Right now I work in Google and would like to give reference for job application. Please send the CV to my email address bozhaoli.usc@gmail.com.
Unsubscribed the Leetocode membership so this repo is valid until 04/2018
There is the collection of each company's tag questions on Leetcode. Welcome to contribute other company's questions based on this format.
To be Continue
-Facebook
-Google
-Uber
-Bloomberg
-Microsoft
-Amazon
-Linkedin
| Title | Acceptance | Difficulty | Frequency |
|---|---|---|---|
| 534 | Design TinyURL | 0.0% | Medium |
| 283 | Move Zeroes | 50.7% | Easy |
| 301 | Remove Invalid Parentheses | 35.5% | Hard |
| 273 | Integer to English Words | 22.4% | Hard |
| 621 | Task Scheduler | 42.2% | Medium |
| 67 | Add Binary | 33.2% | Easy |
| 689 | Maximum Sum of 3 Non-Overlapping Subarrays | 41.3% | Hard |
| 325 | Maximum Size Subarray Sum Equals k | 43.0% | Medium |
| 253 | Meeting Rooms II | 39.3% | Medium |
| 17 | Letter Combinations of a Phone Number | 35.4% | Medium |
| 91 | Decode Ways | 20.0% | Medium |
| 311 | Sparse Matrix Multiplication | 51.8% | Medium |
| 314 | Binary Tree Vertical Order Traversal | 37.3% | Medium |
| 297 | Serialize and Deserialize Binary Tree | 34.0% | Hard |
| 10 | Regular Expression Matching | 24.3% | Hard |
| 15 | 3Sum | 21.8% | Medium |
| 158 | Read N Characters Given Read4 II - Call multiple times | 24.5% | Hard |
| 277 | Find the Celebrity | 35.6% | Medium |
| 278 | First Bad Version | 25.8% | Easy |
| 200 | Number of Islands | 35.6% | Medium |
| 76 | Minimum Window Substring | 26.1% | Hard |
| 257 | Binary Tree Paths | 39.7% | Easy |
| 543 | Diameter of Binary Tree | 44.7% | Easy |
| 157 | Read N Characters Given Read4 | 29.2% | Easy |
| 282 | Expression Add Operators | 30.2% | Hard |
| 23 | Merge k Sorted Lists | 27.7% | Hard |
| 173 | Binary Search Tree Iterator | 42.4% | Medium |
| 121 | Best Time to Buy and Sell Stock | 42.1% | Easy |
| 211 | Add and Search Word - Data structure design | 24.1% | Medium |
| 56 | Merge Intervals | 31.0% | Medium |
| 1 | Two Sum | 36.1% | Easy |
| 125 | Valid Palindrome | 26.6% | Easy |
| 161 | One Edit Distance | 31.6% | Medium |
| 597 | Friend Requests I: Overall Acceptance Rate | 37.3% | Easy |
| 252 | Meeting Rooms | 48.3% | Easy |
| 341 | Flatten Nested List Iterator | 42.2% | Medium |
| 285 | Inorder Successor in BST | 36.3% | Medium |
| 98 | Validate Binary Search Tree | 23.8% | Medium |
| 43 | Multiply Strings | 27.6% | Medium |
| 78 | Subsets | 42.5% | Medium |
| 602 | Friend Requests II: Who Has the Most Friends | 41.3% | Medium |
| 139 | Word Break | 30.8% | Medium |
| 670 | Maximum Swap | 38.3% | Medium |
| 57 | Insert Interval | 28.3% | Hard |
| 215 | Kth Largest Element in an Array | 39.9% | Medium |
| 75 | Sort Colors | 38.4% | Medium |
| 133 | Clone Graph | 25.1% | Medium |
| 680 | Valid Palindrome II | 32.2% | Easy |
| 33 | Search in Rotated Sorted Array | 32.0% | Medium |
| 238 | Product of Array Except Self | 49.8% | Medium |
| 636 | Exclusive Time of Functions | 43.9% | Medium |
| 88 | Merge Sorted Array | 32.1% | Easy |
| 206 | Reverse Linked List | 46.1% | Easy |
| 79 | Word Search | 27.4% | Medium |
| 13 | Roman to Integer | 46.8% | Easy |
| 236 | Lowest Common Ancestor of a Binary Tree | 30.0% | Medium |
| 146 | LRU Cache | 18.7% | Hard |
| 494 | Target Sum | 43.6% | Medium |
| 523 | Continuous Subarray Sum | 23.2% | Medium |
| 477 | Total Hamming Distance | 47.7% | Medium |
| 642 | Design Search Autocomplete System | 30.7% | Hard |
| 38 | Count and Say | 35.7% | Easy |
| 554 | Brick Wall | 46.1% | Medium |
| 398 | Random Pick Index | 43.9% | Medium |
| 218 | The Skyline Problem | 28.2% | Hard |
| 49 | Group Anagrams | 36.4% | Medium |
| 286 | Walls and Gates | 44.8% | Medium |
| 209 | Minimum Size Subarray Sum | 31.4% | Medium |
| 208 | Implement Trie (Prefix Tree) | 29.5% | Medium |
| 102 | Binary Tree Level Order Traversal | 41.0% | Medium |
| 71 | Simplify Path | 25.8% | Medium |
| 20 | Valid Parentheses | 33.7% | Easy |
| 28 | Implement strStr() | 28.6% | Easy |
| 90 | Subsets II | 37.2% | Medium |
| 128 | Longest Consecutive Sequence | 37.5% | Hard |
| 127 | Word Ladder | 19.7% | Medium |
| 377 | Combination Sum IV | 42.4% | Medium |
| 380 | Insert Delete GetRandom O(1) | 39.4% | Medium |
