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Well-structured Leetcode Problem Solutions (JavaScript)

JavaScript Leetcode License

Optimized solutions for Leetcode algorithmic problems.

Table of| S.No | Ti| S.No | Title | Difficulty |

| ---- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ------------------------------------------------------ | | 1 | Two Sum | Easy | | 2 | Add Two Numbers | Medium | | 3 | Longest Substring Without Repeating Characters | Medium | | 4 | Median Of Two Sorted Arrays | Hard | | 5 | Longest Palindromic Substring | Medium | | 6 | Zigzag Conversion | Medium | | 7 | Reverse Integer | Medium | | 8 | String to Integer Atoi | Medium | | 9 | Palindrome Number | Easy | | 10 | Regular Expression Matching | Hard | | 11 | Container With Most Water | Medium | | 12 | Integer To Roman | Medium | | 13 | Roman To Integer | Easy | | 14 | Longest Common Prefix | Easy | | 15 | 3sum | Medium | | 16 | 3sum Closest | Medium | | 17 | Letter Combinations Of A Phone Number | Medium | | 18 | 4sum | Medium | | 19 | Remove Nth Node From End Of List | Medium | | 20 | Valid Parentheses | Easy | | 21 | Merge Two Sorted Lists | Easy | | 22 | Generate Parentheses | Medium | | 23 | Merge K Sorted Lists | Hard | | 24 | Swap Nodes In Pairs | Medium | | 25 | Reverse Nodes In K Group | Hard | | 26 | Remove Duplicates From Sorted Array | Easy | | 27 | Remove Element | Easy | | 28 | Find the Index of the First Occurrence in a String | Easy | | 29 | Divide Two Integers | Medium | | 30 | Substring With Concatenation Of All Words | Hard | | 31 | Next Permutation | Medium | | 32 | Longest Valid Parentheses | Hard | | 33 | Search In Rotated Sorted Array | Medium | | 34 | Find First And Last Position Of Element In Sorted Array | Medium | | 35 | Search Insert Position | Easy | | 36 | Valid Sudoku | Medium | | 37 | Sudoku Solver | Hard | | 38 | Count And Say | Medium | | 39 | Combination Sum | Medium | | 40 | Combination Sum II | Medium | | 41 | First Missing Positive | Hard | | 42 | Trapping Rain Water | Hard | | 43 | Multiply Strings | Medium | | 44 | Wildcard Matching | Hard | | 45 | Jump Game II | Medium | | 46 | Permutations | Medium | | 47 | Permutations II | Medium | | 48 | Rotate Image | Medium | | 49 | Group Anagrams | Medium | | 50 | Powx N | Medium | | 51 | N Queens | Hard | | 52 | N Queens II | Hard | | 53 | Maximum Subarray | Easy | | 54 | Spiral Matrix | Medium | | 55 | Jump Game | Medium | | 56 | Merge Intervals | Medium | | 57 | Insert Interval | Medium | | 58 | Length Of Last Word | Easy | | 59 | Spiral Matrix II | Medium | | 60 | Permutation Sequence | Hard | | 61 | Rotate List | Medium | | 62 | Unique Paths | Medium | | 63 | Unique Paths II | Medium | | 64 | Minimum Path Sum | Medium | | 65 | Valid Number | Hard | | 66 | Plus One | Easy | | 67 | Add Binary | Easy | | 68 | Text Justification | Hard | | 69 | Sqrtx | Medium | | 70 | Climbing Stairs | Easy | | 71 | Simplify Path | Medium | | 72 | Edit Distance | Medium | | 73 | Set Matrix Zeroes | Medium | | 74 | Search A 2d Matrix | Medium | | 75 | Sort Colors | Medium | | 76 | Minimum Window Substring | Hard | | 77 | Combinations | Medium | | 78 | Subsets | Medium | | 79 | Word Search | Medium | | 80 | Remove Duplicates From Sorted Array II | Medium | | 81 | Search In Rotated Sorted Array II | Medium | | 82 | Remove Duplicates From Sorted List II | Medium | | 83 | Remove Duplicates From Sorted List | Easy | | 84 | Largest Rectangle In Histogram | Hard | | 85 | Maximal Rectangle | Hard | | 86 | Partition List | Medium | | 87 | Scramble String | Hard | | 88 | Merge Sorted Array | Easy | | 89 | Gray Code | Medium | | 90 | Subsets II | Medium | | 91 | Decode Ways | Medium | | 92 | Reverse Linked List II | Medium | | 93 | Restore Ip Addresses | Medium | | 94 | Binary Tree Inorder Traversal | Easy | | 95 | Unique Binary Search Trees II | Medium | | 96 | Unique Binary Search Trees | Medium | | 97 | Interleaving String | Medium | | 98 | Validate Binary Search Tree | Medium | | 99 | Recover Binary Search Tree | Medium | | 100 | Same Tree | Easy | | 101 | Symmetric Tree | Easy | | 102 | Binary Tree Level Order Traversal | Medium | | 103 | Binary Tree Zigzag Level Order Traversal | Medium | | 104 | Maximum Depth Of Binary Tree | Easy | | 105 | Construct Binary Tree From Preorder And Inorder Traversal | Medium | | 106 | Construct Binary Tree From Inorder And Postorder Traversal | Medium | | 107 | Binary Tree Level Order Traversal II | Medium | | 108 | Convert Sorted Array To Binary Search Tree | Easy | | 109 | Convert Sorted List To Binary Search Tree | Medium | | 110 | Balanced Binary Tree | Easy | | 111 | Minimum Depth Of Binary Tree | Easy | | 112 | Path Sum | Easy | | 113 | Path Sum II | Medium | | 114 | Flatten Binary Tree To Linked List | Medium | | 115 | Distinct Subsequences | Hard | | 116 | Populating Next Right Pointers In Each Node | Medium | | 117 | Populating Next Right Pointers In Each Node II | Medium | | 118 | Pascals Triangle | Easy | | 119 | Pascals Triangle II | Easy | | 120 | Triangle | Medium | | 121 | Best Time To Buy And Sell Stock | Easy | | 122 | Best Time To Buy And Sell Stock II | Medium | | 123 | Best Time To Buy And Sell Stock III | Hard | | 124 | Binary Tree Maximum Path Sum | Hard | | 125 | Valid Palindrome | Easy | | 126 | Word Ladder II | Hard | | 127 | Word Ladder | Hard | | 128 | Longest Consecutive Sequence | Medium | | 129 | Sum Root To Leaf Numbers | Medium | | 130 | Surrounded Regions | Medium | | 131 | Palindrome Partitioning | Medium | | 132 | Palindrome Partitioning II | Hard | | 133 | Clone Graph | Medium | | 134 | Gas Station | Medium | | 135 | Candy | Hard | | 136 | Single Number | Easy | | 137 | Single Number II | Medium | | 138 | Copy List With Random Pointer | Medium | | 139 | Word Break | Medium | | 140 | Word Break II | Hard | | 141 | Linked List Cycle | Easy | | 142 | Linked List Cycle II | Medium | | 143 | Reorder List | Medium | | 144 | Binary Tree Preorder Traversal | Easy | | 145 | Binary Tree Postorder Traversal | Easy | | 146 | Lru Cache | Medium | | 147 | Insertion Sort List | Medium | | 148 | Sort List | Medium | | 149 | Max Points On A Line | Hard | | 150 | Evaluate Reverse Polish Notation | Medium | | 151 | Reverse Words In A String | Medium | | 152 | Maximum Product Subarray | Medium | | 153 | Find Minimum In Rotated Sorted Array | Medium | | 154 | Find Minimum In Rotated Sorted Array II | Hard | | 155 | Min Stack | Medium | | 156 | Binary Tree Upside Down | Medium | | 157 | Read N Characters Given Read 4 | Easy | | 158 | Read N Characters Given Read 4 II Call Multiple Times | Hard | | 159 | Longest Substring With At Most Two Distinct Characters | Medium | | 160 | Intersection Of Two Linked Lists | Medium | | 161 | One Edit Distance | Medium | | 162 | Find Peak Element | Medium | | 163 | Missing Ranges | Easy | | 164 | Maximum Gap | Medium | | 165 | Compare Version Numbers | Medium | | 166 | Fraction To Recurring Decimal | Medium | | 167 | Two Sum II Input Array Is Sorted | Easy | | 168 | Excel Sheet Column Title | Easy | | 169 | Majority Element | Easy | | 170 | Two Sum III Data Structure Design | Easy | | 171 | Excel Sheet Column Number | Easy | | 172 | Factorial Trailing Zeroes | Medium | | 173 | Binary Search Tree Iterator | Medium | | 174 | Dungeon Game | Hard | | 175 | Combine Two Tables | Easy | | 176 | Second Highest Salary | Easy | | 177 | Nth Highest Salary | Medium | | 178 | Rank Scores | Medium | | 179 | Largest Number | Medium | | 180 | Consecutive Numbers Sum | Medium | | 181 | Employees Earning More Than Their Managers | Easy | | 182 | Duplicate Emails | Easy | | 183 | Customers Who Never Order | Easy | | 184 | Department Highest Salary | Medium | | 185 | Department Top Three Salaries | Medium | | 186 | Reverse Words In A String II | Medium | | 187 | Repeated Dna Sequences | Medium | | 188 | Best Time To Buy And Sell Stock Iv | Hard | | 189 | Rotate Array | Medium | | 190 | Reverse Bits | Easy | | 191 | Number Of 1 Bits | Easy | | 192 | Word Frequency | Easy | | 193 | Valid Phone Numbers | Easy | | 194 | Transpose File | Easy | | 195 | Tenth Line | Easy | | 196 | Delete Duplicate Emails | Easy | | 197 | Rising Temperature | Easy | | 198 | House Robber | Medium | | 199 | Binary Tree Right Side View | Medium | | 200 | Number Of Islands | Medium | | 201 | Bitwise And Of Numbers Range | Medium | | 202 | Happy Number | Easy | | 203 | Remove Linked List Elements | Easy | | 204 | Count Primes | Medium | | 205 | Isomorphic Strings | Easy | | 206 | Reverse Linked List | Easy | | 207 | Course Schedule | Medium | | 208 | Implement Trie Prefix Tree | Medium | | 209 | Minimum Size Subarray Sum | Medium | | 210 | Course Schedule II | Medium | | 211 | Design Add And Search Words Data Structure | Medium | | 212 | Word Search II | Hard | | 213 | House Robber II | Medium | | 214 | Shortest Palindrome | Hard | | 215 | Kth Largest Element In An Array | Medium | | 216 | Combination Sum III | Medium | | 217 | Contains Duplicate | Easy | | 218 | The Skyline Problem | Hard | | 219 | Contains Duplicate II | Easy | | 220 | Contains Duplicate III | Hard | | 221 | Maximal Square | Medium | | 222 | Count Complete Tree Nodes | Easy | | 223 | Rectangle Area | Medium | | 224 | Basic Calculator | Hard | | 225 | Implement Stack Using Queues | Easy | | 226 | Invert Binary Tree | Easy | | 227 | Basic Calculator II | Medium | | 228 | Summary Ranges | Easy | | 229 | Majority Element II | Medium | | 230 | Kth Smallest Element In A Bst | Medium | | 231 | Power Of Two | Easy | | 232 | Implement Queue Using Stacks | Easy | | 233 | Number Of Digit One | Hard | | 234 | Palindrome Linked List | Easy | | 235 | Lowest Common Ancestor Of A Binary Search Tree | Easy | | 236 | Lowest Common Ancestor Of A Binary Tree | Medium | | 237 | Delete Node In A Linked List | Easy | | 238 | Product Of Array Except Self | Medium | | 239 | Sliding Window Maximum | Hard | | 240 | Search A 2d Matrix II | Medium | | 241 | Different Ways To Add Parentheses | Medium | | 242 | Valid Anagram | 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 | Easy | | 258 | Add Digits | Easy | | 259 | 3sum Smaller | Medium | | 260 | Single Number III | Medium | | 261 | Graph Valid Tree | Medium | | 262 | Trips and Users | Hard | | 263 | Ugly Number | Easy | | 264 | Ugly Number II | Medium | | 265 | Paint House II | Hard | | 266 | Palindrome Permutation | Easy | | 267 | Palindrome Permutation II | Medium | | 268 | Missing Number | 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 | Medium | | 275 | H Index II | Medium | | 276 | Paint Fence | Medium | | 277 | Find The Celebrity | Medium | | 278 | First Bad Version | Medium | | 279 | Perfect Squares | Medium | | 280 | Wiggle Sort | Medium | | 281 | Zigzag Iterator | Medium | | 282 | Expression Add Operators | Hard | | 283 | Move Zeroes | Easy | | 284 | Peeking Iterator | Medium | | 285 | Inorder Successor In Bst | Medium | | 286 | Walls And Gates | Medium | | 287 | Find The Duplicate Number | Medium | | 288 | Unique Word Abbreviation | Medium | | 289 | Game Of Life | Medium | | 290 | Word Pattern | Easy | | 291 | Word Pattern II | Medium | | 292 | Nim Game | Easy | | 293 | Flip Game | Easy | | 294 | Flip Game II | Medium | | 295 | Find Median From Data Stream | Hard | | 296 | Best Meeting Point | Hard | | 297 | Serialize And Deserialize Binary Tree | Hard | | 298 | Binary Tree Longest Consecutive Sequence | Medium | | 299 | Bulls And Cows | Medium | | 300 | Longest Increasing Subsequence | Medium | | 301 | Remove Invalid Parentheses | Hard | | 302 | Smallest Rectangle Enclosing Black Pixels | Hard | | 303 | Range Sum Query Immutable | Easy | | 304 | Range Sum Query 2d Immutable | Medium | | 305 | Number Of Islands II | Hard | | 306 | Additive Number | Medium | | 307 | Range Sum Query Mutable | 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 | Medium | | 314 | Binary Tree Vertical Order Traversal | Medium | | 315 | Count Of Smaller Numbers After Self | Hard | | 316 | Remove Duplicate Letters | Medium | | 317 | Shortest Distance From All Buildings | Hard | | 318 | Maximum Product Of Word Lengths | Medium | | 319 | Bulb Switcher | Medium | | 320 | Generalized Abbreviation | Medium | | 321 | Create Maximum Number | Hard | | 322 | Coin Change | Medium | | 323 | Number Of Connected Components In An Undirected Graph | Medium | | 324 | Wiggle Sort II | Medium | | 325 | Maximum Size Subarray Sum Equals K | Medium | | 326 | Power Of Three | Easy | | 327 | Count Of Range Sum | Hard | | 328 | Odd Even Linked List | Medium | | 329 | Longest Increasing Path In A Matrix | Hard | | 330 | Patching Array | Hard | | 331 | Verify Preorder Serialization Of A Binary Tree | Medium | | 332 | Reconstruct Itinerary | Hard | | 333 | Largest Bst Subtree | Medium | | 334 | Increasing Triplet Subsequence | Medium | | 335 | Self Crossing | Hard | | 336 | Palindrome Pairs | Hard | | 337 | House Robber III | Medium | | 338 | Counting Bits | 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 | Easy | | 343 | Integer Break | Medium | | 344 | Reverse String | Easy | | 345 | Reverse Vowels Of A String | Easy | | 346 | Moving Average From Data Stream | Easy | | 347 | Top K Frequent Elements | Medium | | 348 | Design Tic Tac Toe | Medium | | 349 | Intersection Of Two Arrays | Easy | | 350 | Intersection Of Two Arrays II | 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 | Medium | | 356 | Line Reflection | Medium | | 357 | Count Numbers With Unique Digits | 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 | Medium | | 366 | Find Leaves Of Binary Tree | Medium | | 367 | Valid Perfect Square | Easy | | 368 | Largest Divisible Subset | Medium | | 369 | Plus One Linked List | Medium | | 370 | Range Addition | Medium | | 371 | Sum Of Two Integers | Medium | | 372 | Super Pow | Medium | | 373 | Find K Pairs With Smallest Sums | Medium | | 374 | Guess Number Higher Or Lower | Medium | | 375 | Guess Number Higher Or Lower II | Medium | | 376 | Wiggle Subsequence | Medium | | 377 | Combination Sum Iv | Medium | | 378 | Kth