| # | Title | Solution |
|---|---|---|
| 1 | Two Sum | Solution |
| 2 | Add Two Numbers | Solution |
| 3 | Longest Substring Without Repeating Characters | Solution |
| 5 | Longest Palindromic Substring | Solution |
| 6 | ZigZag Conversion | Solution |
| 7 | Reverse Integer | Solution |
| 8 | String to Integer (atoi) | Solution |
| 9 | Palindrome Number | Solution |
| 11 | Container With Most Water | Solution |
| 13 | Roman to Integer | Solution |
| 14 | Longest Common Prefix | Solution |
| 15 | 3Sum | Solution |
| 17 | Letter Combinations of a Phone Number | Solution |
| 19 | Remove Nth Node From End of List | Solution |
| 20 | Valid Parentheses | Solution |
| 21 | Merge Two Sorted Lists | Solution |
| 22 | Generate Parentheses | Solution |
| 23 | Merge k Sorted Lists | Solution |
| 25 | Reverse Nodes in k-Group | Solution |
| 26 | Remove Duplicates from Sorted Array | Solution |
| 27 | Remove Element | Solution |
| 28 | Implement strStr() | Solution |
| 29 | Divide Two Integers | Solution |
| 32 | Longest Valid Parentheses | Solution |
| 33 | Search in Rotated Sorted Array | Solution |
| 34 | Find First and Last Position of Element in Sorted Array | Solution |
| 37 | Sudoku Solver | Solution |
| 39 | Combination Sum | Solution |
| 40 | Combination Sum II | Solution |
| 41 | First Missing Positive | Solution |
| 42 | Trapping Rain Water | Solution |
| 43 | Multiply Strings | Solution |
| 45 | Jump Game II | Solution |
| 46 | Permutations | Solution |
| 47 | Permutations II | Solution |
| 48 | Rotate Image | Solution |
| 49 | Group Anagrams | Solution |
| 50 | Pow(x, n) | Solution |
| 51 | N-Queens | Solution |
| 53 | Maximum Subarray | Solution |
| 53 | Maximum Subarray | Solution |
| 54 | Spiral Matrix | Solution |
| 55 | Jump Game | Solution |
| 56 | Merge Intervals | Solution |
| 57 | Insert Interval | Solution |
| 58 | Length of Last Word | Solution |
| 59 | Spiral Matrix II | Solution |
| 61 | Rotate List | Solution |
| 62 | Unique Paths | Solution |
| 63 | Unique Paths II | Solution |
| 64 | Minimum Path Sum | Solution |
| 66 | Plus One | Solution |
| 67 | Add Binary | Solution |
| 71 | Simplify Path | Solution |
| 73 | Set Matrix Zeroes | Solution |
| 74 | Search a 2D Matrix | Solution |
| 75 | Sort Colors | Solution |
| 76 | Minimum Window Substring | Solution |
| 77 | Combinations | Solution |
| 78 | Subsets | Solution |
| 80 | Remove Duplicates from Sorted Array II | Solution |
| 81 | Search in Rotated Sorted Array II | Solution |
| 82 | Remove Duplicates from Sorted List II | Solution |
| 83 | Remove Duplicates from Sorted List | Solution |
| 84 | Largest Rectangle in Histogram | Solution |
| 85 | Maximal Rectangle | Solution |
| 86 | Partition List | Solution |
| 88 | Merge Sorted Array | Solution |
| 90 | Subsets II | Solution |
| 92 | Reverse Linked List II | Solution |
| 93 | Restore IP Addresses | Solution |
| 94 | Binary Tree Inorder Traversal | Solution |
| 95 | Unique Binary Search Trees II | Solution |
| 96 | Unique Binary Search Trees | Solution |
| 98 | Validate Binary Search Tree | Solution |
| 100 | Same Tree | Solution |
| 101 | Symmetric Tree | Solution |
| 102 | Binary Tree Level Order Traversal | Solution |
| 103 | Binary Tree Zigzag Level Order Traversal | Solution |
| 104 | Maximum Depth of Binary Tree | Solution |
| 105 | Construct Binary Tree from Preorder and Inorder Traversal | Solution |
| 106 | Construct Binary Tree from Inorder and Postorder Traversal | Solution |
| 107 | Binary Tree Level Order Traversal II | Solution |
| 108 | Convert Sorted Array to Binary Search Tree | Solution |