| 44 | Wildcard Matching | 20.6% | Hard |
| 334 | Increasing Triplet Subsequence | 39.8% | Medium |
| 269 | Alien Dictionary | 25.2% | Hard |
| 639 | Decode Ways II | 24.3% | Hard |
| 461 | Hamming Distance | 69.8% | Easy |
| 235 | Lowest Common Ancestor of a Binary Search Tree | 39.5% | Easy |
| 674 | Longest Continuous Increasing Subsequence | 42.9% | Easy |
| 647 | Palindromic Substrings | 55.7% | Medium |
| 117 | Populating Next Right Pointers in Each Node II | 33.8% | Medium |
| 50 | Pow(x, n) | 26.0% | Medium |
| 85 | Maximal Rectangle | 28.8% | Hard |
| 69 | Sqrt(x) | 28.2% | Easy |
| 68 | Text Justification | 19.6% | Hard |
| 210 | Course Schedule II | 29.1% | Medium |
| 26 | Remove Duplicates from Sorted Array | 35.5% | Easy |
| 221 | Maximal Square | 29.6% | Medium |
| 274 | H-Index | 33.5% | Medium |
| 404 | Sum of Left Leaves | 47.3% | Easy |
| 25 | Reverse Nodes in k-Group | 31.1% | Hard |
| 234 | Palindrome Linked List | 33.1% | Easy |
| 168 | Excel Sheet Column Title | 26.7% | Easy |
| 261 | Graph Valid Tree | 38.1% | Medium |
| 410 | Split Array Largest Sum | 38.6% | Hard |
| 525 | Contiguous Array | 40.9% | Medium |
| 535 | Encode and Decode TinyURL | 74.2% | Medium |
| 572 | Subtree of Another Tree | 40.6% | Easy |
| 265 | Paint House II | 38.1% | Hard |
| 714 | Best Time to Buy and Sell Stock with Transaction Fee | 39.4% | Medium |
| 578 | Get Highest Answer Rate Question | 28.1% | Medium |
| 637 | Average of Levels in Binary Tree | 55.6% | Easy |
| 721 | Accounts Merge | 27.4% | Medium |
| 653 | Two Sum IV - Input is a BST | 50.4% | Easy |
| 673 | Number of Longest Increasing Subsequence | 31.2% | Medium |
| 80 | Remove Duplicates from Sorted Array II | 36.4% | Medium |
| 275 | H-Index II | 34.7% | Medium |
| Title | Acceptance | Difficulty | Frequency |
|---|---|---|---|
| 534 | Design TinyURL | 0.0% | Medium |
| 388 | Longest Absolute File Path | 37.1% | Medium |
| 683 | K Empty Slots | 36.6% | Hard |
| 681 | Next Closest Time | 42.9% | Medium |
| 340 | Longest Substring with At Most K Distinct Characters | 39.2% | Hard |
| 482 | License Key Formatting | 41.8% | Medium |
| 308 | Range Sum Query 2D - Mutable | 24.1% | Hard |
| 346 | Moving Average from Data Stream | 59.5% | Easy |
| 298 | Binary Tree Longest Consecutive Sequence | 41.4% | Medium |
| 418 | Sentence Screen Fitting | 27.8% | Medium |
| 281 | Zigzag Iterator | 51.4% | Medium |
| 425 | Word Squares | 43.5% | Hard |
| 361 | Bomb Enemy | 39.4% | Medium |
| 394 | Decode String | 41.7% | Medium |
| 393 | UTF-8 Validation | 34.7% | Medium |
| 568 | Maximum Vacation Days | 39.1% | Hard |
| 163 | Missing Ranges | 23.8% | Medium |
| 66 | Plus One | 39.1% | Easy |
| 686 | Repeated String Match | 32.9% | Easy |
| 351 | Android Unlock Patterns | 44.3% | Medium |
| 317 | Shortest Distance from All Buildings | 34.4% | Hard |
| 271 | Encode and Decode Strings | 26.2% | Medium |
| 289 | Game of Life | 37.1% | Medium |
| 288 | Unique Word Abbreviation | 17.3% | Medium |
| 305 | Number of Islands II | 39.3% | Hard |
| 200 | Number of Islands | 35.6% | Medium |
| 280 | Wiggle Sort | 57.9% | Medium |
| 616 | Add Bold Tag in String | 38.7% | Medium |
| 259 | 3Sum Smaller | 41.7% | Medium |
| 218 | The Skyline Problem | 28.2% | Hard |
| 399 | Evaluate Division | 41.5% | Medium |
| 159 | Longest Substring with At Most Two Distinct Characters | 41.9% | Hard |
| 246 | Strobogrammatic Number | 40.0% | Easy |
| 329 | Longest Increasing Path in a Matrix | 36.9% | Hard |
| 417 | Pacific Atlantic Water Flow | 34.1% | Medium |
| 406 | Queue Reconstruction by Height | 56.2% | Medium |
| 279 | Perfect Squares | 37.5% | Medium |
| 345 | Reverse Vowels of a String | 38.7% | Easy |
| 56 | Merge Intervals | 31.0% | Medium |
| 687 | Longest Univalue Path | 33.3% | Easy |
| 284 | Peeking Iterator | 35.5% | Medium |
| 247 | Strobogrammatic Number II | 40.5% | Medium |
| 524 | Longest Word in Dictionary through Deleting | 43.3% | Medium |
| 471 | Encode String with Shortest Length | 42.8% | Hard |
| 228 | Summary Ranges | 30.8% | Medium |
| 391 | Perfect Rectangle | 27.1% | Hard |
| 407 | Trapping Rain Water II | 37.6% | Hard |
| 286 | Walls and Gates | 44.8% | Medium |
| 362 | Design Hit Counter | 54.4% | Medium |
| 297 | Serialize and Deserialize Binary Tree | 34.0% | Hard |
