index

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
• 14. Longest Common Prefix
• 15. 3Sum
• 16. 3Sum Closest
• 17. Letter Combinations of a Phone Number
• 18. 4 Sum
• 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. Implement strStr()
• 29. Divide Two Integers
• 30. Substring with Concatenation of All Words
• 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
• 37. Sudoku Solver
• 38. Count and Say
• 39. Combination Sum
• 40. Combination Sum II
• 42. Trapping Rain Water
• 43. Multiply Strings
• 44. Wildcard Matching
• 46. Permutations
• 47. Permutations II
• 49. Group Anagrams
• 50. Pow(x, n)
• 51. N-Queens
• 52. N-Queens II
• 53. Maximum Subarray
• 56. Merge Intervals
• 57. Insert Interval
• 58. Length of Last Word
• 60. Permutation Sequence
• 61. Rotate List
• 62. Unique Paths
• 63. Unique Paths II
• 64. Minimum Path Sum
• 66. Plus One
• 67. Add Binary
• 69. Sqrt(x)
• 70. Climbing Stairs
• 71. Simplify Path
• 74. Search a 2D Matrix
• 75. Sort Colors
• 76. Minimum Window Substring
• 77. Combinations
• 78. Subsets
• 79. Word Search
• 81. Search in Rotated Sorted Array II
• 82. Remove Duplicates from Sorted List II
• 83. Remove Duplicates from Sorted List
• 84. Largest Rectangle in Histogram
• 85. Maximal Rectangle
• 86. Partition List
• 88. Merge Sorted Array
• 89. Gray Code
• 90. Subsets II
• 91. Decode Ways
• 92. Reverse Linked List II
• 93. Restore IP Addresses
• 93. Restore IP Adress
• 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
• 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
• 116. Populating Next Right Pointers in Each Node
• 117. Populating Next Right Pointers in Each Node II
• 118. Pascals Triangle
• 119. Pascals Triangle II
• 120. Triangle
• 121. Best Time to Buy and Sell Stock
• 122. Best Time to Buy and Sell Stock II
• 123. Best Time to Buy and Sell Stock III
• 124. Binary Tree Maximum Path Sum
• 125. Valid Palindrome
• 127. Word Ladder
• 128. Longest Consecutive Sequence
• 129. Sum Root to Leaf Numbers
• 130. Surrounded Regions
• 131. Palindrome Partitioning
• 132. Palindrome Partitioning II
• 133. Clone Graph
• 136 Single Number
• 137 Single Number II
• 138. Copy List with Random Pointer
• 139. Word Break
• 141. Linked List Cycle
• 142. Linked List Cycle II
• 143. Reorder List
• 144. Binary Tree Preorder Traversal
• 145. Binary Tree Postorder Traversal
• 146. LRU Cache
• 147. Insertion Sort List
• 148. Sort List
• 149. Max Points on a Line
• 150. Evaluate Reverse Polish Notation
• 151. Reverse Words in a String
• 152. Maximum Product Subarray
• 153. Find Minimum in Rotated Sorted Array
• 155. Min Stack
• 160. Intersection of Two Linked Lists
• 164. Maximum Gap
• 166. Fraction to Recurring Decimal
• 167. Two Sum II - Input array is sorted
• 168. Excel Sheet Column Title
• 169. Majority Element
• 170. TwoSum III
• 171. Excel Sheet Column Number
• 172. Factorial Trailing Zeroes
• 173. Binary Search Tree Iterator
• 174. Dungeon Game
• 179. Largest Number
• 187. Repeated DNA Sequences
• 190. Reverse Bits
• 191. Number of 1 Bits
• 198. House Robber
• 199. Binary Tree Right Side View
• 200. Number of Islands
• 202. Happy Number
• 203. Remove Linked List Elements
• 204. Count Primes
• 205. Isomorphic Strings
• 206. Reverse Linked List
• 207. Course Schedule
• 209. Minimum Size Subarray Sum
• 210. Course Schedule II
• 213. House Robber II
• 215. Kth Largest Element in an Array
• 216. Combination Sum III
• 221. Maximal Square
• 222. Count Complete Tree Nodes