| 110 | Balanced Binary Tree | Solution |
| 111 | Minimum Depth of Binary Tree | Solution |
| 112 | Path Sum | Solution |
| 113 | Path Sum II | Solution |
| 114 | Flatten Binary Tree to Linked List | Solution |
| 118 | Pascal's Triangle | Solution |
| 119 | Pascal's Triangle II | Solution |
| 121 | Best Time to Buy and Sell Stock | Solution |
| 122 | Best Time to Buy and Sell Stock II | Solution |
| 123 | Best Time to Buy and Sell Stock III | Solution |
| 124 | Binary Tree Maximum Path Sum | Solution |
| 125 | Valid Palindrome | Solution |
| 128 | Longest Consecutive Sequence | Solution |
| 131 | Palindrome Partitioning | Solution |
| 134 | Gas Station | Solution |
| 135 | Candy | Solution |
| 139 | Word Break | Solution |
| 141 | Linked List Cycle | Solution |
| 142 | Linked List Cycle II | Solution |
| 144 | Binary Tree Preorder Traversal | Solution |
| 145 | Binary Tree Postorder Traversal | Solution |
| 146 | LRU Cache | Solution |
| 148 | Sort List | Solution |
| 150 | Evaluate Reverse Polish Notation | Solution |
| 151 | Reverse Words in a String | Solution |
| 152 | Maximum Product Subarray | Solution |
| 153 | Find Minimum in Rotated Sorted Array | Solution |
| 154 | Find Minimum in Rotated Sorted Array II | Solution |
| 160 | Intersection of Two Linked Lists | Solution |
| 162 | Find Peak Element | Solution |
| 167 | Two Sum II - Input Array Is Sorted | Solution |
| 168 | Excel Sheet Column Title | Solution |
| 171 | Excel Sheet Column Number | Solution |
| 172 | Factorial Trailing Zeroes | Solution |
| 173 | Binary Search Tree Iterator | Solution |
| 179 | Largest Number | Solution |
| 187 | Repeated DNA Sequences | Solution |
| 188 | Best Time to Buy and Sell Stock IV | Solution |
| 189 | Rotate Array | Solution |
| 190 | Reverse Bits | Solution |
| 191 | Number of 1 Bits | Solution |
| 199 | Binary Tree Right Side View | Solution |
| 200 | Number of Islands | Solution |
| 202 | Happy Number | Solution |
| 203 | Remove Linked List Elements | Solution |
| 205 | Isomorphic Strings | Solution |
| 206 | Reverse Linked List | Solution |
| 207 | Course Schedule | Solution |
| 208 | Implement Trie (Prefix Tree) | Solution |
| 209 | Minimum Size Subarray Sum | Solution |
| 211 | Design Add and Search Words Data Structure | Solution |
| 214 | Shortest Palindrome | Solution |
| 215 | Kth Largest Element in an Array | Solution |
| 216 | Combination Sum III | Solution |
| 217 | Contains Duplicate | Solution |
| 219 | Contains Duplicate II | Solution |
| 220 | Contains Duplicate III | Solution |
| 221 | Maximal Square | Solution |
| 222 | Count Complete Tree Nodes | Solution |
| 224 | Basic Calculator | Solution |
| 225 | Implement Stack using Queues | Solution |
| 227 | Basic Calculator II | Solution |
| 230 | Kth Smallest Element in a BST | Solution |
| 231 | Power of Two | Solution |
| 232 | Implement Queue using Stacks | Solution |
| 234 | Palindrome Linked List | Solution |
| 235 | Lowest Common Ancestor of a Binary Search Tree | Solution |
| 236 | Lowest Common Ancestor of a Binary Tree | Solution |
| 238 | Product of Array Except Self | Solution |
| 239 | Sliding Window Maximum | Solution |
| 242 | Valid Anagram | Solution |
| 252 | Meeting Rooms | Solution |
| 253 | Meeting Rooms II | Solution |
| 254 | Factor Combinations | Solution |
| 257 | Binary Tree Paths | Solution |
| 258 | Add Digits | Solution |
| 263 | Ugly Number | Solution |
| 274 | H-Index | Solution |
| 278 | First Bad Version | Solution |
| 283 | Move Zeroes | Solution |
| 285 | Inorder Successor in BST | Solution |
| 287 | Find the Duplicate Number | Solution |
