentheses
• 33. Search in Rotated Sorted Array
• 34. Find First and Last Position of Element in Sorted Array
• 35. Search Insert Position
• 36. Valid Sudoku
• 38. Count and Say
• 39. Combination Sum
• 40. Combination Sum II
• 41. First Missing Positive
• 43. Multiply Strings
• 45. Jump Game II
• 46. Permutations
• 47. Permutations II
• 48. Rotate Image
• 49. Group Anagrams
• 50. Pow(x, n)
• 53. Maximum Subarray
• 54. Spiral Matrix
• 55. Jump Game
• 56. Merge Intervals
• 57. Insert Interval
• 58. Length of Last Word
• 59. Spiral Matrix II
• 60. Permutation Sequence
• 61. Rotate List
• 62. Unique Paths
• 63. Unique Paths II
• 65. Valid Number
• 66. Plus One
• 67. Add Binary
• 68. Text Justification
• 69. Sqrt(x)
• 70. Climbing Stairs
• 71. Simplify Path
• 73. Set Matrix Zeroes
• 74. Search a 2D Matrix
• 75. Sort Colors
• 77. Combinations
• 78. Subsets
• 79. Word Search
• 80. Remove Duplicates from Sorted Array II
• 81. Search in Rotated Sorted Array II
• 82. Remove Duplicates from Sorted List II
• 83. Remove Duplicates from Sorted List
• 86. Partition List
• 88. Merge Sorted Array
• 92. Reverse Linked List II
• 93. Restore IP Addresses
• 94. Binary Tree Inorder Traversal
• 95. Unique Binary Search Trees II
• 96. Unique Binary Search Trees
• 98. Validate Binary Search Tree
• 99. Recover Binary Search Tree
• 100. Same Tree
• 101. Symmetric Tree
• 102. Binary Tree Level Order Traversal
• 103. Binary Tree Zigzag Level Order Traversal
• 104. Maximum Depth of Binary Tree
• 105. Construct Binary Tree from Preorder and Inorder Traversal
• 106. Construct Binary Tree from Inorder and Postorder Traversal
• 107. Binary Tree Level Order Traversal II
• 108. Convert Sorted Array to Binary Search Tree
• 109. Convert Sorted List to Binary Search Tree
• 110. Balanced Binary Tree
• 111. Minimum Depth of Binary Tree
• 112. Path Sum
• 113. Path Sum II
• 114. Flatten Binary Tree to Linked List
• 115. Distinct Subsequences
• 116. Populating Next Right Pointers in Each Node
• 117. Populating Next Right Pointers in Each Node II
• 118. Pascal's Triangle
• 119. Pascal's Triangle II
• 120. Triangle
• 121. Best Time to Buy and Sell Stock
• 122. Best Time to Buy and Sell Stock II
• 125. Valid Palindrome
• 129. Sum Root to Leaf Numbers
• 136. Single Number
• 141. Linked List Cycle
• 143. Reorder List
• 144. Binary Tree Preorder Traversal
• 145. Binary Tree Postorder Traversal
• 151. Reverse Words in a String
• 153. Find Minimum in Rotated Sorted Array
• 155. Min Stack
• 160. Intersection of Two Linked Lists
• 175. Combine Two Tables
• 176. Second Highest Salary
• 181. Employees Earning More Than Their Managers
• 182. Duplicate Emails
• 183. Customers Who Never Order
• 192. Word Frequency
• 195. Tenth Line
• 196. Delete Duplicate Emails
• 197. Rising Temperature
• 199. Binary Tree Right Side View
• 203. Remove Linked List Elements
• 206. Reverse Linked List
• 217. Contains Duplicate
• 222. Count Complete Tree Nodes
• 223. Rectangle Area
• 226. Invert Binary Tree
• 230. Kth Smallest Element in a BST
• 235. Lowest Common Ancestor of a Binary Search Tree
• 236. Lowest Common Ancestor of a Binary Tree
• 237. Delete Node in a Linked List
• 257. Binary Tree Paths
• 263. Ugly Number
• 278. First Bad Version
• 283. Move Zeroes
• 290. Word Pattern
• 292. Nim Game
• 299. Bulls and Cows
• 303. Range Sum Query - Immutable
• 326. Power of Three
• 328. Odd Even Linked List
• 342. Power of Four
• 344. Reverse String
• 345. Reverse Vowels of a String
• 383. Ransom Note
• 387. First Unique Character in a String
• 404. Sum of Left Leaves
• 434. Number of Segments in a String
• 445. Add Two Numbers II
• 501. Find Mode in Binary Search Tree
• 520. Detect Capital
• 541. Reverse String II
• 645. Set Mismatch
• 690. Employee Importance
• 704. Binary Search
• 705. Design HashSet
• 706. Design HashMap
• 707. Design Linked List
• 709. To Lower Case
• 725. Split Linked List in Parts
• 729. My Calendar I
• 766. Toeplitz Matrix
• 771. Jewels and Stones
• 781. Rabbits in Forest
• 784. Letter Case Permutation
• 796. Rotate String
• 804. Unique Morse Code Words
• 806. Number of Lines To Write String
• 811. Subdomain Visit Count
• 817. Linked List Components
• 825. Friends Of Appropriate Ages
• 830. Positions of Large Groups
• 832. Flipping an Image
• 835. Image Overlap
• 840. Magic Squares In Grid
• 849. Maximize Distance to Closest Person
• 867. Transpose Matrix
• 876. Middle of the Linked List
• 883. Projection Area of 3D Shapes
• 884. Uncommon Words from Two Sentences
• 892. Surface Area of 3D Shapes
• 896. Monotonic Array
• 1019. Next Greater Node In Linked List
• 1171. Remove Zero Sum Consecutive Nodes from Linked List
• 1185. Day of the Week
• 1200. Minimum Absolute Difference
• 1222. Queens That Can Attack the King
• 1232. Check If It Is a Straight Line
• 1290. Convert Binary Number in a Linked List to Integer
• 1367. Linked List in Binary Tree