| 294 | Flip Game II | 46.6% | Medium |
| 146 | LRU Cache | 18.7% | Hard |
| 380 | Insert Delete GetRandom O(1) | 39.4% | Medium |
| 276 | Paint Fence | 34.7% | Easy |
| 401 | Binary Watch | 44.9% | Easy |
| 295 | Find Median from Data Stream | 28.0% | Hard |
| 249 | Group Shifted Strings | 42.7% | Medium |
| 463 | Island Perimeter | 57.5% | Easy |
| 42 | Trapping Rain Water | 37.2% | Hard |
| 320 | Generalized Abbreviation | 45.5% | Medium |
| 505 | The Maze II | 38.2% | Medium |
| 341 | Flatten Nested List Iterator | 42.2% | Medium |
| 266 | Palindrome Permutation | 57.5% | Easy |
| 315 | Count of Smaller Numbers After Self | 34.8% | Hard |
| 360 | Sort Transformed Array | 44.5% | Medium |
| 411 | Minimum Unique Word Abbreviation | 33.3% | Hard |
| 269 | Alien Dictionary | 25.2% | Hard |
| 239 | Sliding Window Maximum | 33.6% | Hard |
| 389 | Find the Difference | 51.0% | Easy |
| 465 | Optimal Account Balancing | 37.8% | Hard |
| 274 | H-Index | 33.5% | Medium |
| 253 | Meeting Rooms II | 39.3% | Medium |
| 128 | Longest Consecutive Sequence | 37.5% | Hard |
| 20 | Valid Parentheses | 33.7% | Easy |
| 158 | Read N Characters Given Read4 II - Call multiple times | 24.5% | Hard |
| 293 | Flip Game | 56.5% | Easy |
| 139 | Word Break | 30.8% | Medium |
| 415 | Add Strings | 41.5% | Easy |
| 359 | Logger Rate Limiter | 60.1% | Easy |
| 230 | Kth Smallest Element in a BST | 44.5% | Medium |
| 162 | Find Peak Element | 38.1% | Medium |
| 270 | Closest Binary Search Tree Value | 40.1% | Easy |
| 23 | Merge k Sorted Lists | 27.7% | Hard |
| 498 | Diagonal Traverse | 46.1% | Medium |
| 400 | Nth Digit | 30.1% | Easy |
| 490 | The Maze | 43.2% | Medium |
| 318 | Maximum Product of Word Lengths | 44.9% | Medium |
| 10 | Regular Expression Matching | 24.3% | Hard |
| 212 | Word Search II | 24.0% | Hard |
| 240 | Search a 2D Matrix II | 38.8% | Medium |
| 373 | Find K Pairs with Smallest Sums | 30.9% | Medium |
| 4 | Median of Two Sorted Arrays | 22.3% | Hard |
| 369 | Plus One Linked List | 54.8% | Medium |
| 422 | Valid Word Square | 36.4% | Easy |
| 251 | Flatten 2D Vector | 40.9% | Medium |
| 332 | Reconstruct Itinerary | 29.4% | Medium |
| 173 | Binary Search Tree Iterator | 42.4% | Medium |
| 155 | Min Stack | 29.7% | Easy |
| 358 | Rearrange String k Distance Apart | 31.7% | Hard |
| 54 | Spiral Matrix | 26.6% | Medium |
| 587 | Erect the Fence | 32.6% | Hard |
| 679 | 24 Game | 38.9% | Hard |
| 140 | Word Break II | 23.9% | Hard |
| 324 | Wiggle Sort II | 26.2% | Medium |
| 17 | Letter Combinations of a Phone Number | 35.4% | Medium |
| 484 | Find Permutation | 55.1% | Medium |
| 562 | Longest Line of Consecutive One in Matrix | 40.9% | Medium |
| 166 | Fraction to Recurring Decimal | 17.8% | Medium |
| 22 | Generate Parentheses | 46.3% | Medium |
| 409 | Longest Palindrome | 45.5% | Easy |
| 224 | Basic Calculator | 27.8% | Hard |
| 31 | Next Permutation | 28.8% | Medium |
| 676 | Implement Magic Dictionary | 50.0% | Medium |
| 327 | Count of Range Sum | 30.1% | Hard |
| 421 | Maximum XOR of Two Numbers in an Array | 46.9% | Medium |
| 57 | Insert Interval | 28.3% | Hard |
| 503 | Next Greater Element II | 47.3% | Medium |
| 336 | Palindrome Pairs | 26.6% | Hard |
| 684 | Redundant Connection | 39.2% | Medium |
| 133 | Clone Graph | 25.1% | Medium |
| 44 | Wildcard Matching | 20.6% | Hard |
| 50 | Pow(x, n) | 26.0% | Medium |
| 543 | Diameter of Binary Tree | 44.7% | Easy |
| 460 | LFU Cache | 24.4% | Hard |
| 231 | Power of Two | 40.4% | Easy |
| 208 | Implement Trie (Prefix Tree) | 29.5% | Medium |
| 363 | Max Sum of Rectangle No Larger Than K | 33.4% | Hard |
| 354 | Russian Doll Envelopes | 32.3% | Hard |
| 348 | Design Tic-Tac-Toe | 45.8% | Medium |
| 652 | Find Duplicate Subtrees | 35.8% | Medium |
| 444 | Sequence Reconstruction | 19.6% | Medium |
| 309 | Best Time to Buy and Sell Stock with Cooldown | 41.3% | Medium |
| 501 | Find Mode in Binary Search Tree | 37.7% | Easy |
| 382 | Linked List Random Node | 47.1% | Medium |
| 402 | Remove K Digits | 26.0% | Medium |
| 370 | Range Addition | 56.5% | Medium |
| 272 | Closest Binary Search Tree Value II | 39.4% | Hard |
| 475 | Heaters | 29.6% | Easy |
| 214 | Shortest Palindrome | 24.7% | Hard |
| 551 | Student Attendance Record I | 44.1% | Easy |
