my solution for LeetCode
| id | title | language | difficulty |
|---|---|---|---|
| 1 | Two Sum | cpp | easy |
| 2 | Add Two Numbers | cpp | medium |
| 3 | Longest Substring Without Repeating Characters | cpp | medium |
| 4 | Median of Two Sorted Arrays | cpp | hard |
| 5 | Longest Palindromic Substring | cpp | medium |
| 6 | Zigzag Conversion | cpp | medium |
| 7 | Reverse Integer | cpp | medium |
| 8 | String to Integer (atoi) | cpp | medium |
| 9 | Palindrome Number | cpp | easy |
| 10 | Regular Expression Matching | hard | |
| 11 | Container With Most Water | cpp | medium |
| 12 | Integer to Roman | cpp | medium |
| 13 | Roman to Integer | cpp | easy |
| 14 | Longest Common Prefix | cpp | easy |
| 15 | 3Sum | cpp | medium |
| 16 | 3Sum Closest | cpp | medium |
| 17 | Letter Combinations of a Phone Number | cpp | medium |
| 18 | 4Sum | cpp | medium |
| 19 | Remove Nth Node From End of List | cpp | medium |
| 20 | Valid Parentheses | cpp | easy |
| 21 | Merge Two Sorted Lists | cpp | easy |
| 22 | Generate Parentheses | cpp | medium |
| 23 | Merge k Sorted Lists | cpp | hard |
| 24 | Swap Nodes in Pairs | cpp | medium |
| 25 | Reverse Nodes in k-Group | cpp | hard |
| 26 | Remove Duplicates from Sorted Array | cpp | easy |
| 27 | Remove Element | cpp | easy |
| 28 | Find the Index of the First Occurrence in a String | cpp | easy |
| 29 | Divide Two Integers | cpp | medium |
| 30 | Substring with Concatenation of All Words | cpp | hard |
| 31 | Next Permutation | cpp | medium |
| 32 | Longest Valid Parentheses | cpp | hard |
| 33 | Search in Rotated Sorted Array | cpp | medium |
| 34 | Find First and Last Position of Element in Sorted Array | cpp | medium |
| 35 | Search Insert Position | cpp | easy |
| 36 | Valid Sudoku | cpp | medium |
| 37 | Sudoku Solver | cpp | hard |
| 38 | Count and Say | cpp | medium |
| 39 | Combination Sum | cpp | medium |
| 40 | Combination Sum II | cpp | medium |
| 41 | First Missing Positive | cpp | hard |
| 42 | Trapping Rain Water | cpp | hard |
| 43 | Multiply Strings | cpp | medium |
| 44 | Wildcard Matching | cpp | hard |
| 45 | Jump Game II | cpp | medium |
| 46 | Permutations | cpp | medium |
| 47 | Permutations II | cpp | medium |
| 48 | Rotate Image | cpp | medium |
| 49 | Group Anagrams | cpp | medium |
| 50 | Pow(x, n) | cpp | medium |
| 51 | N-Queens | cpp | hard |
| 52 | N-Queens II | cpp | hard |
| 53 | Maximum Subarray | cpp | medium |
| 54 | Spiral Matrix | cpp | medium |
| 55 | Jump Game | cpp | medium |
| 56 | Merge Intervals | cpp | medium |
| 57 | Insert Interval | cpp | medium |
| 58 | Length of Last Word | cpp | easy |
| 59 | Spiral Matrix II | cpp | medium |
| 60 | Permutation Sequence | cpp | hard |
| 61 | Rotate List | cpp | medium |
| 62 | Unique Paths | cpp | medium |
| 63 | Unique Paths II | cpp | medium |
| 64 | Minimum Path Sum | cpp | medium |
| 65 | Valid Number | cpp | hard |
| 66 | Plus One | cpp | easy |
| 67 | Add Binary | cpp | easy |
| 68 | Text Justification | cpp | hard |
| 69 | Sqrt(x) | cpp | easy |
| 70 | Climbing Stairs | cpp | easy |
| 71 | Simplify Path | cpp | medium |
| 72 | Edit Distance | cpp | medium |
| 73 | Set Matrix Zeroes | cpp | medium |
| 74 | Search a 2D Matrix | cpp | medium |
| 75 | Sort Colors | cpp | medium |
| 76 | Minimum Window Substring | cpp | hard |
| 77 | Combinations | cpp | medium |
| 78 | Subsets | cpp | medium |
| 79 | Word Search | cpp | medium |
| 80 | Remove Duplicates from Sorted Array II | cpp | medium |
| 81 | Search in Rotated Sorted Array II | cpp | medium |
| 82 | Remove Duplicates from Sorted List II | cpp | medium |
| 83 | Remove Duplicates from Sorted List | cpp | easy |
| 84 | Largest Rectangle in Histogram | cpp | hard |
| 85 | Maximal Rectangle | hard | |
| 86 | Partition List | cpp | medium |
| 87 | Scramble String | hard | |
| 88 | Merge Sorted Array | cpp | easy |
| 89 | Gray Code | cpp | medium |
| 90 | Subsets II | cpp | medium |
| 91 | Decode Ways | cpp | medium |
| 92 | Reverse Linked List II | cpp | medium |
| 93 | Restore IP Addresses | cpp | medium |
| 94 | Binary Tree Inorder Traversal | cpp | easy |
| 95 | Unique Binary Search Trees II | cpp | medium |
| 96 | Unique Binary Search Trees | cpp | medium |
| 97 | Interleaving String | cpp | medium |
| 98 | Validate Binary Search Tree | cpp | medium |
| 99 | Recover Binary Search Tree | cpp | medium |
| 100 | Same Tree | cpp | easy |
| 101 | Symmetric Tree | cpp | easy |
| 102 | Binary Tree Level Order Traversal | cpp | medium |
| 103 | Binary Tree Zigzag Level Order Traversal | cpp | medium |
| 104 | Maximum Depth of Binary Tree | cpp | easy |
| 105 | Construct Binary Tree from Preorder and Inorder Traversal | cpp | medium |
| 106 | Construct Binary Tree from Inorder and Postorder Traversal | medium | |
| 107 | Binary Tree Level Order Traversal II | cpp | medium |
| 108 | Convert Sorted Array to Binary Search Tree | cpp | easy |
| 109 | Convert Sorted List to Binary Search Tree | cpp | medium |
| 110 | Balanced Binary Tree | cpp | easy |
| 111 | Minimum Depth of Binary Tree | cpp | easy |
| 112 | Path Sum | cpp | easy |
| 113 | Path Sum II | cpp | medium |
| 114 | Flatten Binary Tree to Linked List | cpp | medium |
| 115 | Distinct Subsequences | cpp | hard |
| 116 | Populating Next Right Pointers in Each Node | cpp | medium |
| 117 | Populating Next Right Pointers in Each Node II | cpp | medium |
| 118 | Pascal's Triangle | cpp | easy |
| 119 | Pascal's Triangle II | cpp | easy |
| 120 | Triangle | cpp | medium |
| 121 | Best Time to Buy and Sell Stock | cpp | easy |
| 122 | Best Time to Buy and Sell Stock II | cpp | medium |
| 123 | Best Time to Buy and Sell Stock III | hard | |
| 124 | Binary Tree Maximum Path Sum | cpp | hard |
| 125 | Valid Palindrome | cpp | easy |
