| 771 | Jewels and Stones | java/py/js | Easy |
| 657 | Judge Route Circle | java/py/js | Easy |
| 461 | Hamming Distance | java/py/js | Easy |
| 476 | Number Complement | java/py/js | Easy |
| 728 | Self Dividing Numbers | java/py/js | Easy |
| 804 | Unique Morse Code Words | java/py/js | Easy |
| 500 | Keyboard Row | java/py/js | Easy |
| 344 | Reverse String | java/py/js | Easy |
| 541 | Reverse String II | java/py/js | Easy |
| 292 | Nim Game | java/py/js | Easy |
| 557 | Reverse Words In A String III | java/py/js | Easy |
| 104 | Maximum Depth Of Binary Tree | java/py/js | Easy |
| 617 | Merge Two Binary Trees | java/py/js | Easy |
| 226 | Invert Binary Tree | java/py/js | Easy |
| 693 | Binary Number With Alternating Bits | java/py/js | Easy |
| 108 | Convert Sorted Array To Binary Search Tree | java/py/js | Easy |
| 109 | Convert Sorted List To Binary Search Tree | java/py/js | Medium |
| 561 | Array Partition I | java/py/js | Easy |
| 463 | Island Perimeter | java/py/js | Easy |
| 821 | Shortest Distance To A Character | java/py/js | Easy |
| 371 | Sum Of Two Integers | java/py/js | Easy |
| 171 | Excel Sheet Column Number | java/py/js | Easy |
| 168 | Excel Sheet Column Title | java/py/js | Easy |
| 12 | Integer To Roman | java/py/js | Easy |
| 13 | Roman To Integer | java/py/js | Easy |
| 155 | Min Stack | java/py/js | Easy |
| 232 | Implement Queue Using Stacks | java/py/js | Easy |
| 225 | Implement Stack Using Queues | java/py/js | Easy |
| 20 | Valid Parentheses | java/py/js | Easy |
| 485 | Max Consecutive Ones | java/py/js | Easy |
| 191 | Number Of 1 Bits | java/py/js | Easy |
| 258 | Add Digits | java/py/js | Easy |
| 520 | Detect Capital | java/py/js | Easy |
| 682 | BaseBall Game | java/py/js | Easy |
| 404 | Sum Of Left Leaves | java/py/js | Easy |
| 283 | Move Zeroes | java/py/js | Easy |
| 136 | Single Number | java/py/js | Easy |
| 137 | Single Number II | java/py/js | Medium |
| 260 | Single Number III | java/py/js | Medium |
| 1 | Two Sum | java/py/js | Easy |
| 167 | Two Sum II Input Array Is Sorted | java/py/js | Easy |
| 653 | Two Sum IV Input Is A Bst | java/py/js | Easy |
| 9 | Palindrome Number | java/py/js | Easy |
| 389 | Find The Difference | java/py/js | Easy |
| 94 | Binary Tree Inorder Traversal | java/py/js | Medium |
| 144 | Binary Tree Preorder Traversal | java/py/js | Medium |
| 145 | Binary Tree Postorder Traversal | java/py/js | Hard |
| 231 | Power Of Two | java/py/js | Easy |
| 326 | Power Of Three | java/py/js | Easy |
| 342 | Power Of Four | java/py/js | Easy |
| 38 | Count And Say | java/py/js | Easy |
| 383 | Ransom Note | java/py/js | Easy |
| 217 | Contains Duplicate | java/py/js | Easy |
| 219 | Contains Duplicate II | java/py/js | Easy |
| 27 | Remove Element | java/py/js | Easy |
| 100 | Same Tree | java/py/js | Easy |
| 832 | Flipping An Image | java/py/js | Easy |
| 345 | Reverse Vowels Of A String | java/py/js | Easy |
| 83 | Remove Duplicates From Sorted List | java/py/js | Easy |
| 82 | Remove Duplicates From Sorted List II | java/py/js | Medium |
| 811 | Subdomain Visit Count | java/py/js | Easy |
| 637 | Average Of Levels In Binary Tree | java/py/js | Easy |
| 118 | Pascals Triangle | java/py/js | Easy |
| 303 | Range Sum Query Immutable | java/py/js | Easy |
| 412 | Fizz Buzz | java/py/js | Easy |