Smallest Element In A Sorted Matrix | Medium | | 379 | Design Phone Directory | Medium | | 380 | Insert Delete Getrandom O1 | Medium | | 381 | Insert Delete Getrandom O1 Duplicates Allowed | Hard | | 382 | Linked List Random Node | Medium | | 383 | Ransom Note | Easy | | 384 | Shuffle An Array | Medium | | 385 | Mini Parser | Medium | | 386 | Lexicographical Numbers | Medium | | 387 | First Unique Character In A String | Easy | | 388 | Longest Absolute File Path | Medium | | 389 | Find The Difference | Easy | | 390 | Elimination Game | Medium | | 391 | Perfect Rectangle | Hard | | 392 | Is Subsequence | Easy | | 393 | Utf 8 Validation | Medium | | 394 | Decode String | Medium | | 395 | Longest Substring With At Least K Repeating Characters | Medium | | 396 | Rotate Function | Medium | | 397 | Integer Replacement | Medium | | 398 | Random Pick Index | Medium | | 399 | Evaluate Division | Medium | | 400 | Nth Digit | Medium | | 401 | Binary Watch | Easy | | 402 | Remove K Digits | Medium | | 403 | Frog Jump | Hard | | 404 | Sum Of Left Leaves | Easy | | 405 | Convert A Number To Hexadecimal | Easy | | 406 | Queue Reconstruction By Height | Medium | | 407 | Trapping Rain Water II | Hard | | 408 | Valid Word Abbreviation | Easy | | 409 | Longest Palindrome | Easy | | 410 | Split Array Largest Sum | Hard | | 411 | Minimum Unique Word Abbreviation | Hard | | 412 | Fizz Buzz | Easy | | 413 | Arithmetic Slices | Medium | | 414 | Third Maximum Number | Easy | | 415 | Add Strings | Easy | | 416 | Partition Equal Subset Sum | Medium | | 417 | Pacific Atlantic Water Flow | Medium | | 418 | Sentence Screen Fitting | Medium | | 419 | Battleships In A Board | Medium | | 420 | Strong Password Checker | Hard | | 421 | Maximum Xor Of Two Numbers In An Array | Medium | | 422 | Valid Word Square | Easy | | 423 | Reconstruct Original Digits From English | Medium | | 424 | Longest Repeating Character Replacement | Medium | | 425 | Word Squares | Hard | | 426 | Convert Binary Search Tree To Sorted Doubly Linked List | Medium | | 427 | Construct Quad Tree | Medium | | 428 | Serialize And Deserialize N Ary Tree | Hard | | 429 | N Ary Tree Level Order Traversal | Medium | | 430 | Flatten A Multilevel Doubly Linked List | Medium | | 431 | Encode N Ary Tree To Binary Tree | Hard | | 432 | All Oone Data Structure | Hard | | 433 | Minimum Genetic Mutation | Medium | | 434 | Number Of Segments In A String | Easy | | 435 | Non Overlapping Intervals | Medium | | 436 | Find Right Interval | Medium | | 437 | Path Sum III | Medium | | 438 | Find All Anagrams In A String | Medium | | 439 | Ternary Expression Parser | Medium | | 440 | K Th Smallest In Lexicographical Order | Hard | | 441 | Arranging Coins | Easy | | 442 | Find All Duplicates In An Array | Medium | | 443 | String Compression | Medium | | 444 | Sequence Reconstruction | Medium | | 445 | Add Two Numbers II | Medium | | 446 | Arithmetic Slices II Subsequence | Hard | | 447 | Number Of Boomerangs | Medium | | 448 | Find All Numbers Disappeared In An Array | Easy | | 449 | Serialize And Deserialize Bst | Medium | | 450 | Delete Node In A Bst | Medium | | 451 | Sort Characters By Frequency | Medium | | 452 | Minimum Number Of Arrows To Burst Balloons | Medium | | 453 | Minimum Moves To Equal Array Elements | Medium | | 454 | 4sum II | Medium | | 455 | Assign Cookies | Easy | | 456 | 132 Pattern | Medium | | 457 | Circular Array Loop | Medium | | 458 | Poor Pigs | Hard | | 459 | Repeated Substring Pattern | Easy | | 460 | Lfu Cache | Hard | | 461 | Hamming Distance | Easy | | 462 | Minimum Moves To Equal Array Elements II | Medium | | 463 | Island Perimeter | Medium | | 464 | Can I Win | 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 | | 470 | Implement Rand10 Using Rand7 | Medium | | 471 | Encode String With Shortest Length | Hard | | 472 | Concatenated Words | Hard | | 473 | Matchsticks To Square | Medium | | 474 | Ones And Zeroes | Medium | | 475 | Heaters | Medium | | 476 | Number Complement | Easy | | 477 | Total Hamming Distance | Medium | | 478 | Generate Random Point In A Circle | Medium | | 479 | Largest Palindrome Product | Hard | | 480 | Sliding Window Median | Hard | | 481 | Magical String | Medium | | 482 | License Key Formatting | Easy | | 483 | Smallest Good Base | Hard | | 484 | Find Permutation | Medium | | 485 | Max Consecutive Ones | Easy | | 486 | Predict The Winner | Medium | | 487 | Max Consecutive Ones II | Medium | | 488 | Zuma Game | Hard | | 489 | Robot Room Cleaner | Hard | | 490 | The Maze | Medium | | 491 | Non Decreasing Subsequences | Medium | | 492 | Construct The Rectangle | Easy | | 493 | Reverse Pairs | Hard | | 494 | Target Sum | Medium | | 495 | Teemo Attacking | Easy | | 496 | Next Greater Element I | Easy | | 497 | Random Point In Non Overlapping Rectangles | Medium | | 498 | Diagonal Traverse | Medium | | 499 | The Maze III | Hard | | 500 | Keyboard Row | Easy | | 501 | Find Mode In Binary Search Tree | Easy | | 502 | Ipo | Hard | | 503 | Next Greater Element II | Medium | | 504 | Base 7 | Easy | | 505 | The Maze II | Medium | | 506 | Relative Ranks | Easy | | 507 | Perfect Number | Easy | | 508 | Most Frequent Subtree Sum | Medium | | 509 | Fibonacci Number | Easy | | 510 | Inorder Successor In Bst II | Medium | | 511 | Game Play Analysis I | Easy | | 512 | Game Play Analysis II | Medium | | 513 | Find Bottom Left Tree Value | Medium | | 514 | Freedom Trail | Hard | | 515 | Find Largest Value In Each Tree Row | Medium | | 516 | Longest Palindromic Subsequence | Medium | | 517 | Super Washing Machines | Hard | | 518 | Coin Change II | Medium | | 519 | Random Flip Matrix | Medium | | 520 | Detect Capital | Easy | | 521 | Longest Uncommon Subsequence I | Easy | | 522 | Longest Uncommon Subsequence II | Medium | | 523 | Continuous Subarray Sum | Medium | | 524 | Longest Word In Dictionary Through Deleting | Medium | | 525 | Contiguous Array | Medium | | 526 | Beautiful Arrangement | Medium | | 527 | Word Abbreviation | Hard | | 528 | Random Pick With Weight | Medium | | 529 | Minesweeper | Medium | | 530 | Minimum Absolute Difference In Bst | Easy | | 531 | Lonely Pixel I | Medium | | 532 | K Diff Pairs In An Array | Medium | | 533 | Lonely Pixel II | Medium | | 534 | Game Play Analysis III | Medium | | 535 | Encode And Decode Tinyurl | Medium | | 536 | Construct Binary Tree From String | Medium | | 537 | Complex Number Multiplication | Medium | | 538 | Convert Bst To Greater Tree | Medium | | 539 | Minimum Time Difference | Medium | | 540 | Single Element In A Sorted Array | Medium | | 541 | Reverse String II | Easy | | 542 | 01 Matrix | Medium | | 543 | Diameter Of Binary Tree | Easy | | 544 | Output Contest Matches | Medium | | 545 | Boundary Of Binary Tree | Medium | | 546 | Remove Boxes | Hard | | 547 | Number Of Provinces | Medium | | 548 | Split Array With Equal Sum | Hard | | 549 | Binary Tree Longest Consecutive Sequence II | Medium | | 550 | Game Play Analysis IV | Medium | | 551 | Student Attendance Record I | Easy | | 552 | Student Attendance Record II | Hard | | 553 | Optimal Division | Medium | | 554 | Brick Wall | Medium | | 555 | Split Concatenated Strings | Medium | | 556 | Next Greater Element III | Medium | | 557 | Reverse Words In A String III | Easy | | 558 | Logical Or Of Two Binary Grids Represented As Quad Trees | Medium | | 559 | Maximum Depth Of N Ary Tree | Easy | | 560 | Subarray Sum Equals K | Medium | | 561 | Array Partition | Easy | | 562 | Longest Line Of Consecutive One In Matrix | Medium | | 563 | Binary Tree Tilt | Easy | | 564 | Find The Closest Palindrome | Hard | | 565 | Array Nesting | Medium | | 566 | Reshape The Matrix | Easy | | 567 | Permutation In String | 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 | Easy | | 573 | Squirrel Simulation | Medium | | 574 | Winning Candidate | Medium | | 575 | Distribute Candies | 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 | Medium | | 582 | Kill Process | Medium | | 583 | Delete Operation For Two Strings | 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 | | 589 | N Ary Tree Preorder Traversal | Easy | | 590 | N Ary Tree Postorder Traversal | Easy | | 591 | Tag Validator | Hard | | 592 | Fraction Addition And Subtraction | Medium | | 593 | Valid Square | Medium | | 594 | Longest Harmonious Subsequence | Easy | | 595 | Big Countries | Easy | | 596 | Classes With at Least 5 Students | Easy | | 597 | Friend Requests I Overall Acceptance Rate | Easy | | 598 | Range Addition II | Easy | | 599 | Minimum Index Sum Of Two Lists | Easy | | 600 | Non Negative Integers Without Consecutive Ones | Hard | | 601 | Human Traffic of Stadium | Hard | | 602 | Friend Requests II - Who has the Most Friend | Medium | | 603 | Consecutive Available Seats | Easy | | 604 | Design Compressed String Iterator | Easy | | 605 | Can Place Flowers | Easy | | 606 | Construct String From Binary Tree | Easy | | 607 | Sales Person | Easy | | 608 | Tree Node | Medium | | 609 | Find Duplicate File In System | 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 | Easy | | 618 | Students Report by Geography | Hard | | 619 | Biggest Single Number | Easy | | 620 | Not Boring Movies | Easy | | 621 | Task Scheduler | Medium | | 622 | Design Circular Queue | Medium | | 623 | Add One Row To Tree | Medium | | 624 | Maximum Distance In Arrays | Medium | | 625 | Minimum Factorization | Medium | | 626 | Exchange Seats | Medium | | 627 | Swap Sex of Employees | Easy | | 628 | Maximum Product Of Three Numbers | 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 | Medium | | 634 | Find The Derangement Of An Array | Medium | | 635 | Design Log Storage System | Medium | | 636 | Exclusive Time Of Functions | Medium | | 637 | Average Of Levels In Binary Tree | Easy | | 638 | Shopping Offers | Medium | | 639 | Decode Ways II | Hard | | 640 | Solve The Equation | Medium | | 641 | Design Circular Deque | Medium | | 642 | Design Search Autocomplete System | Hard | | 643 | Maximum Average Subarray I | Easy | | 644 | Maximum Average Subarray II | Hard | | 645 | Set Mismatch | Medium | | 646 | Maximum Length Of Pair Chain | Medium | | 647 | Palindromic Substrings | Medium | | 649 | Dota2 Senate | Medium | | 648 | Replace Words | Medium | | 650 | 2 Keys Keyboard | Medium | | 652 | Find Duplicate Subtrees | Medium | | 651 | 4 Keys Keyboard | Medium | | 653 | Two Sum Iv Input Is A Bst | Easy | | 654 | Maximum Binary Tree | Medium | | 655 | Print Binary Tree | Medium | | 656 | Coin Path | Hard | | 657 | Robot Return To Origin | Easy | | 658 | Find