| 126 | Word Ladder II | hard | |
| 127 | Word Ladder | cpp | hard |
| 128 | Longest Consecutive Sequence | cpp | medium |
| 129 | Sum Root to Leaf Numbers | cpp | medium |
| 130 | Surrounded Regions | cpp | medium |
| 131 | Palindrome Partitioning | cpp | medium |
| 132 | Palindrome Partitioning II | cpp | hard |
| 133 | Clone Graph | cpp | medium |
| 134 | Gas Station | cpp | medium |
| 135 | Candy | hard | |
| 136 | Single Number | cpp | easy |
| 137 | Single Number II | cpp | medium |
| 138 | Copy List with Random Pointer | cpp | medium |
| 139 | Word Break | cpp | medium |
| 140 | Word Break II | cpp | hard |
| 141 | Linked List Cycle | cpp | easy |
| 142 | Linked List Cycle II | cpp | medium |
| 143 | Reorder List | cpp | medium |
| 144 | Binary Tree Preorder Traversal | cpp | easy |
| 145 | Binary Tree Postorder Traversal | cpp | easy |
| 146 | LRU Cache | cpp | medium |
| 147 | Insertion Sort List | cpp | medium |
| 148 | Sort List | cpp | medium |
| 149 | Max Points on a Line | cpp | hard |
| 150 | Evaluate Reverse Polish Notation | cpp | medium |
| 151 | Reverse Words in a String | cpp | medium |
| 152 | Maximum Product Subarray | cpp | medium |
| 153 | Find Minimum in Rotated Sorted Array | cpp | medium |
| 154 | Find Minimum in Rotated Sorted Array II | hard | |
| 155 | Min Stack | cpp | medium |
| 156 | Binary Tree Upside Down | medium | |
| 157 | Read N Characters Given Read4 | easy | |
| 158 | Read N Characters Given read4 II - Call Multiple Times | hard | |
| 159 | Longest Substring with At Most Two Distinct Characters | medium | |
| 160 | Intersection of Two Linked Lists | cpp | easy |
| 161 | One Edit Distance | medium | |
| 162 | Find Peak Element | cpp | medium |
| 163 | Missing Ranges | easy | |
| 164 | Maximum Gap | cpp | medium |
| 165 | Compare Version Numbers | cpp | medium |
| 166 | Fraction to Recurring Decimal | cpp | medium |
| 167 | Two Sum II - Input Array Is Sorted | cpp | medium |
| 168 | Excel Sheet Column Title | cpp | easy |
| 169 | Majority Element | cpp | easy |
| 170 | Two Sum III - Data structure design | easy | |
| 171 | Excel Sheet Column Number | cpp | easy |
| 172 | Factorial Trailing Zeroes | cpp | medium |
| 173 | Binary Search Tree Iterator | cpp | medium |
| 174 | Dungeon Game | hard | |
| 175 | Combine Two Tables | sql | easy |
| 176 | Second Highest Salary | sql | medium |
| 177 | Nth Highest Salary | sql | medium |
| 178 | Rank Scores | medium | |
| 179 | Largest Number | cpp | medium |
| 180 | Consecutive Numbers | medium | |
| 181 | Employees Earning More Than Their Managers | sql | easy |
| 182 | Duplicate Emails | sql | easy |
| 183 | Customers Who Never Order | sql | easy |
| 184 | Department Highest Salary | sql | medium |
| 185 | Department Top Three Salaries | hard | |
| 186 | Reverse Words in a String II | medium | |
| 187 | Repeated DNA Sequences | cpp | medium |
| 188 | Best Time to Buy and Sell Stock IV | hard | |
| 189 | Rotate Array | cpp | medium |
| 190 | Reverse Bits | cpp | easy |
| 191 | Number of 1 Bits | cpp | easy |
| 192 | Word Frequency | medium | |
| 193 | Valid Phone Numbers | easy | |
| 194 | Transpose File | medium | |
| 195 | Tenth Line | easy | |
| 196 | Delete Duplicate Emails | sql | easy |
| 197 | Rising Temperature | sql | easy |
| 198 | House Robber | cpp | medium |
| 199 | Binary Tree Right Side View | cpp | medium |
| 200 | Number of Islands | cpp | medium |
| 201 | Bitwise AND of Numbers Range | cpp | medium |
| 202 | Happy Number | cpp | easy |
| 203 | Remove Linked List Elements | cpp | easy |
| 204 | Count Primes | cpp | medium |
| 205 | Isomorphic Strings | cpp | easy |
| 206 | Reverse Linked List | cpp | easy |
| 207 | Course Schedule | cpp | medium |
| 208 | Implement Trie (Prefix Tree) | cpp | medium |
| 209 | Minimum Size Subarray Sum | cpp | medium |
| 210 | Course Schedule II | medium | |
| 211 | Design Add and Search Words Data Structure | cpp | medium |
| 212 | Word Search II | cpp | hard |
| 213 | House Robber II | cpp | medium |
| 214 | Shortest Palindrome | hard | |
| 215 | Kth Largest Element in an Array | cpp | medium |
| 216 | Combination Sum III | cpp | medium |
| 217 | Contains Duplicate | cpp | easy |
| 218 | The Skyline Problem | hard | |
| 219 | Contains Duplicate II | cpp | easy |
| 220 | Contains Duplicate III | cpp | hard |
| 221 | Maximal Square | cpp | medium |
| 222 | Count Complete Tree Nodes | cpp | easy |
| 223 | Rectangle Area | cpp | medium |
| 224 | Basic Calculator | hard | |
| 225 | Implement Stack using Queues | cpp | easy |
| 226 | Invert Binary Tree | cpp | easy |
| 227 | Basic Calculator II | medium | |
| 228 | Summary Ranges | cpp | easy |
| 229 | Majority Element II | cpp | medium |
| 230 | Kth Smallest Element in a BST | cpp | medium |
| 231 | Power of Two | cpp | easy |
| 232 | Implement Queue using Stacks | cpp | easy |
| 233 | Number of Digit One | hard | |
| 234 | Palindrome Linked List | cpp | easy |
| 235 | Lowest Common Ancestor of a Binary Search Tree | cpp | medium |
| 236 | Lowest Common Ancestor of a Binary Tree | cpp | medium |
| 237 | Delete Node in a Linked List | cpp | medium |
| 238 | Product of Array Except Self | cpp | medium |
| 239 | Sliding Window Maximum | cpp | hard |
| 240 | Search a 2D Matrix II | cpp | medium |
| 241 | Different Ways to Add Parentheses | cpp | medium |
| 242 | Valid Anagram | cpp | easy |
| 243 | Shortest Word Distance | easy | |
| 244 | Shortest Word Distance II | medium | |
| 245 | Shortest Word Distance III | medium | |
| 246 | Strobogrammatic Number | easy | |
| 247 | Strobogrammatic Number II | medium | |
| 248 | Strobogrammatic Number III | hard | |
| 249 | Group Shifted Strings | medium | |
| 250 | Count Univalue Subtrees | medium | |
| 251 | Flatten 2D Vector | medium | |
| 252 | Meeting Rooms | easy | |