| 257 | Binary Tree Paths | java/py/js | Easy |
| 496 | Next Greater Element I | java/py/js | Easy |
| 766 | Toeplitz Matrix | java/py/js | Easy |
| 669 | Trim A Binary Search Tree | java/py/js | Easy |
| 806 | Number Of Lines To Write String | java/py/js | Easy |
| 566 | Reshape The Matrix | java/py/js | Easy |
| 575 | Distribute Candies | java/py/js | Easy |
| 21 | Merge Two Sorted Lists | java/py/js | Easy |
| 88 | Merge Sorted Array | java/py/js | Easy |
| 530 | Minimum Absolute Difference In Bst | java/py/js | Easy |
| 119 | Pascals Triangle II | java/py/js | Easy |
| 690 | Employee Importance | java/py | Easy |
| 169 | Majority Element | java/py/js | Easy |
| 107 | Binary Tree Level Order Traversal II | java/py/js | Easy |
| 349 | Intersection Of Two Arrays | java/py/js | Easy |
| 350 | Intersection Of Two Arrays II | java/py/js | Easy |
| 268 | Missing Number | java/py/js | Easy |
| 788 | Rotated Digits | java/py/js | Easy |
| 695 | Max Area Of Island | java/py/js | Easy |
| 762 | Prime Number Of Set Bits In Binary Representation | java/py/js | Easy |
| 521 | Longest Uncommon Subsequence I | java/py/js | Easy |
| 812 | Largest Triangle Area | java/py/js | Easy |
| 606 | Construct String From Binary Tree | java/py/js | Easy |
| 202 | Happy Number | java/py/js | Easy |
| 563 | Binary Tree Tilt | java/py/js | Easy |
| 696 | Count Binary Substrings | java/py/js | Easy |
| 121 | Best Time To Buy And Sell Stock | java/py/js | Easy |
| 122 | Best Time To Buy And Sell Stock II | java/py/js | Easy |
| 714 | Best Time To Buy And Sell Stock With Transaction Fee | java/py/js | Medium |
| 599 | Minimum Index Sum Of Two Lists | java/py/js | Easy |
| 551 | Student Attendance Record I | java/py/js | Easy |
| 538 | Convert Bst To Greater Tree | java/py/js | Easy |
| 235 | Lowest Common Ancestor Of A Binary Search Tree | java/py/js | Easy |
| 697 | Degree Of An Array | java/py/js | Easy |
| 671 | Second Minimum Node In A Binary Tree | java/py/js | Easy |
| 242 | Valid Anagram | java/py/js | Easy |
| 784 | Letter Case Permutation | java/py/js | Easy |
| 453 | Minimum Moves To Equal Array Elements | java/py/js | Easy |
| 661 | Image Smoother | java/py/js | Easy |
| 598 | Range Addition II | java/py/js | Easy |
| 492 | Construct The Rectangle | java/py/js | Easy |
| 447 | Number Of Boomerangs | java/py/js | Easy |
| 824 | Goat Latin | java/py/js | Easy |
| 206 | Reverse Linked List | java/py/js | Easy |
| 92 | Reverse Linked List II | java/py/js | Medium |
| 733 | Flood Fill | java/py/js | Easy |
| 110 | Balanced Binary Tree | java/py/js | Easy |
| 70 | Climbing Stairs | java/py/js | Easy |
| 448 | Find All Numbers Disappeared In An Array | java/py/js | Easy |
| 409 | Longest Palindrome | java/py/js | Easy |
| 35 | Search Insert Position | java/py/js | Easy |
| 278 | First Bad Version | java/py/js | Easy |
| 101 | Symmetric Tree | java/py/js | Easy |
| 506 | Relative Ranks | java/py/js | Easy |
| 717 | 1 Bit and 2 Bit Characters | java/py/js | Easy |
| 744 | Find Smallest Letter Greater Than Target | java/py/js | Easy |
| 203 | Remove Linked List Elements | java/py/js | Easy |
| 237 | Delete Node In A Linked List | java/py/js | Easy |
| 405 | Convert A Number To Hexadecimal | java/py/js | Easy |
| 796 | Rotate String | java/py/js | Easy |
