| Number | Title | Tags | Difficulty |
|---|---|---|---|
| 993 | Number of Recent Calls | Queue | Easy |
| 100 | Same Tree | Tree | Easy |
| 101 | Symmetric Tree | Tree | Easy |
| 104 | Maximum Depth of Binary Tree | Tree | Easy |
| 107 | Binary Tree Level Order Traversal II | Tree | Eazy |
| 108 | Convert Sorted Array to Binary Search Tree | Tree | Easy |
| 110 | Balanced Binary Tree | Tree | Easy |
| 111 | Minimum Depth of Binary Tree | Tree | Easy |
| 112 | Path Sum | Tree | Easy |
| 226 | Invert Binary Tree | Tree | Easy |
| 235 | Lowest Common Ancestor of a Binary Search Tree | Tree | Easy |
| 257 | Binary Tree Paths | Tree | Easy |
| 404 | Sum of Left Leaves | Tree | Easy |
| 437 | Path Sum III | Tree | Easy |
| 501 | Find Mode in Binary Search Tree | Tree | Easy |
| 530 | Minimum Absolute Difference in BST | Tree | Easy |
| 538 | Convert BST to Greater Tree | Tree | Easy |
| 543 | Diameter of Binary Tree | Tree | Easy |
| 563 | Binary Tree Tilt | Tree | Easy |
| 572 | Subtree of Another Tree | Tree | Easy |
| 606 | Construct String from Binary Tree | Tree | Easy |
| 617 | Merge Two Binary Trees | Tree | Easy |
| 637 | Average of Levels in Binary Tree | Tree | Easy |
| 653 | Two Sum IV - Input is a BST | Tree | Easy |
| 669 | Trim a Binary Search Tree | Tree | Easy |
| 671 | Second Minimum Node In a Binary Tree | Tree | Easy |
| 687 | Longest Univalue Path | Tree | Easy |
| 700 | Search in a Binary Search Tree | Tree | Easy |
| 783 | Minimum Distance Between BST Nodes | Tree | Easy |
| 872 | Leaf-Similar Trees | Tree | Easy |
| 897 | Increasing Order Search Tree | Tree | Easy |
| 938 | Range Sum of BST | Tree | Easy |
| 965 | Univalued Binary Tree | Tree | Easy |
| 993 | Cousins in Binary Tree | Tree | Easy |
| 1022 | Sum of Root To Leaf Binary Numbers | Tree | Easy |
| 102 | Binary Tree Level Order Traversal | Tree | Medium |
| 98 | Validate Binary Search Tree | Tree | Medium |
| 1 | Two Sum | Array | Easy |
| 53 | Maximum Subarray | Array | Easy |
| 118 | Pascal's Triangle | Array | Easy |
| 119 | Pascal's Triangle II | Array | Easy |
| 121 | Best Time to Buy and Sell Stock | Array | Easy |
| 122 | Best Time to Buy and Sell Stock II | Array | Easy |
| 169 | Majority Element | Array | Easy |
| 189 | Rotate Array | Array | Easy |
| 217 | Contains Duplicate | Array | Easy |
| 219 | Contains Duplicate II | Array | Easy |
| 448 | Find All Numbers Disappeared in an Array | Array | Easy |
| 485 | Max Consecutive Ones | Array | Easy |
| 509 | Fibonacci Number | Array | Easy |
| 561 | Array Partition I | Array | Easy |
| 566 | Reshape the Matrix | Array | Easy |
| 581 | Shortest Unsorted Continuous Subarray | Array | Easy |
| 628 | Maximum Product of Three Numbers | Array | Easy |
| 643 | Maximum Average Subarray I | Array | Easy |
| 665 | Non-decreasing Array | Array | Easy |
| 674 | Longest Continuous Increasing Subsequence | Array | Easy |
| 697 | Degree of an Array | Array | Easy |
| 717 | 1-bit and 2-bit Characters | Array | Easy |
| 724 | Find Pivot Index | Array | Easy |
| 746 | Min Cost Climbing Stairs | Array | Easy |
| 747 | Largest Number At Least Twice of Others | Array | Easy |
| 766 | Toeplitz Matrix | Array | Easy |
| 830 | Positions of Large Groups | Array | Easy |
| 832 | Flipping an Image | Array | Easy |
| 867 | Transpose Matrix | Array | Easy |
| 888 | Fair Candy Swap | Array | Easy |