| 289 | Game of Life | Solution |
| 290 | Word Pattern | Solution |
| 295 | Find Median from Data Stream | Solution |
| 297 | Serialize and Deserialize Binary Tree | Solution |
| 299 | Bulls and Cows | Solution |
| 300 | Longest Increasing Subsequence | Solution |
| 303 | Range Sum Query - Immutable | Solution |
| 304 | Range Sum Query 2D - Immutable | Solution |
| 319 | Bulb Switcher | Solution |
| 324 | Wiggle Sort II | Solution |
| 326 | Power of Three | Solution |
| 328 | Odd Even Linked List | Solution |
| 331 | Verify Preorder Serialization of a Binary Tree | Solution |
| 334 | Increasing Triplet Subsequence | Solution |
| 341 | Flatten Nested List Iterator | Solution |
| 342 | Power of Four | Solution |
| 344 | Reverse String | Solution |
| 345 | Reverse Vowels of a String | Solution |
| 347 | Top K Frequent Elements | Solution |
| 349 | Intersection of Two Arrays | Solution |
| 350 | Intersection of Two Arrays II | Solution |
| 376 | Wiggle Subsequence | Solution |
| 380 | Insert Delete GetRandom O(1) | Solution |
| 383 | Ransom Note | Solution |
| 385 | Mini Parser | Solution |
| 387 | First Unique Character in a String | Solution |
| 388 | Longest Absolute File Path | Solution |
| 389 | Find the Difference | Solution |
| 392 | Is Subsequence | Solution |
| 394 | Decode String | Solution |
| 395 | Longest Substring with At Least K Repeating Characters | Solution |
| 396 | Rotate Function | Solution |
| 405 | Convert a Number to Hexadecimal | Solution |
| 406 | Queue Reconstruction by Height | Solution |
| 412 | Fizz Buzz | Solution |
| 414 | Third Maximum Number | Solution |
| 415 | Add Strings | Solution |
| 419 | Battleships in a Board | Solution |
| 424 | Longest Repeating Character Replacement | Solution |
| 429 | N-ary Tree Level Order Traversal | Solution |
| 434 | Number of Segments in a String | Solution |
| 438 | Find All Anagrams in a String | Solution |
| 442 | Find All Duplicates in an Array | Solution |
| 445 | Add Two Numbers II | Solution |
| 448 | Find All Numbers Disappeared in an Array | Solution |
| 449 | Serialize and Deserialize BST | Solution |
| 451 | Sort Characters By Frequency | Solution |
| 452 | Minimum Number of Arrows to Burst Balloons | Solution |
| 454 | 4Sum II | Solution |
| 455 | Assign Cookies | Solution |
| 459 | Repeated Substring Pattern | Solution |
| 460 | LFU Cache | Solution |
| 461 | Hamming Distance | Solution |
| 467 | Unique Substrings in Wraparound String | Solution |
| 475 | Heaters | Solution |
| 476 | Number Complement | Solution |
| 477 | Total Hamming Distance | Solution |
| 480 | Sliding Window Median | Solution |
| 482 | License Key Formatting | Solution |
| 485 | Max Consecutive Ones | Solution |
| 491 | Increasing Subsequences | Solution |
| 495 | Teemo Attacking | Solution |
| 496 | Next Greater Element I | Solution |
| 498 | Diagonal Traverse | Solution |
| 500 | Keyboard Row | Solution |
| 503 | Next Greater Element II | Solution |
| 504 | Base 7 | Solution |
| 506 | Relative Ranks | Solution |
| 507 | Perfect Number | Solution |
| 508 | Most Frequent Subtree Sum | Solution |
| 513 | Find Bottom Left Tree Value | Solution |
| 515 | Find Largest Value in Each Tree Row | Solution |
| 520 | Detect Capital | Solution |
| 523 | Continuous Subarray Sum | Solution |
| 524 | Longest Word in Dictionary through Deleting | Solution |
| 525 | Contiguous Array | Solution |
| 528 | Random Pick with Weight | Solution |
| 530 | Minimum Absolute Difference in BST | Solution |
| 532 | K-diff Pairs in an Array | Solution |
| 537 | Complex Number Multiplication | Solution |