| 377 | Combination Sum IV | 42.4% | Medium |
| 282 | Expression Add Operators | 30.2% | Hard |
| 302 | Smallest Rectangle Enclosing Black Pixels | 45.9% | Hard |
| 379 | Design Phone Directory | 34.1% | Medium |
| 353 | Design Snake Game | 26.8% | Medium |
| 375 | Guess Number Higher or Lower II | 35.9% | Medium |
| 459 | Repeated Substring Pattern | 38.2% | Easy |
| 356 | Line Reflection | 30.1% | Medium |
| 261 | Graph Valid Tree | 38.1% | Medium |
| 486 | Predict the Winner | 45.1% | Medium |
| 542 | 01 Matrix | 33.0% | Medium |
| 397 | Integer Replacement | 30.2% | Medium |
| 321 | Create Maximum Number | 24.8% | Hard |
| 408 | Valid Word Abbreviation | 28.2% | Easy |
| 368 | Largest Divisible Subset | 33.7% | Medium |
| 378 | Kth Smallest Element in a Sorted Matrix | 45.2% | Medium |
| 530 | Minimum Absolute Difference in BST | 47.1% | Easy |
| 313 | Super Ugly Number | 38.0% | Medium |
| 331 | Verify Preorder Serialization of a Binary Tree | 36.6% | Medium |
| 323 | Number of Connected Components in an Undirected Graph | 48.3% | Medium |
| 451 | Sort Characters By Frequency | 51.1% | Medium |
| 374 | Guess Number Higher or Lower | 35.9% | Easy |
| 448 | Find All Numbers Disappeared in an Array | 51.2% | Easy |
| 310 | Minimum Height Trees | 28.9% | Medium |
| 326 | Power of Three | 40.4% | Easy |
| 257 | Binary Tree Paths | 39.7% | Easy |
| 520 | Detect Capital | 51.9% | Easy |
| 729 | My Calendar I | 36.1% | Medium |
| 469 | Convex Polygon | 33.4% | Medium |
| 474 | Ones and Zeroes | 39.1% | Medium |
| 480 | Sliding Window Median | 31.1% | Hard |
| 481 | Magical String | 45.6% | Medium |
| 483 | Smallest Good Base | 33.4% | Hard |
| 485 | Max Consecutive Ones | 54.0% | Easy |
| 312 | Burst Balloons | 43.2% | Hard |
| 314 | Binary Tree Vertical Order Traversal | 37.3% | Medium |
| 357 | Count Numbers with Unique Digits | 46.1% | Medium |
| 487 | Max Consecutive Ones II | 45.6% | Medium |
| 493 | Reverse Pairs | 20.6% | Hard |
| 494 | Target Sum | 43.6% | Medium |
| 506 | Relative Ranks | 46.6% | Easy |
| 514 | Freedom Trail | 39.1% | Hard |
| 447 | Number of Boomerangs | 45.7% | Easy |
| 521 | Longest Uncommon Subsequence I | 55.9% | Easy |
| 522 | Longest Uncommon Subsequence II | 31.8% | Medium |
| 526 | Beautiful Arrangement | 54.2% | Medium |
| 527 | Word Abbreviation | 41.9% | Hard |
| 316 | Remove Duplicate Letters | 29.9% | Hard |
| 531 | Lonely Pixel I | 55.6% | Medium |
| 533 | Lonely Pixel II | 44.6% | Medium |
| 535 | Encode and Decode TinyURL | 74.2% | Medium |
| 541 | Reverse String II | 43.7% | Easy |
| 330 | Patching Array | 32.3% | Hard |
| 544 | Output Contest Matches | 70.9% | Medium |
| 545 | Boundary of Binary Tree | 31.9% | Medium |
| 549 | Binary Tree Longest Consecutive Sequence II | 41.9% | Medium |
| 552 | Student Attendance Record II | 31.3% | Hard |
| 560 | Subarray Sum Equals K | 40.4% | Medium |
| 569 | Median Employee Salary | 34.2% | Hard |
| 581 | Shortest Unsorted Continuous Subarray | 29.3% | Easy |
| 583 | Delete Operation for Two Strings | 44.2% | Medium |
| 604 | Design Compressed String Iterator | 32.5% | Easy |
| 638 | Shopping Offers | 43.4% | Medium |
| 643 | Maximum Average Subarray I | 37.8% | Easy |
| 644 | Maximum Average Subarray II | 23.0% | Hard |
| 651 | 4 Keys Keyboard | 48.8% | Medium |
| 656 | Coin Path | 25.1% | Hard |
| 657 | Judge Route Circle | 68.6% | Easy |
| 658 | Find K Closest Elements | 35.3% | Medium |
| 659 | Split Array into Consecutive Subsequences | 35.7% | Medium |
| 665 | Non-decreasing Array | 21.1% | Easy |
| 667 | Beautiful Arrangement II | 51.5% | Medium |
| 668 | Kth Smallest Number in Multiplication Table | 37.7% | Hard |
| 685 | Redundant Connection II | 28.4% | Hard |
| 689 | Maximum Sum of 3 Non-Overlapping Subarrays | 41.3% | Hard |
| 719 | Find K-th Smallest Pair Distance | 25.3% | Hard |
| 726 | Number of Atoms | 45.7% | Hard |
| 727 | Minimum Window Subsequence | 29.1% | Hard |
| 731 | My Calendar II | 31.6% | Medium |
| Title | Acceptance | Difficulty | Frequency |
|---|---|---|---|
| 534 | Design TinyURL | 0.0% | Medium |
| 380 | Insert Delete GetRandom O(1) | 39.4% | Medium |
| 291 | Word Pattern II | 38.1% | Hard |
| 262 | Trips and Users | 18.1% | Hard |
| 254 | Factor Combinations | 43.2% | Medium |