| 896 | Monotonic Array | Array | Easy |
| 905 | Sort Array By Parity | Array | Easy |
| 922 | Sort Array By Parity II | Array | Easy |
| 941 | Valid Mountain Array | Array | Easy |
| 977 | Squares of a Sorted Array | Array | Easy |
| 985 | Sum of Even Numbers After Queries | Array | Easy |
| 989 | Add to Array-Form of Integer | Array | Easy |
| 999 | Available Captures for Rook | Array | Easy |
| 1002 | Find Common Characters | Array | Easy |
| 1010 | Pairs of Songs With Total Durations Divisible by 60 | Array | Easy |
| 1013 | Partition Array Into Three Parts With Equal Sum | Array | Easy |
| 1051 | Height Checker | Array | Easy |
| 1089 | Duplicate Zeros | Array | Easy |
| 283 | Move Zeroes | Array | Easy |
| 445 | Assign Cookies | Array | Easy |
| 11 | Container With Most Water | Array | Medium |
| 4 | Median of Two Sorted Arrays | Array | Hard |
| 17 | Letter Combinations of a Phone Number | Array | Medium |
| 22 | Generate Parentheses | Array | Medium |
| 46 | Permutations | Array | Medium |
| 47 | Permutations II | Array | Medium |
| 136 | Single Number | BitManipulation | Easy |
| 190 | Reverse Bits | BitManipulation | Easy |
| 191 | Number of 1 Bits | BitManipulation | Easy |
| 231 | Power of Two | BitManipulation | Easy |
| 342 | Power of Four | BitManipulation | Easy |
| 389 | Find the Difference | BitManipulation | Easy |
| 405 | Convert a Number to Hexadecimal | BitManipulation | Easy |
| 461 | Hamming Distance | BitManipulation | Easy |
| 476 | Number Complement | BitManipulation | Easy |
| 693 | Binary Number with Alternating Bits | BitManipulation | Easy |
| 762 | Prime Number of Set Bits in Binary Representation | BitManipulation | Easy |
| 20 | Valid Parentheses | Stack | Easy |
| 225 | Implement Stack using Queues | Stack | Easy |
| 232 | Implement Queue using Stacks | Stack | Easy |
| 682 | Baseball Game | Stack | Easy |
| 844 | Backspace String Compare | Stack | Easy |
| 205 | Isomorphic Strings | HashTable | Easy |
| 290 | Word Pattern | HashTable | Easy |
| 349 | Intersection of Two Arrays | HashTable | Easy |
| 350 | Intersection of Two Arrays II | HashTable | Easy |
| 409 | Longest Palindrome | HashTable | Easy |
| 438 | Find All Anagrams in a String | HashTable | Medium |
| 447 | Number of Boomerangs | HashTable | Easy |
| 463 | Island Perimeter | HashTable | Easy |
| 500 | Keyboard Row | HashTable | Easy |
| 575 | Distribute Candies | HashTable | Easy |
| 594 | Longest Harmonious Subsequence | HashTable | Easy |
| 599 | Minimum Index Sum of Two Lists | HashTable | Easy |
| 645 | Set Mismatch | HashTable | Easy |
| 705 | Design HashSet | HashTable | Easy |
| 706 | Design HashMap | HashTable | Easy |
| 720 | Longest Word in Dictionary | HashTable | Easy |
| 748 | Shortest Completing Word | HashTable | Easy |
| 771 | Jewels and Stones | HashTable | Easy |
| 811 | Subdomain Visit Count | HashTable | Easy |
| 884 | Uncommon Words from Two Sentences | HashTable | Easy |
| 953 | Verifying an Alien Dictionary | HashTable | Easy |
| 961 | N-Repeated Element in Size 2N Array | HashTable | Easy |
| 1078 | Occurrences After Bigram | HashTable | Easy |
| 1160 | Find Words That Can Be Formed by Characters | HashTable | Easy |
| 92 | Reverse Linked List II | LinkedList | Medium |
| 141 | Linked List Cycle | LinkedList | Easy |
| 141 | Add Two Numbers | LinkedList | Medium |
| 142 | Linked List Cycle II | LinkedList | Medium |