| 844 | Backspace String Compare | java/py/js | Easy |
| 26 | Remove Duplicates From Sorted Array | java/py/js | Easy |
| 80 | Remove Duplicates From Sorted Array II | java/py/js | Medium |
| 112 | Path Sum | java/py/js | Easy |
| 113 | Path Sum II | java/py/js | Medium |
| 437 | Path Sum III | java/py/js | Easy |
| 263 | Ugly Number | java/py/js | Easy |
| 783 | Minimum Distance Between Bst Nodes | java/py/js | Easy |
| 747 | Largest Number At Least Twice Of Others | java/py/js | Easy |
| 455 | assign cookies | java/py/js | Easy |
| 415 | Add Strings | java/py/js | Easy |
| 66 | Plus One | java/py/js | Easy |
| 67 | Add Binary | java/py/js | Easy |
| 504 | Base 7 | java/py/js | Easy |
| 830 | Positions Of Large Groups | java/py/js | Easy |
| 572 | Subtree Of Another Tree | java/py/js | Easy |
| 819 | Most Common Word | java/py/js | Easy |
| 172 | Factorial Trailing Zeroes | java/py/js | Easy |
| 290 | Word Pattern | java/py/js | Easy |
| 205 | Isomorphic Strings | java/py/js | Easy |
| 125 | Valid Palindrome | java/py/js | Easy |
| 680 | Valid Palindrome II | java/py/js | Easy |
| 141 | Linked List Cycle | java/py/js | Easy |
| 142 | Linked List Cycle II | java/py/js | Medium |
| 387 | First Unique Character In A String | java/py/js | Easy |
| 628 | Maximum Product Of Three Numbers | java/py/js | Easy |
| 724 | Find Pivot Index | java/py/js | Easy |
| 53 | Maximum Subarray | java/py/js | Easy |
| 543 | Diameter Of Binary | java/py/js | Easy |
| 746 | Min Cost Climbing Stairs | java/py/js | Easy |
| 198 | House Robber | java/py/js | Easy |
| 213 | House Robber II | java/py/js | Medium |
| 111 | Minimum Depth Of Binary Tree | java/py/js | Easy |
| 849 | Maximize Distance To Closest Person | java/py/js | Easy |
| 674 | Longest Continuous Increasing Subsequence | java/py/js | Easy |
| 234 | Palindrome Linked List | java/py/js | Easy |
| 414 | Third Maximum Number | java/py/js | Easy |
| 645 | Set Mismatch | java/py/js | Easy |
| 58 | Length Of Last Word | java/py/js | Easy |
| 14 | Longest Common Prefix | java/py/js | Easy |
| 594 | Longest Harmonious Subsequence | java/py/js | Easy |
| 374 | Guess Number Higher Or Lower | java/py | Easy |
| 852 | Peak Index In A Mountain Array | java/py/js | Easy |
| 441 | Arranging Coins | java/py/js | Easy |
| 69 | Sqrtx | java/py/js | Easy |
| 367 | Valid Perfect Square | java/py/js | Easy |
| 475 | Heaters | java/py/js | Easy |
| 501 | Find Mode In Binary Search Tree | java/py/js | Easy |
| 434 | Number Of Segments In A String | java/py/js | Easy |
| 190 | Reverse Bits | java/py/js | Easy |
| 400 | Nth Digits | java/py/js | Easy |
| 160 | Intersection Of Two Linked Lists | java/py/js | Easy |
| 860 | LemonadeChange | java/py/js | Easy |
| 401 | Binary Watch | java/py/js | Easy |
| 482 | License Key Formatting | java/py/js | Easy |
| 720 | Longest Word In Dictionary | java/py/js | Easy |
| 836 | Rectangle Overlap | java/py/js | Easy |
| 643 | Maximum Average Subarray I | java/py/js | Easy |
| 189 | Rotate Array | java/py/js | Easy |
| 61 | Rotate List | java/py/js | Medium |
| 687 | Longest Univalue Path | java/py/js | Easy |
| 28 | Implement Strstr | java/py/js | Easy |
| 459 | Repeated Substring Pattern | java/py/js | Easy |
| 581 | Shortest Unsorted Continuous Subarray | java/py/js | Easy |
| 443 | String Compression | java/py/js | Easy |