| 36 | Valid Sudoku | 36.5% | Medium |
| 297 | Serialize and Deserialize Binary Tree | 34.0% | Hard |
| 636 | Exclusive Time of Functions | 43.9% | Medium |
| 139 | Word Break | 30.8% | Medium |
| 432 | All O`one Data Structure | 28.1% | Hard |
| 146 | LRU Cache | 18.7% | Hard |
| 692 | Top K Frequent Words | 40.6% | Medium |
| 17 | Letter Combinations of a Phone Number | 35.4% | Medium |
| 49 | Group Anagrams | 36.4% | Medium |
| 648 | Replace Words | 47.3% | Medium |
| 249 | Group Shifted Strings | 42.7% | Medium |
| 22 | Generate Parentheses | 46.3% | Medium |
| 54 | Spiral Matrix | 26.6% | Medium |
| 133 | Clone Graph | 25.1% | Medium |
| 535 | Encode and Decode TinyURL | 74.2% | Medium |
| 290 | Word Pattern | 33.2% | Easy |
| 13 | Roman to Integer | 46.8% | Easy |
| 450 | Delete Node in a BST | 37.2% | Medium |
| 10 | Regular Expression Matching | 24.3% | Hard |
| 186 | Reverse Words in a String II | 27.7% | Medium |
| 208 | Implement Trie (Prefix Tree) | 29.5% | Medium |
| 37 | Sudoku Solver | 31.0% | Hard |
| 140 | Word Break II | 23.9% | Hard |
| 39 | Combination Sum | 39.9% | Medium |
| 138 | Copy List with Random Pointer | 26.1% | Medium |
| 23 | Merge k Sorted Lists | 27.7% | Hard |
| 207 | Course Schedule | 32.8% | Medium |
| 230 | Kth Smallest Element in a BST | 44.5% | Medium |
| 1 | Two Sum | 36.1% | Easy |
| 91 | Decode Ways | 20.0% | Medium |
| 78 | Subsets | 42.5% | Medium |
| 337 | House Robber III | 44.0% | Medium |
| 33 | Search in Rotated Sorted Array | 32.0% | Medium |
| 161 | One Edit Distance | 31.6% | Medium |
| 242 | Valid Anagram | 46.9% | Easy |
| 76 | Minimum Window Substring | 26.1% | Hard |
| 24 | Swap Nodes in Pairs | 38.7% | Medium |
| 202 | Happy Number | 41.1% | Easy |
| 206 | Reverse Linked List | 46.1% | Easy |
| 155 | Min Stack | 29.7% | Easy |
| 121 | Best Time to Buy and Sell Stock | 42.1% | Easy |
| 125 | Valid Palindrome | 26.6% | Easy |
| 373 | Find K Pairs with Smallest Sums | 30.9% | Medium |
| 266 | Palindrome Permutation | 57.5% | Easy |
| 104 | Maximum Depth of Binary Tree | 53.4% | Easy |
| 699 | Falling Squares | 36.5% | Hard |
| 690 | Employee Importance | 52.9% | Easy |
| 516 | Longest Palindromic Subsequence | 42.6% | Medium |
| 8 | String to Integer (atoi) | 13.9% | Medium |
| 171 | Excel Sheet Column Number | 47.7% | Easy |
| Title | Acceptance | Difficulty | Frequency |
|---|---|---|---|
| 445 | Add Two Numbers II | 45.9% | Medium |
| 138 | Copy List with Random Pointer | 26.1% | Medium |
| 582 | Kill Process | 49.8% | Medium |
| 121 | Best Time to Buy and Sell Stock | 42.1% | Easy |
| 692 | Top K Frequent Words | 40.6% | Medium |
| 387 | First Unique Character in a String | 47.1% | Easy |
| 1 | Two Sum | 36.1% | Easy |
| 117 | Populating Next Right Pointers in Each Node II | 33.8% | Medium |
| 283 | Move Zeroes | 50.7% | Easy |
| 155 | Min Stack | 29.7% | Easy |
| 20 | Valid Parentheses | 33.7% | Easy |
| 56 | Merge Intervals | 31.0% | Medium |
| 146 | LRU Cache | 18.7% | Hard |
| 42 | Trapping Rain Water | 37.2% | Hard |
| 206 | Reverse Linked List | 46.1% | Easy |
| 122 | Best Time to Buy and Sell Stock II | 47.6% | Easy |
| 50 | Pow(x, n) | 26.0% | Medium |
| 2 | Add Two Numbers | 28.1% | Medium |
| 69 | Sqrt(x) | 28.2% | Easy |
| 62 | Unique Paths | 41.9% | Medium |
| 98 | Validate Binary Search Tree | 23.8% | Medium |
| 160 | Intersection of Two Linked Lists | 30.8% | Easy |
| 268 | Missing Number | 44.3% | Easy |
| 53 | Maximum Subarray | 39.9% | Easy |
| 78 | Subsets | 42.5% | Medium |
| 232 | Implement Queue using Stacks | 37.4% | Easy |
| 7 | Reverse Integer | 24.4% | Easy |
| 287 | Find the Duplicate Number | 43.8% | Medium |
| 215 | Kth Largest Element in an Array | 39.9% | Medium |
| 49 | Group Anagrams | 36.4% | Medium |
| 386 | Lexicographical Numbers | 41.8% | Medium |
| 151 | Reverse Words in a String | 15.7% | Medium |
| 139 | Word Break | 30.8% | Medium |
| 102 | Binary Tree Level Order Traversal | 41.0% | Medium |
| 103 | Binary Tree Zigzag Level Order Traversal | 35.5% | Medium |
| 88 | Merge Sorted Array | 32.1% | Easy |
| 3 | Longest Substring Without Repeating Characters | 24.5% | Medium |
| 208 | Implement Trie (Prefix Tree) | 29.5% | Medium |
| 225 | Implement Stack using Queues | 33.5% | Easy |