| 253 | Meeting Rooms II | medium | |
| 254 | Factor Combinations | medium | |
| 255 | Verify Preorder Sequence in Binary Search Tree | medium | |
| 256 | Paint House | medium | |
| 257 | Binary Tree Paths | cpp | easy |
| 258 | Add Digits | cpp | easy |
| 259 | 3Sum Smaller | medium | |
| 260 | Single Number III | cpp | medium |
| 261 | Graph Valid Tree | medium | |
| 262 | Trips and Users | hard | |
| 263 | Ugly Number | cpp | easy |
| 264 | Ugly Number II | cpp | medium |
| 265 | Paint House II | hard | |
| 266 | Palindrome Permutation | easy | |
| 267 | Palindrome Permutation II | medium | |
| 268 | Missing Number | cpp | easy |
| 269 | Alien Dictionary | hard | |
| 270 | Closest Binary Search Tree Value | easy | |
| 271 | Encode and Decode Strings | medium | |
| 272 | Closest Binary Search Tree Value II | hard | |
| 273 | Integer to English Words | hard | |
| 274 | H-Index | cpp | medium |
| 275 | H-Index II | cpp | medium |
| 276 | Paint Fence | medium | |
| 277 | Find the Celebrity | medium | |
| 278 | First Bad Version | cpp | easy |
| 279 | Perfect Squares | cpp | medium |
| 280 | Wiggle Sort | medium | |
| 281 | Zigzag Iterator | medium | |
| 282 | Expression Add Operators | hard | |
| 283 | Move Zeroes | cpp | easy |
| 284 | Peeking Iterator | cpp | medium |
| 285 | Inorder Successor in BST | medium | |
| 286 | Walls and Gates | medium | |
| 287 | Find the Duplicate Number | cpp | medium |
| 288 | Unique Word Abbreviation | medium | |
| 289 | Game of Life | cpp | medium |
| 290 | Word Pattern | cpp | easy |
| 291 | Word Pattern II | medium | |
| 292 | Nim Game | cpp | easy |
| 293 | Flip Game | easy | |
| 294 | Flip Game II | medium | |
| 295 | Find Median from Data Stream | cpp | hard |
| 296 | Best Meeting Point | hard | |
| 297 | Serialize and Deserialize Binary Tree | cpp | hard |
| 298 | Binary Tree Longest Consecutive Sequence | medium | |
| 299 | Bulls and Cows | cpp | medium |
| 300 | Longest Increasing Subsequence | cpp | medium |
| 301 | Remove Invalid Parentheses | cpp | hard |
| 302 | Smallest Rectangle Enclosing Black Pixels | hard | |
| 303 | Range Sum Query - Immutable | cpp | easy |
| 304 | Range Sum Query 2D - Immutable | cpp | medium |
| 305 | Number of Islands II | hard | |
| 306 | Additive Number | cpp | medium |
| 307 | Range Sum Query - Mutable | cpp | medium |
| 308 | Range Sum Query 2D - Mutable | medium | |
| 309 | Best Time to Buy and Sell Stock with Cooldown | medium | |
| 310 | Minimum Height Trees | medium | |
| 311 | Sparse Matrix Multiplication | medium | |
| 312 | Burst Balloons | hard | |
| 313 | Super Ugly Number | cpp | medium |
| 314 | Binary Tree Vertical Order Traversal | medium | |
| 315 | Count of Smaller Numbers After Self | hard | |
| 316 | Remove Duplicate Letters | cpp | medium |
| 317 | Shortest Distance from All Buildings | hard | |
| 318 | Maximum Product of Word Lengths | cpp | medium |
| 319 | Bulb Switcher | cpp | medium |
| 320 | Generalized Abbreviation | medium | |
| 321 | Create Maximum Number | hard | |
| 322 | Coin Change | cpp | medium |
| 323 | Number of Connected Components in an Undirected Graph | medium | |
| 324 | Wiggle Sort II | cpp | medium |
| 325 | Maximum Size Subarray Sum Equals k | medium | |
| 326 | Power of Three | cpp | easy |
| 327 | Count of Range Sum | hard | |
| 328 | Odd Even Linked List | cpp | medium |
| 329 | Longest Increasing Path in a Matrix | cpp | hard |
| 330 | Patching Array | hard | |
| 331 | Verify Preorder Serialization of a Binary Tree | cpp | medium |
| 332 | Reconstruct Itinerary | hard | |
| 333 | Largest BST Subtree | medium | |
| 334 | Increasing Triplet Subsequence | cpp | medium |
| 335 | Self Crossing | hard | |
| 336 | Palindrome Pairs | cpp | hard |
| 337 | House Robber III | cpp | medium |
| 338 | Counting Bits | cpp | easy |
| 339 | Nested List Weight Sum | medium | |
| 340 | Longest Substring with At Most K Distinct Characters | medium | |
| 341 | Flatten Nested List Iterator | medium | |
| 342 | Power of Four | cpp | easy |
| 343 | Integer Break | cpp | medium |
| 344 | Reverse String | cpp | easy |
| 345 | Reverse Vowels of a String | cpp | easy |
| 346 | Moving Average from Data Stream | easy | |
| 347 | Top K Frequent Elements | cpp | medium |
| 348 | Design Tic-Tac-Toe | medium | |
| 349 | Intersection of Two Arrays | cpp | easy |
| 350 | Intersection of Two Arrays II | cpp | easy |
| 351 | Android Unlock Patterns | medium | |
| 352 | Data Stream as Disjoint Intervals | hard | |
| 353 | Design Snake Game | medium | |
| 354 | Russian Doll Envelopes | hard | |
| 355 | Design Twitter | cpp | medium |
| 356 | Line Reflection | medium | |
| 357 | Count Numbers with Unique Digits | cpp | medium |
| 358 | Rearrange String k Distance Apart | hard | |
| 359 | Logger Rate Limiter | easy | |
| 360 | Sort Transformed Array | medium | |
| 361 | Bomb Enemy | medium | |
| 362 | Design Hit Counter | medium | |
| 363 | Max Sum of Rectangle No Larger Than K | hard | |
| 364 | Nested List Weight Sum II | medium | |
| 365 | Water and Jug Problem | cpp | medium |
| 366 | Find Leaves of Binary Tree | medium | |
| 367 | Valid Perfect Square | cpp | easy |
| 368 | Largest Divisible Subset | medium | |
| 369 | Plus One Linked List | medium | |
| 370 | Range Addition | medium | |
| 371 | Sum of Two Integers | cpp | medium |
| 372 | Super Pow | medium | |
| 373 | Find K Pairs with Smallest Sums | medium | |
| 374 | Guess Number Higher or Lower | cpp | easy |
| 375 | Guess Number Higher or Lower II | medium | |
| 376 | Wiggle Subsequence | cpp | medium |
| 377 | Combination Sum IV | cpp | medium |
| 378 | Kth Smallest Element in a Sorted Matrix | cpp | medium |
| 379 | Design Phone Directory | medium | |
| 380 | Insert Delete GetRandom O(1) | cpp | medium |