| 438 | Find All Anagrams In A String | java/py/js | Easy |
| 7 | Reverse Integer | java/py/js | Easy |
| 507 | Perfect Number | java/py/js | Easy |
| 840 | Magic Squares In Grid | java/py/js | Easy |
| 532 | K Diff Pairs In An Array | java/py/js | Easy |
| 633 | Sum Of Square Numbers | java/py/js | Easy |
| 605 | Can Place Flowers | java/py/js | Easy |
| 204 | Count Primes | java/py/js | Easy |
| 859 | Buddy Strings | java/py/js | Easy |
| 686 | Repeated String Match | java/py/js | Easy |
| 665 | Non Decreasing Array | java/py/js | Easy |
| 867 | Transpose Matrix | java/py/js | Easy |
| 479 | Largest Palindrome Product | java/py/js | Easy |
| 102 | Binray Tree Level Order Traversal | java/py/js | Medium |
| 22 | Generate Parentheses | java/py/js | Medium |
| 704 | Binary Search | java/py/js | Easy |
| 709 | To Lower Case | java/py/js | Easy |
| 700 | Search In A Binary Search Tree | java/py/js | Easy |
| 868 | Binary Gap | java/py/js | Easy |
| 559 | Maximum Depth Of N Ary Tree | java/py | Easy |
| 429 | N Ary Tree Level Order Traversal | java/py | Easy |
| 589 | N Ary Tree Preorder Traversal | java/py | Easy |
| 590 | N Ary Tree Postorder Traversal | java/py | Easy |
| 707 | Design Linked List | java/py/js | Easy |
| 622 | Design Circular Queue | java/py/js | Easy |
| 641 | Design Circular Deque | java/py/js | Easy |
| 705 | Design Hashset | java/py/js | Easy |
| 706 | Design Hashmap | java/py/js | Easy |
| 872 | Leaf Similar Trees | java/py/js | Easy |
| 427 | Construct Quad Tree | java/py | Easy |
| 458 | Poor Pigs | java/py/js | Easy |
| 558 | Quad Tree Intersection | java/py | Easy |
| 874 | Walking Robot Simulation | java/py/js | Easy |
| 876 | Middle Of The Linked List | java/py/js | Easy |
| 703 | Kth Largest Element In A Stream | java/py/js | Easy |
| 39 | Combination Sum | java/py/js | Medium |
| 40 | Combination Sum II | java/py/js | Medium |
| 216 | Combination Sum III | java/py/js | Medium |
| 46 | Permutations | java/py/js | Medium |
| 47 | Permutations II | java/py/js | Medium |
| 77 | Combinations | java/py/js | Medium |
| 78 | Subsets | java/py/js | Medium |
| 90 | Subsets II | java/py/js | Medium |
| 89 | Gray Code | java/py/js | Medium |
| 17 | Letter Combinations Of A Phone Number | java/py/js | Medium |
| 131 | Palindrome Partitioning | java/py/js | Medium |
| 60 | Permutation Sequence | java/py/js | Medium |
| 106 | Construct Binary Tree From Inorder And Postorder Traversal | java/py/js | Medium |
| 105 | Construct Binary Tree From Preorder And Inorder Traversal | java/py/js | Medium |
| 654 | Maximum Binary Tree | java/py/js | Medium |
| 208 | Implement Trie Prefix Tree | java/py/js | Medium |
| 114 | Flatten Binary Tree To Linked List | java/py/js | Medium |
| 284 | Peeking Iterator | java/py | Medium |
| 328 | Odd Even Linked List | java/py/js | Medium |
| 677 | Map Sum Pairs | java/py/js | Medium |
| 442 | Find All Duplicates In An Array | java/py/js | Medium |
| 64 | Minimum Path Sum | java/py/js | Medium |
| 535 | Encode And Decode Tinyurl | java/py/js | Medium |
| 540 | Single Element In A Sorted Array | java/py/js | Medium |
| 148 | Sort List | java/py/js | Medium |
| 24 | Swap Nodes In Pairs | java/py/js | Medium |
| 143 | Reorder List | java/py/js | Medium |
| 515 | Find Largest Value In Each Tree Row | java/py/js | Medium |