| 105 | Construct Binary Tree from Preorder and Inorder Traversal | 32.8% | Medium |
| 141 | Linked List Cycle | 35.3% | Easy |
| 230 | Kth Smallest Element in a BST | 44.5% | Medium |
| 5 | Longest Palindromic Substring | 25.3% | Medium |
| 26 | Remove Duplicates from Sorted Array | 35.5% | Easy |
| 33 | Search in Rotated Sorted Array | 32.0% | Medium |
| 13 | Roman to Integer | 46.8% | Easy |
| 8 | String to Integer (atoi) | 13.9% | Medium |
| 63 | Unique Paths II | 32.0% | Medium |
| 297 | Serialize and Deserialize Binary Tree | 34.0% | Hard |
| 172 | Factorial Trailing Zeroes | 36.5% | Easy |
| 101 | Symmetric Tree | 39.5% | Easy |
| 79 | Word Search | 27.4% | Medium |
| 100 | Same Tree | 47.0% | Easy |
| 189 | Rotate Array | 25.0% | Easy |
| 15 | 3Sum | 21.8% | Medium |
| 110 | Balanced Binary Tree | 37.9% | Easy |
| 547 | Friend Circles | 49.2% | Medium |
| 113 | Path Sum II | 34.5% | Medium |
| 24 | Swap Nodes in Pairs | 38.7% | Medium |
| 443 | String Compression | 37.1% | Easy |
| 16 | 3Sum Closest | 31.3% | Medium |
| 266 | Palindrome Permutation | 57.5% | Easy |
| 556 | Next Greater Element III | 28.9% | Medium |
| 11 | Container With Most Water | 36.8% | Medium |
| 158 | Read N Characters Given Read4 II - Call multiple times | 24.5% | Hard |
| 570 | Managers with at Least 5 Direct Reports | 54.3% | Medium |
| 131 | Palindrome Partitioning | 34.4% | Medium |
| 274 | H-Index | 33.5% | Medium |
| 669 | Trim a Binary Search Tree | 57.8% | Easy |
| 714 | Best Time to Buy and Sell Stock with Transaction Fee | 39.4% | Medium |
| Title | Acceptance | Difficulty | Frequency |
|---|---|---|---|
| 138 | Copy List with Random Pointer | 26.1% | Medium |
| 348 | Design Tic-Tac-Toe | 45.8% | Medium |
| 206 | Reverse Linked List | 46.1% | Easy |
| 419 | Battleships in a Board | 62.3% | Medium |
| 273 | Integer to English Words | 22.4% | Hard |
| 171 | Excel Sheet Column Number | 47.7% | Easy |
| 54 | Spiral Matrix | 26.6% | Medium |
| 186 | Reverse Words in a String II | 27.7% | Medium |
| 88 | Merge Sorted Array | 32.1% | Easy |
| 445 | Add Two Numbers II | 45.9% | Medium |
| 235 | Lowest Common Ancestor of a Binary Search Tree | 39.5% | Easy |
| 1 | Two Sum | 36.1% | Easy |
| 53 | Maximum Subarray | 39.9% | Easy |
| 236 | Lowest Common Ancestor of a Binary Tree | 30.0% | Medium |
| 200 | Number of Islands | 35.6% | Medium |
| 21 | Merge Two Sorted Lists | 39.3% | Easy |
| 297 | Serialize and Deserialize Binary Tree | 34.0% | Hard |
| 103 | Binary Tree Zigzag Level Order Traversal | 35.5% | Medium |
| 218 | The Skyline Problem | 28.2% | Hard |
| 116 | Populating Next Right Pointers in Each Node | 36.9% | Medium |
| 73 | Set Matrix Zeroes | 36.2% | Medium |
| 117 | Populating Next Right Pointers in Each Node II | 33.8% | Medium |
| 151 | Reverse Words in a String | 15.7% | Medium |
| 121 | Best Time to Buy and Sell Stock | 42.1% | Easy |
| 13 | Roman to Integer | 46.8% | Easy |
| 48 | Rotate Image | 40.0% | Medium |
| 75 | Sort Colors | 38.4% | Medium |
| 268 | Missing Number | 44.3% | Easy |
| 20 | Valid Parentheses | 33.7% | Easy |
| 141 | Linked List Cycle | 35.3% | Easy |
| 2 | Add Two Numbers | 28.1% | Medium |
| 238 | Product of Array Except Self | 49.8% | Medium |
| 8 | String to Integer (atoi) | 13.9% | Medium |
| 24 | Swap Nodes in Pairs | 38.7% | Medium |
| 5 | Longest Palindromic Substring | 25.3% | Medium |
| 33 | Search in Rotated Sorted Array | 32.0% | Medium |
| 146 | LRU Cache | 18.7% | Hard |
| 98 | Validate Binary Search Tree | 23.8% | Medium |
| 168 | Excel Sheet Column Title | 26.7% | Easy |
| 153 | Find Minimum in Rotated Sorted Array | 40.3% | Medium |
| 237 | Delete Node in a Linked List | 47.0% | Easy |
| 208 | Implement Trie (Prefix Tree) | 29.5% | Medium |
| 232 | Implement Queue using Stacks | 37.4% | Easy |
| 173 | Binary Search Tree Iterator | 42.4% | Medium |
| 160 | Intersection of Two Linked Lists | 30.8% | Easy |
| 4 | Median of Two Sorted Arrays | 22.3% | Hard |
| 26 | Remove Duplicates from Sorted Array | 35.5% | Easy |
| 174 | Dungeon Game | 23.9% | Hard |
| 212 | Word Search II | 24.0% | Hard |
| 102 | Binary Tree Level Order Traversal | 41.0% | Medium |
| 23 | Merge k Sorted Lists | 27.7% | Hard |
| 285 | Inorder Successor in BST | 36.3% | Medium |
| 191 | Number of 1 Bits | 39.9% | Easy |