| 381 | Insert Delete GetRandom O(1) - Duplicates allowed | hard | |
| 382 | Linked List Random Node | cpp | medium |
| 383 | Ransom Note | cpp | easy |
| 384 | Shuffle an Array | cpp | medium |
| 385 | Mini Parser | medium | |
| 386 | Lexicographical Numbers | cpp | medium |
| 387 | First Unique Character in a String | cpp | easy |
| 388 | Longest Absolute File Path | cpp | medium |
| 389 | Find the Difference | cpp | easy |
| 390 | Elimination Game | cpp | medium |
| 391 | Perfect Rectangle | hard | |
| 392 | Is Subsequence | cpp | easy |
| 393 | UTF-8 Validation | cpp | medium |
| 394 | Decode String | cpp | medium |
| 395 | Longest Substring with At Least K Repeating Characters | cpp | medium |
| 396 | Rotate Function | cpp | medium |
| 397 | Integer Replacement | cpp | medium |
| 398 | Random Pick Index | cpp | medium |
| 399 | Evaluate Division | cpp | medium |
| 400 | Nth Digit | cpp | medium |
| 401 | Binary Watch | cpp | easy |
| 402 | Remove K Digits | cpp | medium |
| 403 | Frog Jump | cpp | hard |
| 404 | Sum of Left Leaves | cpp | easy |
| 405 | Convert a Number to Hexadecimal | cpp | easy |
| 406 | Queue Reconstruction by Height | cpp | medium |
| 407 | Trapping Rain Water II | hard | |
| 408 | Valid Word Abbreviation | easy | |
| 409 | Longest Palindrome | cpp | easy |
| 410 | Split Array Largest Sum | cpp | hard |
| 411 | Minimum Unique Word Abbreviation | hard | |
| 412 | Fizz Buzz | cpp | easy |
| 413 | Arithmetic Slices | cpp | medium |
| 414 | Third Maximum Number | cpp | easy |
| 415 | Add Strings | cpp | easy |
| 416 | Partition Equal Subset Sum | cpp | medium |
| 417 | Pacific Atlantic Water Flow | medium | |
| 418 | Sentence Screen Fitting | medium | |
| 419 | Battleships in a Board | cpp | medium |
| 420 | Strong Password Checker | hard | |
| 421 | Maximum XOR of Two Numbers in an Array | cpp | medium |
| 422 | Valid Word Square | easy | |
| 423 | Reconstruct Original Digits from English | cpp | medium |
| 424 | Longest Repeating Character Replacement | cpp | medium |
| 425 | Word Squares | hard | |
| 432 | All O`one Data Structure | hard | |
| 433 | Minimum Genetic Mutation | medium | |
| 434 | Number of Segments in a String | cpp | easy |
| 435 | Non-overlapping Intervals | medium | |
| 436 | Find Right Interval | medium | |
| 437 | Path Sum III | cpp | medium |
| 438 | Find All Anagrams in a String | cpp | medium |
| 439 | Ternary Expression Parser | medium | |
| 440 | K-th Smallest in Lexicographical Order | hard | |
| 441 | Arranging Coins | cpp | easy |
| 442 | Find All Duplicates in an Array | cpp | medium |
| 443 | String Compression | cpp | medium |
| 444 | Sequence Reconstruction | medium | |
| 445 | Add Two Numbers II | cpp | medium |
| 446 | Arithmetic Slices II - Subsequence | hard | |
| 447 | Number of Boomerangs | cpp | medium |
| 448 | Find All Numbers Disappeared in an Array | cpp | easy |
| 449 | Serialize and Deserialize BST | cpp | medium |
| 450 | Delete Node in a BST | cpp | medium |
| 451 | Sort Characters By Frequency | cpp | medium |
| 452 | Minimum Number of Arrows to Burst Balloons | medium | |
| 453 | Minimum Moves to Equal Array Elements | cpp | medium |
| 454 | 4Sum II | cpp | medium |
| 455 | Assign Cookies | cpp | easy |
| 456 | 132 Pattern | cpp | medium |
| 457 | Circular Array Loop | cpp | medium |
| 458 | Poor Pigs | hard | |
| 459 | Repeated Substring Pattern | cpp | easy |
| 460 | LFU Cache | cpp | hard |
| 461 | Hamming Distance | cpp | easy |
| 462 | Minimum Moves to Equal Array Elements II | cpp | medium |
| 463 | Island Perimeter | cpp | easy |
| 464 | Can I Win | cpp | medium |
| 465 | Optimal Account Balancing | hard | |
| 466 | Count The Repetitions | hard | |
| 467 | Unique Substrings in Wraparound String | medium | |
| 468 | Validate IP Address | medium | |
| 469 | Convex Polygon | medium | |
| 471 | Encode String with Shortest Length | hard | |
| 472 | Concatenated Words | hard | |
| 473 | Matchsticks to Square | cpp | medium |
| 474 | Ones and Zeroes | medium | |
| 475 | Heaters | cpp | medium |
| 476 | Number Complement | cpp | easy |
| 477 | Total Hamming Distance | cpp | medium |
| 479 | Largest Palindrome Product | hard | |
| 480 | Sliding Window Median | hard | |
| 481 | Magical String | medium | |
| 482 | License Key Formatting | cpp | easy |
| 483 | Smallest Good Base | hard | |
| 484 | Find Permutation | medium | |
| 485 | Max Consecutive Ones | cpp | easy |
| 486 | Predict the Winner | medium | |
| 487 | Max Consecutive Ones II | medium | |
| 488 | Zuma Game | hard | |
| 489 | Kth Smallest Instructions | hard | |
| 490 | The Maze | medium | |
| 491 | Non-decreasing Subsequences | cpp | medium |
| 492 | Construct the Rectangle | cpp | easy |
| 493 | Reverse Pairs | hard | |
| 494 | Target Sum | cpp | medium |
| 495 | Teemo Attacking | cpp | easy |
| 496 | Next Greater Element I | cpp | easy |
| 498 | Diagonal Traverse | cpp | medium |
| 499 | The Maze III | hard | |
| 500 | Keyboard Row | cpp | easy |
| 501 | Find Mode in Binary Search Tree | cpp | easy |
| 502 | IPO | hard | |
| 503 | Next Greater Element II | medium | |
| 504 | Base 7 | cpp | easy |
| 505 | The Maze II | medium | |
| 506 | Relative Ranks | cpp | easy |
| 507 | Perfect Number | cpp | easy |
| 508 | Most Frequent Subtree Sum | cpp | medium |
| 509 | Inorder Successor in BST II | cpp | medium |
| 510 | Count Subarrays With More Ones Than Zeros | medium | |
| 511 | All Paths from Source Lead to Destination | medium | |
| 512 | Maximum Alternating Subarray Sum | medium | |
| 513 | Find Bottom Left Tree Value | cpp | medium |
| 514 | Freedom Trail | hard | |
| 515 | Find Largest Value in Each Tree Row | cpp | medium |
| 516 | Longest Palindromic Subsequence | medium | |
| 517 | Super Washing Machines | hard | |