| 538 | Convert BST to Greater Tree | Solution |
| 539 | Minimum Time Difference | Solution |
| 541 | Reverse String II | Solution |
| 543 | Diameter of Binary Tree | Solution |
| 551 | Student Attendance Record I | Solution |
| 554 | Brick Wall | Solution |
| 557 | Reverse Words in a String III | Solution |
| 559 | Maximum Depth of N-ary Tree | Solution |
| 560 | Subarray Sum Equals K | Solution |
| 563 | Binary Tree Tilt | Solution |
| 566 | Reshape the Matrix | Solution |
| 567 | Permutation in String | Solution |
| 572 | Subtree of Another Tree | Solution |
| 575 | Distribute Candies | Solution |
| 581 | Shortest Unsorted Continuous Subarray | Solution |
| 589 | N-ary Tree Preorder Traversal | Solution |
| 590 | N-ary Tree Postorder Traversal | Solution |
| 592 | Fraction Addition and Subtraction | Solution |
| 594 | Longest Harmonious Subsequence | Solution |
| 598 | Range Addition II | Solution |
| 599 | Minimum Index Sum of Two Lists | Solution |
| 605 | Can Place Flowers | Solution |
| 606 | Construct String from Binary Tree | Solution |
| 609 | Find Duplicate File in System | Solution |
| 611 | Valid Triangle Number | Solution |
| 617 | Merge Two Binary Trees | Solution |
| 621 | Task Scheduler | Solution |
| 628 | Maximum Product of Three Numbers | Solution |
| 633 | Sum of Square Numbers | Solution |
| 637 | Average of Levels in Binary Tree | Solution |
| 643 | Maximum Average Subarray I | Solution |
| 645 | Set Mismatch | Solution |
| 646 | Maximum Length of Pair Chain | Solution |
| 647 | Palindromic Substrings | Solution |
| 652 | Find Duplicate Subtrees | Solution |
| 654 | Maximum Binary Tree | Solution |
| 657 | Robot Return to Origin | Solution |
| 658 | Find K Closest Elements | Solution |
| 662 | Maximum Width of Binary Tree | Solution |
| 665 | Non-decreasing Array | Solution |
| 669 | Trim a Binary Search Tree | Solution |
| 670 | Maximum Swap | Solution |
| 671 | Second Minimum Node In a Binary Tree | Solution |
| 674 | Longest Continuous Increasing Subsequence | Solution |
| 678 | Valid Parenthesis String | Solution |
| 680 | Valid Palindrome II | Solution |
| 682 | Baseball Game | Solution |
| 686 | Repeated String Match | Solution |
| 687 | Longest Univalue Path | Solution |
| 692 | Top K Frequent Words | Solution |
| 693 | Binary Number with Alternating Bits | Solution |
| 696 | Count Binary Substrings | Solution |
| 697 | Degree of an Array | Solution |
| 700 | Search in a Binary Search Tree | Solution |
| 702 | Search in a Sorted Array of Unknown Size | Solution |
| 703 | Kth Largest Element in a Stream | Solution |
| 704 | Binary Search | Solution |
| 706 | Design HashMap | Solution |
| 713 | Subarray Product Less Than K | Solution |
| 739 | Daily Temperatures | Solution |
| 767 | Reorganize String | Solution |
| 796 | Rotate String | Solution |
| 845 | Longest Mountain in Array | Solution |
| 875 | Koko Eating Bananas | Solution |
| 876 | Middle of the Linked List | Solution |
| 889 | Construct Binary Tree from Preorder and Postorder Traversal | Solution |
| 912 | Sort an Array | Solution |
| 953 | Verifying an Alien Dictionary | Solution |
| 973 | K Closest Points to Origin | Solution |
| 986 | Interval List Intersections | Solution |
| 1019 | Next Greater Node In Linked List | Solution |
| 1021 | Remove Outermost Parentheses | Solution |
| 1032 | Stream of Characters | Solution |
| 1047 | Remove All Adjacent Duplicates In String | Solution |
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A collection of efficient C/C++ solutions for LeetCode problems.
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