| 106 | Construct Binary Tree from Inorder and Postorder Traversal | 32.6% | Medium |
| 25 | Reverse Nodes in k-Group | 31.1% | Hard |
| 215 | Kth Largest Element in an Array | 39.9% | Medium |
| 189 | Rotate Array | 25.0% | Easy |
| 71 | Simplify Path | 25.8% | Medium |
| 387 | First Unique Character in a String | 47.1% | Easy |
| 15 | 3Sum | 21.8% | Medium |
| 567 | Permutation in String | 36.6% | Medium |
| 94 | Binary Tree Inorder Traversal | 47.8% | Medium |
| 204 | Count Primes | 26.6% | Easy |
| 46 | Permutations | 45.3% | Medium |
| 56 | Merge Intervals | 31.0% | Medium |
| 28 | Implement strStr() | 28.6% | Easy |
| 124 | Binary Tree Maximum Path Sum | 26.6% | Hard |
| 101 | Symmetric Tree | 39.5% | Easy |
| 165 | Compare Version Numbers | 20.4% | Medium |
| 91 | Decode Ways | 20.0% | Medium |
| 300 | Longest Increasing Subsequence | 38.7% | Medium |
| 114 | Flatten Binary Tree to Linked List | 35.7% | Medium |
| 270 | Closest Binary Search Tree Value | 40.1% | Easy |
| 79 | Word Search | 27.4% | Medium |
| 125 | Valid Palindrome | 26.6% | Easy |
| 162 | Find Peak Element | 38.1% | Medium |
| 258 | Add Digits | 51.5% | Easy |
| 112 | Path Sum | 34.4% | Easy |
| 55 | Jump Game | 29.5% | Medium |
| 513 | Find Bottom Left Tree Value | 56.1% | Medium |
| 672 | Bulb Switcher II | 47.9% | Medium |
| 722 | Remove Comments | 25.8% | Medium |
| 365 | Water and Jug Problem | 27.7% | Medium |
| 443 | String Compression | 37.1% | Easy |
| 452 | Minimum Number of Arrows to Burst Balloons | 44.4% | Medium |
| 591 | Tag Validator | 30.1% | Hard |
| 631 | Design Excel Sum Formula | 27.6% | Hard |
| 47 | Permutations II | 33.7% | Medium |
| 642 | Design Search Autocomplete System | 30.7% | Hard |
| 650 | 2 Keys Keyboard | 44.5% | Medium |
| 651 | 4 Keys Keyboard | 48.8% | Medium |
| 213 | House Robber II | 34.3% | Medium |
| 654 | Maximum Binary Tree | 69.9% | Medium |
| 333 | Largest BST Subtree | 30.6% | Medium |
| Title | Acceptance | Difficulty | Frequency |
|---|---|---|---|
| 534 | Design TinyURL | 0.0% | Medium |
| 675 | Cut Off Trees for Golf Event | 26.6% | Hard |
| 1 | Two Sum | 36.1% | Easy |
| 20 | Valid Parentheses | 33.7% | Easy |
| 146 | LRU Cache | 18.7% | Hard |
| 711 | Number of Distinct Islands II | 37.7% | Hard |
| 200 | Number of Islands | 35.6% | Medium |
| 48 | Rotate Image | 40.0% | Medium |
| 438 | Find All Anagrams in a String | 33.8% | Easy |
| 297 | Serialize and Deserialize Binary Tree | 34.0% | Hard |
| 138 | Copy List with Random Pointer | 26.1% | Medium |
| 236 | Lowest Common Ancestor of a Binary Tree | 30.0% | Medium |
| 5 | Longest Palindromic Substring | 25.3% | Medium |
| 239 | Sliding Window Maximum | 33.6% | Hard |
| 460 | LFU Cache | 24.4% | Hard |
| 121 | Best Time to Buy and Sell Stock | 42.1% | Easy |
| 17 | Letter Combinations of a Phone Number | 35.4% | Medium |
| 387 | First Unique Character in a String | 47.1% | Easy |
| 42 | Trapping Rain Water | 37.2% | Hard |
| 238 | Product of Array Except Self | 49.8% | Medium |
| 127 | Word Ladder | 19.7% | Medium |
| 23 | Merge k Sorted Lists | 27.7% | Hard |
| 682 | Baseball Game | 58.7% | Easy |
| 206 | Reverse Linked List | 46.1% | Easy |
| 235 | Lowest Common Ancestor of a Binary Search Tree | 39.5% | Easy |
| 380 | Insert Delete GetRandom O(1) | 39.4% | Medium |
| 2 | Add Two Numbers | 28.1% | Medium |
| 234 | Palindrome Linked List | 33.1% | Easy |
| 449 | Serialize and Deserialize BST | 42.4% | Medium |
| 155 | Min Stack | 29.7% | Easy |
| 240 | Search a 2D Matrix II | 38.8% | Medium |
| 98 | Validate Binary Search Tree | 23.8% | Medium |
| 21 | Merge Two Sorted Lists | 39.3% | Easy |
| 139 | Word Break | 30.8% | Medium |
| 215 | Kth Largest Element in an Array | 39.9% | Medium |
| 49 | Group Anagrams | 36.4% | Medium |
| 517 | Super Washing Machines | 36.5% | Hard |
| 126 | Word Ladder II | 14.5% | Hard |
| 3 | Longest Substring Without Repeating Characters | 24.5% | Medium |
| 242 | Valid Anagram | 46.9% | Easy |
| 160 | Intersection of Two Linked Lists | 30.8% | Easy |
| 141 | Linked List Cycle | 35.3% | Easy |
| 529 | Minesweeper | 49.4% | Medium |
| 186 | Reverse Words in a String II | 27.7% | Medium |
| 167 | Two Sum II - Input array is sorted | 47.2% | Easy |
| 15 | 3Sum | 21.8% | Medium |