| 518 | Coin Change II | medium | |
| 519 | Widest Pair of Indices With Equal Range Sum | medium | |
| 520 | Detect Capital | cpp | easy |
| 521 | Longest Uncommon Subsequence I | cpp | easy |
| 522 | Longest Uncommon Subsequence II | medium | |
| 523 | Continuous Subarray Sum | cpp | medium |
| 524 | Longest Word in Dictionary through Deleting | cpp | medium |
| 525 | Contiguous Array | cpp | medium |
| 526 | Beautiful Arrangement | cpp | medium |
| 527 | Word Abbreviation | hard | |
| 528 | Swapping Nodes in a Linked List | medium | |
| 529 | Minesweeper | cpp | medium |
| 530 | Minimum Absolute Difference in BST | cpp | easy |
| 531 | Lonely Pixel I | medium | |
| 532 | K-diff Pairs in an Array | cpp | medium |
| 533 | Lonely Pixel II | medium | |
| 535 | Encode and Decode TinyURL | medium | |
| 536 | Construct Binary Tree from String | medium | |
| 537 | Complex Number Multiplication | cpp | medium |
| 538 | Convert BST to Greater Tree | cpp | medium |
| 539 | Minimum Time Difference | cpp | medium |
| 540 | Single Element in a Sorted Array | cpp | medium |
| 541 | Reverse String II | cpp | easy |
| 542 | 01 Matrix | cpp | medium |
| 543 | Diameter of Binary Tree | cpp | easy |
| 544 | Output Contest Matches | medium | |
| 545 | Boundary of Binary Tree | medium | |
| 546 | Remove Boxes | hard | |
| 547 | Number of Provinces | cpp | medium |
| 548 | Split Array with Equal Sum | hard | |
| 549 | Binary Tree Longest Consecutive Sequence II | medium | |
| 550 | Shortest Path to Get Food | medium | |
| 551 | Student Attendance Record I | cpp | easy |
| 552 | Student Attendance Record II | hard | |
| 553 | Optimal Division | cpp | medium |
| 554 | Brick Wall | cpp | medium |
| 555 | Split Concatenated Strings | medium | |
| 556 | Next Greater Element III | medium | |
| 557 | Reverse Words in a String III | cpp | easy |
| 560 | Subarray Sum Equals K | cpp | medium |
| 561 | Array Partition | cpp | easy |
| 562 | Longest Line of Consecutive One in Matrix | medium | |
| 563 | Binary Tree Tilt | cpp | easy |
| 564 | Find the Closest Palindrome | hard | |
| 565 | Array Nesting | cpp | medium |
| 566 | Reshape the Matrix | cpp | easy |
| 567 | Permutation in String | cpp | medium |
| 568 | Maximum Vacation Days | hard | |
| 569 | Median Employee Salary | hard | |
| 570 | Managers with at Least 5 Direct Reports | medium | |
| 571 | Find Median Given Frequency of Numbers | hard | |
| 572 | Subtree of Another Tree | cpp | easy |
| 573 | Squirrel Simulation | medium | |
| 574 | Winning Candidate | medium | |
| 575 | Distribute Candies | cpp | easy |
| 576 | Out of Boundary Paths | medium | |
| 577 | Employee Bonus | easy | |
| 578 | Get Highest Answer Rate Question | medium | |
| 579 | Find Cumulative Salary of an Employee | hard | |
| 580 | Count Student Number in Departments | medium | |
| 581 | Shortest Unsorted Continuous Subarray | cpp | medium |
| 582 | Kill Process | medium | |
| 583 | Delete Operation for Two Strings | cpp | medium |
| 584 | Find Customer Referee | easy | |
| 585 | Investments in 2016 | medium | |
| 586 | Customer Placing the Largest Number of Orders | easy | |
| 587 | Erect the Fence | hard | |
| 588 | Design In-Memory File System | hard | |
| 591 | Tag Validator | hard | |
| 592 | Fraction Addition and Subtraction | cpp | medium |
| 593 | Valid Square | cpp | medium |
| 594 | Longest Harmonious Subsequence | cpp | easy |
| 595 | Big Countries | easy | |
| 596 | Classes More Than 5 Students | easy | |
| 597 | Friend Requests I: Overall Acceptance Rate | easy | |
| 598 | Range Addition II | cpp | easy |
| 599 | Minimum Index Sum of Two Lists | cpp | easy |
| 600 | Non-negative Integers without Consecutive Ones | hard | |
| 601 | Human Traffic of Stadium | hard | |
| 602 | Friend Requests II: Who Has the Most Friends | medium | |
| 603 | Consecutive Available Seats | easy | |
| 604 | Design Compressed String Iterator | cpp | easy |
| 605 | Can Place Flowers | cpp | easy |
| 606 | Construct String from Binary Tree | cpp | medium |
| 607 | Sales Person | easy | |
| 608 | Tree Node | medium | |
| 609 | Find Duplicate File in System | cpp | medium |
| 610 | Triangle Judgement | easy | |
| 611 | Valid Triangle Number | medium | |
| 612 | Shortest Distance in a Plane | medium | |
| 613 | Shortest Distance in a Line | easy | |
| 614 | Second Degree Follower | medium | |
| 615 | Average Salary: Departments VS Company | hard | |
| 616 | Add Bold Tag in String | medium | |
| 617 | Merge Two Binary Trees | cpp | easy |
| 618 | Students Report By Geography | hard | |
| 619 | Biggest Single Number | easy | |
| 620 | Not Boring Movies | easy | |
| 621 | Task Scheduler | cpp | medium |
| 623 | Add One Row to Tree | cpp | medium |
| 624 | Maximum Distance in Arrays | medium | |
| 625 | Minimum Factorization | medium | |
| 626 | Exchange Seats | medium | |
| 627 | Swap Salary | easy | |
| 628 | Maximum Product of Three Numbers | cpp | easy |
| 629 | K Inverse Pairs Array | hard | |
| 630 | Course Schedule III | hard | |
| 631 | Design Excel Sum Formula | hard | |
| 632 | Smallest Range Covering Elements from K Lists | hard | |
| 633 | Sum of Square Numbers | cpp | medium |
| 634 | Find the Derangement of An Array | medium | |
| 635 | Design Log Storage System | medium | |
| 636 | Exclusive Time of Functions | cpp | medium |
| 637 | Average of Levels in Binary Tree | cpp | easy |
| 638 | Shopping Offers | medium | |
| 639 | Decode Ways II | hard | |
| 640 | Solve the Equation | medium | |
| 642 | Design Search Autocomplete System | hard | |
| 643 | Maximum Average Subarray I | cpp | easy |
| 644 | Maximum Average Subarray II | hard | |
| 645 | Set Mismatch | cpp | easy |
| 646 | Maximum Length of Pair Chain | medium | |
| 647 | Palindromic Substrings | cpp | medium |