| 199 | Binary Tree Right Side View | java/py/js | Medium |
| 147 | Insertion Sort List | java/py/js | Medium |
| 495 | Teemo Attacking | java/py/js | Medium |
| 56 | Merge Intervals | java/py/js | Medium |
| 11 | Container With Most Water | java/py/js | Medium |
| 338 | Counting Bits | java/py/js | Medium |
| 287 | Find The Duplicate Number | java/py/js | Medium |
| 807 | Max Increase To Keep City Skyline | java/py/js | Medium |
| 54 | Spiral Matrix | java/py/js | Medium |
| 59 | Spiral Matrix II | java/py/js | Medium |
| 885 | Spiral Matrix III | java/py/js | Medium |
| 19 | Remove Nth Node From End Of List | java/py/js | Medium |
| 526 | Beautiful Arrangement | java/py/js | Medium |
| 814 | Binary Tree Pruning | java/py/js | Medium |
| 150 | Evaluate Reverse Polish Notation | java/py/js | Medium |
| 341 | Flatten Nested List Iterator | java/py/js | Medium |
| 856 | Score Of Parentheses | java/py/js | Medium |
| 725 | Split Linked List In Parts | java/py/js | Medium |
| 86 | Partition List | java/py/js | Medium |
| 2 | Add Two Numbers | java/py/js | Medium |
| 445 | Add Two Numbers II | java/py/js | Medium |
| 817 | Linked List Components | java/py/js | Medium |
| 430 | Flatten A Multilevel Doubly Linked List | java/py | Medium |
| 138 | Copy List With Random Pointer | java/py/js | Medium |
| 62 | Unique Paths | java/py/js | Medium |
| 63 | Unique Paths II | java/py/js | Medium |
| 162 | Find Peak Element | java/py/js | Medium |
| 200 | Number Of Islands | java/py/js | Medium |
| 223 | Rectangle Area | java/py/js | Medium |
| 419 | Battleships In A Board | java/py/js | Medium |
| 129 | Sum Root To Leaf Numbers | java/py/js | Medium |
| 537 | Complex Number Multiplication | java/py/js | Medium |
| 228 | Summary Ranges | java/py/js | Medium |
| 890 | Find And Replace Pattern | java/py/js | Medium |
| 48 | Rotate Image | java/py/js | Medium |
| 74 | Search A 2d Matrix | java/py/js | Medium |
| 153 | Find Minimum In Rotated Sorted Array | java/py/js | Medium |
| 34 | Find First And Last Position Of Element In Sorted Array | java/py/js | Medium |
| 75 | Sort Colors | java/py/js | Medium |
| 623 | Add One Row To Tree | java/py/js | Medium |
| 513 | Find Bottom Left Tree Value | java/py/js | Medium |
| 103 | Binary Tree Zigzag Level Order Traversal | java/py/js | Medium |
| 134 | Gas Station | java/py/js | Medium |
| 238 | Product Of Array Except Self | java/py/js | Medium |
| 896 | Monotonic Array | java/py/js | Easy |
| 739 | Daily Temperatures | java/py/js | Medium |
| 921 | Minimum Add To Make Parentheses Valid | java/py/js | Medium |
| 797 | All Paths From Source To Target | java/py/js | Medium |
| 789 | Escape The Ghosts | java/py/js | Medium |
| 701 | Insert Into A Binary Search Tree | java/py/js | Medium |
| 165 | Compare Version Numbers | java/py/js | Medium |
| 8 | String To Integer Atoi | java/py/js | Medium |
| 299 | Bulls And Cows | java/py/js | Medium |
| 394 | Decode String | java/py/js | Medium |
| 938 | Range Sum Of Bst | java/py/js | Medium |
| 71 | Simplify Path | java/py/js | Medium |
| 451 | Sort Characters By Frequency | java/py/js | Medium |
| 215 | Kth Largest Element In An Array | java/py/js | Medium |
| 347 | Top K Frequent Elements | java/py/js | Medium |
| 692 | Top K Frequent Words | java/py/js | Medium |