| 102 | Binary Tree Level Order Traversal | 41.0% | Medium |
| 78 | Subsets | 42.5% | Medium |
| 545 | Boundary of Binary Tree | 31.9% | Medium |
| 516 | Longest Palindromic Subsequence | 42.6% | Medium |
| 73 | Set Matrix Zeroes | 36.2% | Medium |
| 535 | Encode and Decode TinyURL | 74.2% | Medium |
| 199 | Binary Tree Right Side View | 41.6% | Medium |
| 8 | String to Integer (atoi) | 13.9% | Medium |
| 508 | Most Frequent Subtree Sum | 52.2% | Medium |
| 204 | Count Primes | 26.6% | Easy |
| 538 | Convert BST to Greater Tree | 49.1% | Easy |
| 89 | Gray Code | 41.7% | Medium |
| 414 | Third Maximum Number | 28.0% | Easy |
| 189 | Rotate Array | 25.0% | Easy |
| 451 | Sort Characters By Frequency | 51.1% | Medium |
| 355 | Design Twitter | 25.6% | Medium |
| 532 | K-diff Pairs in an Array | 28.2% | Easy |
| 119 | Pascal's Triangle II | 37.5% | Easy |
| 606 | Construct String from Binary Tree | 49.7% | Easy |
| 617 | Merge Two Binary Trees | 67.6% | Easy |
| 645 | Set Mismatch | 40.0% | Easy |
| 537 | Complex Number Multiplication | 64.0% | Medium |
| 646 | Maximum Length of Pair Chain | 47.7% | Medium |
| 662 | Maximum Width of Binary Tree | 38.1% | Medium |
| 396 | Rotate Function | 33.4% | Medium |
| 536 | Construct Binary Tree from String | 42.8% | Medium |
| 663 | Equal Tree Partition | 36.6% | Medium |
| 692 | Top K Frequent Words | 40.6% | Medium |
| 459 | Repeated Substring Pattern | 38.2% | Easy |
| 579 | Find Cumulative Salary of an Employee | 27.0% | Hard |
| 553 | Optimal Division | 55.2% | Medium |
| 694 | Number of Distinct Islands | 43.8% | Medium |
| 661 | Image Smoother | 45.9% | Easy |
| 640 | Solve the Equation | 38.9% | Medium |
| 725 | Split Linked List in Parts | 49.6% | Medium |
| Title | Acceptance | Difficulty | Frequency |
|---|---|---|---|
| 339 | Nested List Weight Sum | 62.8% | Easy |
| 244 | Shortest Word Distance II | 39.5% | Medium |
| 364 | Nested List Weight Sum II | 53.2% | Medium |
| 170 | Two Sum III - Data structure design | 25.4% | Easy |
| 256 | Paint House | 46.2% | Easy |
| 243 | Shortest Word Distance | 52.9% | Easy |
| 156 | Binary Tree Upside Down | 45.1% | Medium |
| 366 | Find Leaves of Binary Tree | 60.3% | Medium |
| 716 | Max Stack | 32.7% | Easy |
| 254 | Factor Combinations | 43.2% | Medium |
| 245 | Shortest Word Distance III | 50.8% | Medium |
| 205 | Isomorphic Strings | 34.3% | Easy |
| 53 | Maximum Subarray | 39.9% | Easy |
| 297 | Serialize and Deserialize Binary Tree | 34.0% | Hard |
| 605 | Can Place Flowers | 30.1% | Easy |
| 698 | Partition to K Equal Sum Subsets | 36.9% | Medium |
| 50 | Pow(x, n) | 26.0% | Medium |
| 65 | Valid Number | 12.8% | Hard |
| 149 | Max Points on a Line | 15.2% | Hard |
| 68 | Text Justification | 19.6% | Hard |
| 277 | Find the Celebrity | 35.6% | Medium |
| 56 | Merge Intervals | 31.0% | Medium |
| 102 | Binary Tree Level Order Traversal | 41.0% | Medium |
| 236 | Lowest Common Ancestor of a Binary Tree | 30.0% | Medium |
| 152 | Maximum Product Subarray | 26.2% | Medium |
| 187 | Repeated DNA Sequences | 32.2% | Medium |
| 1 | Two Sum | 36.1% | Easy |
| 34 | Search for a Range | 31.4% | Medium |
| 311 | Sparse Matrix Multiplication | 51.8% | Medium |
| 150 | Evaluate Reverse Polish Notation | 27.7% | Medium |
| 464 | Can I Win | 25.2% | Medium |
| 33 | Search in Rotated Sorted Array | 32.0% | Medium |
| 46 | Permutations | 45.3% | Medium |
| 76 | Minimum Window Substring | 26.1% | Hard |
| 104 | Maximum Depth of Binary Tree | 53.4% | Easy |
| 238 | Product of Array Except Self | 49.8% | Medium |
| 127 | Word Ladder | 19.7% | Medium |
| 101 | Symmetric Tree | 39.5% | Easy |
| 57 | Insert Interval | 28.3% | Hard |
| 103 | Binary Tree Zigzag Level Order Traversal | 35.5% | Medium |
| 198 | House Robber | 39.4% | Easy |
| 23 | Merge k Sorted Lists | 27.7% | Hard |
| 21 | Merge Two Sorted Lists | 39.3% | Easy |
| 47 | Permutations II | 33.7% | Medium |
| 515 | Find Largest Value in Each Tree Row | 55.1% | Medium |
| 173 | Binary Search Tree Iterator | 42.4% | Medium |
| 633 | Sum of Square Numbers | 32.3% | Easy |
| 647 | Palindromic Substrings | 55.7% | Medium |
| 671 | Second Minimum Node In a Binary Tree | 41.9% | Easy |
| 367 | Valid Perfect Square | 38.5% | Easy |
| 730 | Count Different Palindromic Subsequences | 25.4% | Hard |