| 648 | Replace Words | cpp | medium |
| 649 | Dota2 Senate | medium | |
| 650 | 2 Keys Keyboard | cpp | medium |
| 651 | 4 Keys Keyboard | medium | |
| 652 | Find Duplicate Subtrees | medium | |
| 653 | Two Sum IV - Input is a BST | cpp | easy |
| 654 | Maximum Binary Tree | cpp | medium |
| 655 | Print Binary Tree | cpp | medium |
| 656 | Coin Path | hard | |
| 657 | Robot Return to Origin | cpp | easy |
| 658 | Find K Closest Elements | medium | |
| 659 | Split Array into Consecutive Subsequences | medium | |
| 660 | Remove 9 | hard | |
| 661 | Image Smoother | cpp | easy |
| 662 | Maximum Width of Binary Tree | medium | |
| 663 | Equal Tree Partition | medium | |
| 664 | Strange Printer | hard | |
| 665 | Non-decreasing Array | cpp | medium |
| 666 | Path Sum IV | medium | |
| 667 | Beautiful Arrangement II | medium | |
| 668 | Kth Smallest Number in Multiplication Table | hard | |
| 669 | Trim a Binary Search Tree | cpp | medium |
| 670 | Maximum Swap | cpp | medium |
| 671 | Second Minimum Node In a Binary Tree | cpp | easy |
| 672 | Bulb Switcher II | medium | |
| 673 | Number of Longest Increasing Subsequence | medium | |
| 674 | Longest Continuous Increasing Subsequence | cpp | easy |
| 675 | Cut Off Trees for Golf Event | hard | |
| 676 | Implement Magic Dictionary | cpp | medium |
| 677 | Map Sum Pairs | cpp | medium |
| 678 | Valid Parenthesis String | medium | |
| 679 | 24 Game | hard | |
| 680 | Valid Palindrome II | cpp | easy |
| 681 | Next Closest Time | medium | |
| 682 | Baseball Game | cpp | easy |
| 683 | K Empty Slots | hard | |
| 684 | Redundant Connection | medium | |
| 685 | Redundant Connection II | hard | |
| 686 | Repeated String Match | cpp | medium |
| 687 | Longest Univalue Path | cpp | medium |
| 688 | Knight Probability in Chessboard | medium | |
| 689 | Maximum Sum of 3 Non-Overlapping Subarrays | hard | |
| 690 | Employee Importance | cpp | medium |
| 691 | Stickers to Spell Word | hard | |
| 692 | Top K Frequent Words | cpp | medium |
| 693 | Binary Number with Alternating Bits | easy | |
| 694 | Number of Distinct Islands | medium | |
| 695 | Max Area of Island | cpp | medium |
| 696 | Count Binary Substrings | cpp | easy |
| 697 | Degree of an Array | cpp | easy |
| 698 | Partition to K Equal Sum Subsets | cpp | medium |
| 699 | Falling Squares | hard | |
| 711 | Number of Distinct Islands II | hard | |
| 712 | Minimum ASCII Delete Sum for Two Strings | cpp | medium |
| 713 | Subarray Product Less Than K | medium | |
| 714 | Best Time to Buy and Sell Stock with Transaction Fee | medium | |
| 715 | Range Module | hard | |
| 716 | Max Stack | hard | |
| 717 | 1-bit and 2-bit Characters | cpp | easy |
| 718 | Maximum Length of Repeated Subarray | cpp | medium |
| 719 | Find K-th Smallest Pair Distance | hard | |
| 720 | Longest Word in Dictionary | cpp | medium |
| 721 | Accounts Merge | medium | |
| 722 | Remove Comments | cpp | medium |
| 723 | Candy Crush | medium | |
| 724 | Find Pivot Index | cpp | easy |
| 725 | Split Linked List in Parts | medium | |
| 726 | Number of Atoms | hard | |
| 727 | Minimum Window Subsequence | hard | |
| 728 | Self Dividing Numbers | cpp | easy |
| 729 | My Calendar I | medium | |
| 730 | Count Different Palindromic Subsequences | hard | |
| 731 | My Calendar II | medium | |
| 732 | My Calendar III | hard | |
| 733 | Flood Fill | cpp | easy |
| 734 | Sentence Similarity | cpp | easy |
| 735 | Asteroid Collision | medium | |
| 736 | Parse Lisp Expression | hard | |
| 737 | Sentence Similarity II | medium | |
| 738 | Monotone Increasing Digits | medium | |
| 739 | Daily Temperatures | cpp | medium |
| 740 | Delete and Earn | cpp | medium |
| 741 | Cherry Pickup | hard | |
| 742 | To Lower Case | easy | |
| 743 | Closest Leaf in a Binary Tree | medium | |
| 744 | Network Delay Time | cpp | medium |
| 745 | Find Smallest Letter Greater Than Target | easy | |
| 746 | Prefix and Suffix Search | cpp | hard |
| 747 | Min Cost Climbing Stairs | cpp | easy |
| 748 | Largest Number At Least Twice of Others | cpp | easy |
| 749 | Shortest Completing Word | easy | |
| 750 | Contain Virus | hard | |
| 751 | Number Of Corner Rectangles | medium | |
| 752 | IP to CIDR | medium | |
| 753 | Open the Lock | medium | |
| 754 | Cracking the Safe | hard | |
| 755 | Reach a Number | medium | |
| 756 | Pour Water | medium | |
| 757 | Pyramid Transition Matrix | medium | |
| 758 | Convert Binary Search Tree to Sorted Doubly Linked List | medium | |
| 759 | Set Intersection Size At Least Two | hard | |
| 760 | Bold Words in String | medium | |
| 761 | Employee Free Time | hard | |
| 762 | Find Anagram Mappings | cpp | easy |
| 763 | Special Binary String | cpp | hard |
| 764 | N-ary Tree Level Order Traversal | medium | |
| 765 | Serialize and Deserialize N-ary Tree | hard | |
| 766 | Flatten a Multilevel Doubly Linked List | cpp | medium |
| 767 | Prime Number of Set Bits in Binary Representation | easy | |
| 768 | Partition Labels | medium | |
| 769 | Largest Plus Sign | medium | |
| 770 | Couples Holding Hands | hard | |
| 771 | Encode N-ary Tree to Binary Tree | cpp | hard |
| 772 | Construct Quad Tree | medium | |
| 773 | Logical OR of Two Binary Grids Represented as Quad-Trees | medium | |
| 774 | Maximum Depth of N-ary Tree | easy | |
| 775 | N-ary Tree Preorder Traversal | easy | |
| 776 | N-ary Tree Postorder Traversal | easy | |
| 777 | Toeplitz Matrix | easy | |
| 778 | Reorganize String | medium | |
| 779 | Max Chunks To Make Sorted II | hard | |
| 780 | Max Chunks To Make Sorted | medium | |
| 781 | Basic Calculator IV | hard | |
| 782 | Jewels and Stones | easy | |
| 783 | Search in a Binary Search Tree | cpp | easy |
| 784 | Insert into a Binary Search Tree | cpp | medium |
| 785 | Basic Calculator III | hard | |