| 69 | Sqrt(x) | Math | Easy |
| 50 | Pow(x, n) | Math | Medium |
| 168 | Excel Sheet Column Title | Math | Easy |
| 171 | Excel Sheet Column Number | Math | Easy |
| 172 | Factorial Trailing Zeroes | Math | Easy |
| 204 | Count Primes | Math | Easy |
| 258 | Add Digits | Math | Easy |
| 263 | Ugly Number | Math | Easy |
| 367 | Valid Perfect Square | Math | Easy |
| 441 | Arranging Coins | Math | Easy |
| 728 | Self Dividing Numbers | Math | Easy |
| 754 | Reach a Number | Math | Medium |
| 868 | Binary Gap | Math | Easy |
| 883 | Projection Area of 3D Shapes | Math | Easy |
| 892 | Surface Area of 3D Shapes | Math | Easy |
| 942 | DI String Match | Math | Easy |
| 976 | Largest Perimeter Triangle | Math | Easy |
| 1009 | Complement of Base 10 Integer | Math | Easy |
| 1103 | Distribute Candies to People | Math | Easy |
| 1154 | Day of the Year | Math | Easy |
| 1175 | Prime Arrangements | Math | Easy |
| 1217 | Play with Chips | Math | Easy |
| 1232 | Check If It Is a Straight Line | Math | Easy |
| 78 | Subsets | Backtracking | Medium |
| 77 | Combinations | Backtracking | Medium |
| 89 | Gray Code | Backtracking | Medium |
| 93 | Restore IP Addresses | Backtracking | Medium |
| 79 | exist | Backtracking | Medium |
| 51 | N-Queens | Backtracking | Hard |
| 39 | Combination Sum | Backtracking | Medium |
| 216 | Combination Sum III | Backtracking | Medium |
| 12 | Integer to Roman | String | Medium |
| 13 | Roman to Integer | String | Easy |
| 28 | Implement strStr() | String | Easy |
| 38 | Count and Say | String | Easy |
| 58 | Length of Last Word | String | Easy |
| 67 | Add Binary | String | Easy |
| 125 | Valid Palindrome | String | Easy |
| 345 | Reverse Vowels of a String | String | Easy |
| 383 | Ransom Note | String | Easy |
| 387 | First Unique Character in a String | String | Easy |
| 434 | Number of Segments in a String | String | Easy |
| 443 | String Compression | String | Easy |
| 459 | Repeated Substring Pattern | String | Easy |
| 520 | Detect Capital | String | Easy |
| 521 | Longest Uncommon Subsequence I | String | Easy |
| 541 | Reverse String II | String | Easy |
| 551 | Student Attendance Record I | String | Easy |
| 557 | Reverse Words in a String III | String | Easy |
| 657 | Robot Return to Origin | String | Easy |
| 686 | Repeated String Match | String | Easy |
| 709 | To Lower Case | String | Easy |
| 788 | Rotated Digits | String | Easy |
| 804 | Unique Morse Code Words | String | Easy |
| 819 | Most Common Word | String | Easy |
| 824 | Goat Latin | String | Easy |
| 917 | Reverse Only Letters | String | Easy |
| 929 | Unique Email Addresses | String | Easy |
| 3 | Longest Substring Without Repeating Characters | String | Medium |
| 5 | Longest Palindromic Substring | String | Medium |
| 62 | Unique Paths | DP | Medium |
| 64 | Minimum Path Sum | DP | Medium |
| 70 | Climbing Stairs | DP | Easy |
| 198 | House Robber | DP | Easy |
| 213 | House Robber II | DP | Medium |
| 300 | Longest Increasing Subsequence | DP | Medium |
| 303 | Range Sum Query - Immutable | DP | Easy |
| 392 | Is Subsequence | DP | Easy |
| 413 | Arithmetic Slices | DP | Medium |
| 516 | Longest Palindromic Subsequence | DP | Medium |
| 208 | Implement Trie (Prefix Tree) | Trie | Medium |
| 212 | Word Search II | Trie | Medium |
go test -v -bench=./bit_test.go -test.run TestSingleNumber