• 224. Basic Calculator
• 225. Implement Stack using Queues
• 226. Invert Binary Tree
• 227. Basic Calculator II
• 229. Majority Element II
• 230. Kth Smallest Element in a BST
• 231. Power of Two
• 232. Implement Queue using Stacks
• 233. Number of Digit One
• 234. Palindrome Linked List
• 235. Lowest Common Ancestor of a Binary Search Tree
• 236. Lowest Common Ancestor of a Binary Tree
• 237. Delete Node in a Linked List
• 240. Search a 2D Matrix II
• 241. Different Ways to Add Parentheses
• 242. Valid Anagram
• 252. Meeting Rooms
• 253. Meeting Rooms II
• 256. Paint House
• 257. Binary Tree Paths
• 258. Add Digits
• 260. Single Number III
• 261. Graph Valid Tree
• 263. Ugly Number
• 264. Ugly Number II
• 265. Paint House II
• 268. Missing Number
• 270. Closest Binary Search Tree Value
• 276. Paint Fence
• 278. First Bad Version
• 279. Perfect Squares
• 280. Wiggle Sort
• 287. Find the Duplicate Number
• 290. Word Pattern
• 295. Find Median from Data Stream
• 297. Serialize and Deserialize Binary Tree
• 300. Longest Increasing Subsequence
• 303. Range Sum Query - Immutable
• 304. Range Sum Query 2D - Immutable
• 309. Best Time to Buy and Sell Stock with Cooldown
• 310. Minimum Height Trees
• 313. Super Ugly Number
• 322. Coin Change
• 324. Wiggle Sort II
• 326. Power of Three
• 328. Odd Even Linked List
• 331. Verify Preorder Serialization of a Binary Tree
• 332. Reconstruct Itinerary
• 337. House Robber III
• 338. Counting Bits
• 342. Power of Four
• 344. Reverse String
• 345. Reverse Vowels of a String
• 347. Top K Frequent Elements
• 349. Intersection of Two Arrays
• 350. Intersection of Two Arrays II
• 359. Logger Rate Limiter
• 366. Find Leaves of Binary Tree
• 367. Valid Perfect Square
• 370. Range Addition
• 372. Super Pow
• 373. Find K Pairs with Smallest Sums
• 378. Kth Smallest Element in a Sorted Matrix
• 382. Linked List Random Node
• 384. Shuffle an Array
• 387. First Unique Character in a String
• 399. Evaluate Division
• 401. Binary Watch
• 404. Sum of Left Leaves
• 409. Longest Palindrome
• 415. Add Strings
• 426. Convert Binary Search Tree to Sorted Doubly Linked List
• 429. N-ary Tree Level Order Traversal
• 430. Flatten a Multilevel Doubly Linked List
• 437. Path Sum III
• 438. Find All Anagrams in a String
• 445. Add Two Numbers II
• 451. Sort Characters By Frequency
• 463. Island Perimeter
• 493. Reverse Pairs
• 500. Keyboard Row
• 507. Perfect Number
• 518. Coin Change 2
• 538. Convert BST to Greater Tree
• 559. Maximum Depth of N-ary Tree
• 590. N-ary Tree Postorder Traversal
• 599. Minimum Index Sum of Two Lists
• 606. Construct String from Binary Tree
• 633. Sum of Square Numbers
• 637. Average of Levels in Binary Tree
• 671. Second Minimum Node In a Binary Tree
• 684. Redundant Connection
• 685. Redundant Connection II
• 687. Longest Univalue Path
• 692. Top K Frequent Words
• 697. Degree of an Array
• 703. Kth Largest Element in a Stream
• 704. Binary Search
• 716. Max Stack
• 728. Self Dividing Numbers
• 741. Cherry Pickup
• 743. Network Delay Time
• 746. Min Cost Climbing Stairs
• 760. Find Anagram Mappings
• 783. Minimum Distance Between BST Nodes
• 784. Letter Case Permutation
• 785. Is Graph Bipartite?
• 841. Keys and Rooms
• 867. Transpose Matrix
• 873. Length of Longest Fibonacci Subsequence
• 876. Middle of the Linked List
• 941. Valid Mountain Array
• 1020. Number of Enclaves
• 1114. Print in Order
• 1115. Print FooBar Alternately