| 786 | Search in a Sorted Array of Unknown Size | medium | |
| 787 | Sliding Puzzle | hard | |
| 788 | Minimize Max Distance to Gas Station | cpp | hard |
| 789 | Kth Largest Element in a Stream | easy | |
| 790 | Global and Local Inversions | medium | |
| 791 | Split BST | cpp | medium |
| 792 | Binary Search | easy | |
| 793 | Swap Adjacent in LR String | medium | |
| 794 | Swim in Rising Water | hard | |
| 795 | K-th Symbol in Grammar | medium | |
| 796 | Reaching Points | cpp | hard |
| 797 | Rabbits in Forest | cpp | medium |
| 798 | Transform to Chessboard | hard | |
| 799 | Minimum Distance Between BST Nodes | easy | |
| 800 | Letter Case Permutation | medium | |
| 801 | Is Graph Bipartite? | medium | |
| 802 | K-th Smallest Prime Fraction | medium | |
| 803 | Cheapest Flights Within K Stops | medium | |
| 804 | Rotated Digits | cpp | medium |
| 805 | Escape The Ghosts | medium | |
| 806 | Domino and Tromino Tiling | cpp | medium |
| 807 | Custom Sort String | medium | |
| 808 | Number of Matching Subsequences | medium | |
| 809 | Preimage Size of Factorial Zeroes Function | hard | |
| 810 | Valid Tic-Tac-Toe State | medium | |
| 811 | Number of Subarrays with Bounded Maximum | cpp | medium |
| 812 | Rotate String | cpp | easy |
| 813 | All Paths From Source to Target | medium | |
| 814 | Smallest Rotation with Highest Score | cpp | hard |
| 815 | Champagne Tower | medium | |
| 816 | Design HashSet | easy | |
| 817 | Design HashMap | easy | |
| 818 | Similar RGB Color | easy | |
| 819 | Minimum Swaps To Make Sequences Increasing | cpp | hard |
| 820 | Find Eventual Safe States | medium | |
| 821 | Bricks Falling When Hit | cpp | hard |
| 822 | Unique Morse Code Words | easy | |
| 823 | Split Array With Same Average | hard | |
| 824 | Number of Lines To Write String | cpp | easy |
| 825 | Max Increase to Keep City Skyline | medium | |
| 826 | Soup Servings | medium | |
| 827 | Expressive Words | medium | |
| 828 | Chalkboard XOR Game | hard | |
| 829 | Subdomain Visit Count | medium | |
| 830 | Largest Triangle Area | easy | |
| 831 | Largest Sum of Averages | medium | |
| 832 | Binary Tree Pruning | cpp | medium |
| 833 | Bus Routes | hard | |
| 834 | Ambiguous Coordinates | medium | |
| 835 | Linked List Components | medium | |
| 836 | Race Car | hard | |
| 837 | Most Common Word | easy | |
| 838 | Design Linked List | medium | |
| 839 | Short Encoding of Words | medium | |
| 841 | Shortest Distance to a Character | cpp | easy |
| 842 | Card Flipping Game | medium | |
| 843 | Binary Trees With Factors | medium | |
| 850 | Insert into a Sorted Circular Linked List | medium | |
| 851 | Goat Latin | easy | |
| 852 | Friends Of Appropriate Ages | cpp | medium |
| 853 | Most Profit Assigning Work | medium | |
| 854 | Making A Large Island | hard | |
| 855 | Count Unique Characters of All Substrings of a Given String | hard | |
| 856 | Consecutive Numbers Sum | hard | |
| 857 | Positions of Large Groups | easy | |
| 858 | Masking Personal Information | medium | |
| 859 | Design Circular Deque | medium | |
| 860 | Design Circular Queue | cpp | medium |
| 861 | Flipping an Image | easy | |
| 862 | Find And Replace in String | medium | |
| 863 | Sum of Distances in Tree | hard | |
| 864 | Image Overlap | medium | |
| 865 | Robot Room Cleaner | hard | |
| 866 | Rectangle Overlap | easy | |
| 867 | New 21 Game | cpp | medium |
| 868 | Push Dominoes | medium | |
| 869 | Similar String Groups | hard | |
| 870 | Magic Squares In Grid | medium | |
| 871 | Keys and Rooms | medium | |
| 872 | Split Array into Fibonacci Sequence | medium | |
| 873 | Guess the Word | cpp | hard |
| 874 | Backspace String Compare | easy | |
| 875 | Longest Mountain in Array | medium | |
| 876 | Hand of Straights | cpp | medium |
| 877 | Shortest Path Visiting All Nodes | cpp | hard |
| 878 | Shifting Letters | medium | |
| 879 | Maximize Distance to Closest Person | medium | |
| 880 | Rectangle Area II | hard | |
| 881 | Loud and Rich | medium | |
| 882 | Peak Index in a Mountain Array | medium | |
| 883 | Car Fleet | medium | |
| 884 | K-Similar Strings | cpp | hard |
| 885 | Exam Room | cpp | medium |
| 886 | Score of Parentheses | medium | |
| 887 | Minimum Cost to Hire K Workers | hard | |
| 888 | Mirror Reflection | medium | |
| 889 | Buddy Strings | easy | |
| 890 | Lemonade Change | easy | |
| 891 | Score After Flipping Matrix | medium | |
| 892 | Shortest Subarray with Sum at Least K | cpp | hard |
| 893 | All Nodes Distance K in Binary Tree | medium | |
| 894 | Random Pick with Blacklist | cpp | hard |
| 895 | Shortest Path to Get All Keys | hard | |
| 896 | Smallest Subtree with all the Deepest Nodes | cpp | medium |
| 897 | Prime Palindrome | cpp | medium |
| 898 | Transpose Matrix | easy | |
| 899 | Binary Gap | easy | |
| 900 | Reordered Power of 2 | medium | |
| 901 | Advantage Shuffle | medium | |
| 902 | Minimum Number of Refueling Stops | hard | |
| 903 | Implement Rand10() Using Rand7() | medium | |
| 904 | Leaf-Similar Trees | easy | |
| 905 | Length of Longest Fibonacci Subsequence | cpp | medium |
| 906 | Walking Robot Simulation | medium | |
| 907 | Koko Eating Bananas | medium | |
| 908 | Middle of the Linked List | cpp | easy |
| 909 | Stone Game | medium | |
| 910 | Nth Magical Number | hard | |
| 911 | Profitable Schemes | hard | |
| 912 | Random Pick with Weight | cpp | medium |
| 913 | Random Flip Matrix | medium | |
| 914 | Random Point in Non-overlapping Rectangles | medium | |
| 915 | Generate Random Point in a Circle | medium | |
| 916 | Decoded String at Index | medium | |
| 917 | Boats to Save People | cpp | medium |
| 918 | Reachable Nodes In Subdivided Graph | hard | |
| 919 | Projection Area of 3D Shapes | easy | |
| 920 | Uncommon Words from Two Sentences | easy | |
| 921 | Spiral Matrix III | medium | |
| 922 | Possible Bipartition | cpp | medium |
| 923 | Super Egg Drop | hard | |
| 924 | Fair Candy Swap | easy | |
| 925 | Construct Binary Tree from Preorder and Postorder Traversal | cpp | medium |
| 926 | Find and Replace Pattern | medium | |
| 927 | Sum of Subsequence Widths | hard | |
| 928 | Surface Area of 3D Shapes | easy | |
| 929 | Groups of Special-Equivalent Strings | cpp | medium |
| 930 | All Possible Full Binary Trees | medium | |
| 931 | Maximum Frequency Stack | hard | |
| 932 | Monotonic Array | easy | |
| 933 | Increasing Order Search Tree | cpp | easy |
| 934 | Bitwise ORs of Subarrays | medium | |
| 935 | Orderly Queue | hard | |
| 936 | RLE Iterator | medium | |
| 937 | Online Stock Span | medium | |
| 938 | Numbers At Most N Given Digit Set | cpp | hard |
| 939 | Valid Permutations for DI Sequence | hard | |
| 940 | Fruit Into Baskets | medium | |
| 941 | Sort Array By Parity | easy | |
| 942 | Super Palindromes | hard | |
| 943 | Sum of Subarray Minimums | medium | |
| 944 | Smallest Range I | easy | |
| 945 | Snakes and Ladders | medium | |
| 946 | Smallest Range II | medium | |
| 947 | Online Election | medium | |
| 948 | Sort an Array | medium | |
| 949 | Cat and Mouse | hard | |
| 950 | X of a Kind in a Deck of Cards | easy | |
| 951 | Partition Array into Disjoint Intervals | cpp | medium |
| 952 | Word Subsets | medium | |
| 953 | Reverse Only Letters | cpp | easy |
| 954 | Maximum Sum Circular Subarray | medium | |
| 955 | Complete Binary Tree Inserter | medium | |
| 956 | Number of Music Playlists | hard | |
| 957 | Minimum Add to Make Parentheses Valid | medium | |
| 958 | Sort Array By Parity II | easy | |
| 959 | 3Sum With Multiplicity | medium | |
| 960 | Minimize Malware Spread | hard | |
| 961 | Long Pressed Name | cpp | easy |
| 962 | Flip String to Monotone Increasing | medium | |
| 963 | Three Equal Parts | hard | |
| 964 | Minimize Malware Spread II | hard | |
| 965 | Unique Email Addresses | cpp | easy |
| 966 | Binary Subarrays With Sum | medium | |
| 967 | Minimum Falling Path Sum | medium | |
| 968 | Beautiful Array | medium | |
| 969 | Number of Recent Calls | easy | |
| 971 | Shortest Bridge | medium | |
| 972 | Knight Dialer | medium | |
| 973 | Stamping The Sequence | cpp | hard |
| 974 | Reorder Data in Log Files | medium | |
| 975 | Range Sum of BST | easy | |
| 976 | Minimum Area Rectangle | medium | |
| 977 | Distinct Subsequences II | cpp | hard |
| 978 | Valid Mountain Array | easy | |
| 979 | DI String Match | cpp | easy |
| 980 | Find the Shortest Superstring | hard | |
| 981 | Delete Columns to Make Sorted | easy | |
| 982 | Minimum Increment to Make Array Unique | medium | |
| 983 | Validate Stack Sequences | cpp | medium |
| 984 | Most Stones Removed with Same Row or Column | medium | |
| 985 | Bag of Tokens | medium | |
| 986 | Largest Time for Given Digits | cpp | medium |
| 987 | Reveal Cards In Increasing Order | medium | |
| 988 | Flip Equivalent Binary Trees | medium | |
| 989 | Largest Component Size by Common Factor | hard | |
| 990 | Verifying an Alien Dictionary | easy | |
| 991 | Array of Doubled Pairs | medium | |
| 992 | Delete Columns to Make Sorted II | medium | |
| 993 | Tallest Billboard | cpp | hard |
| 994 | Prison Cells After N Days | medium | |
| 998 | Check Completeness of a Binary Tree | medium | |
| 999 | Regions Cut By Slashes | cpp | medium |
| 1000 | Delete Columns to Make Sorted III | hard | |
| 1001 | N-Repeated Element in Size 2N Array | easy | |
| 1002 | Maximum Width Ramp | cpp | medium |
| 1003 | Minimum Area Rectangle II | medium | |
| 1004 | Least Operators to Express Number | hard | |
| 1005 | Univalued Binary Tree | easy | |
| 1006 | Vowel Spellchecker | medium | |
| 1007 | Numbers With Same Consecutive Differences | medium | |
| 1008 | Binary Tree Cameras | cpp | hard |
| 1009 | Pancake Sorting | cpp | medium |
| 1010 | Powerful Integers | medium | |
| 1011 | Flip Binary Tree To Match Preorder Traversal | medium | |
| 1012 | Equal Rational Numbers | hard | |
| 1013 | Fibonacci Number | easy | |
| 1014 | K Closest Points to Origin | medium | |
| 1016 | Subarray Sums Divisible by K | medium | |
| 1017 | Odd Even Jump | hard | |
| 1018 | Largest Perimeter Triangle | easy | |
| 1019 | Squares of a Sorted Array | easy | |
| 1020 | Longest Turbulent Subarray | medium | |
| 1021 | Distribute Coins in Binary Tree | cpp | medium |
| 1022 | Unique Paths III | cpp | hard |
| 1023 | Time Based Key-Value Store | medium | |
| 1024 | Triples with Bitwise AND Equal To Zero | hard | |
| 1025 | Minimum Cost For Tickets | cpp | medium |
| 1026 | String Without AAA or BBB | cpp | medium |
| 1027 | Sum of Even Numbers After Queries | medium | |
| 1028 | Interval List Intersections | medium | |
| 1029 | Vertical Order Traversal of a Binary Tree | cpp | hard |
| 1030 | Smallest String Starting From Leaf | cpp | medium |
| 1031 | Add to Array-Form of Integer | easy | |
| 1032 | Satisfiability of Equality Equations | medium | |
| 1033 | Broken Calculator | medium | |
| 1034 | Subarrays with K Different Integers | hard | |
| 1035 | Cousins in Binary Tree | easy | |
| 1036 | Rotting Oranges | medium | |
| 1037 | Minimum Number of K Consecutive Bit Flips | hard | |
| 1038 | Number of Squareful Arrays | cpp | hard |
| 1039 | Find the Town Judge | easy | |
| 1040 | Maximum Binary Tree II | medium | |
| 1041 | Available Captures for Rook | easy | |
| 1042 | Minimum Cost to Merge Stones | hard | |
| 1043 | Grid Illumination | hard | |
| 1044 | Find Common Characters | easy | |
| 1045 | Check If Word Is Valid After Substitutions | medium | |
| 1046 | Max Consecutive Ones III | cpp | medium |
| 1047 | Maximize Sum Of Array After K Negations | cpp | easy |