K Closest Elements | Medium | | 659 | Split Array Into Consecutive Subsequences | Medium | | 660 | Remove 9 | Hard | | 661 | Image Smoother | Easy | | 662 | Maximum Width Of Binary Tree | Medium | | 663 | Equal Tree Partition | Medium | | 664 | Strange Printer | Hard | | 665 | Non Decreasing Array | 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 | Medium | | 670 | Maximum Swap | Medium | | 671 | Second Minimum Node In A Binary Tree | Easy | | 672 | Bulb Switcher II | Medium | | 673 | Number Of Longest Increasing Subsequence | Medium | | 674 | Longest Continuous Increasing Subsequence | Easy | | 675 | Cut Off Trees For Golf Event | Hard | | 676 | Implement Magic Dictionary | Medium | | 677 | Map Sum Pairs | Medium | | 678 | Valid Parenthesis String | Medium | | 679 | 24 Game | Hard | | 680 | Valid Palindrome II | Easy | | 681 | Next Closest Time | Medium | | 682 | Baseball Game | Easy | | 683 | K Empty Slots | Hard | | 684 | Redundant Connection | Medium | | 685 | Redundant Connection II | Hard | | 686 | Repeated String Match | Easy | | 687 | Longest Univalue Path | Medium | | 688 | Knight Probability In Chessboard | Medium | | 689 | Maximum Sum Of 3 Non Overlapping Subarrays | Hard | | 690 | Employee Importance | Medium | | 691 | Stickers To Spell Word | Hard | | 692 | Top K Frequent Words | Medium | | 693 | Binary Number With Alternating Bits | Easy | | 694 | Number Of Distinct Islands | Medium | | 695 | Max Area Of Island | Medium | | 696 | Count Binary Substrings | Easy | | 697 | Degree Of An Array | Easy | | 698 | Partition To K Equal Sum Subsets | Medium | | 699 | Falling Squares | Hard | | 700 | Search In A Binary Search Tree | Easy | | 701 | Insert Into A Binary Search Tree | Medium | | 702 | Search In A Sorted Array Of Unknown Size | Medium | | 703 | Kth Largest Element In A Stream | Easy | | 704 | Binary Search | Easy | | 705 | Design Hashset | Easy | | 706 | Design Hashmap | Easy | | 707 | Design Linked List | Medium | | 708 | Insert Into A Sorted Circular Linked List | Medium | | 709 | To Lower Case | Easy | | 710 | Random Pick With Blacklist | Hard | | 711 | Number Of Distinct Islands II | ![Hard](https://img.shields.io/badge/-Har d-red) | | 712 | Minimum Ascii Delete Sum For Two Strings | 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 | Easy | | 718 | Maximum Length Of Repeated Subarray | Medium | | 719 | Find K Th Smallest Pair Distance | Hard | | 720 | Longest Word In Dictionary | Medium | | 721 | Accounts Merge | Medium | | 722 | Remove Comments | Medium | | 723 | Candy Crush | Medium | | 724 | Find Pivot Index | Easy | | 725 | Split Linked List In Parts | Medium | | 726 | Number Of Atoms | Hard | | 727 | Minimum Window Subsequence | Hard | | 728 | Self Dividing Numbers | 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 | Easy | | 734 | Sentence Similarity | Easy | | 735 | Asteroid Collision | Medium | | 736 | Parse Lisp Expression | Hard | | 737 | Sentence Similarity II | Medium | | 738 | Monotone Increasing Digits | Medium | | 739 | Daily Temperatures | Medium | | 740 | Delete And Earn | Medium | | 741 | Cherry Pickup | Hard | | 742 | Closest Leaf In A Binary Tree | Medium | | 743 | Network Delay Time | Medium | | 744 | Find Smallest Letter Greater Than Target | Easy | | 745 | Prefix And Suffix Search | Hard | | 746 | Min Cost Climbing Stairs | Easy | | 747 | Largest Number At Least Twice Of Others | Easy | | 748 | Shortest Completing Word | Easy | | 749 | Contain Virus | Hard | | 750 | Number Of Corner Rectangles | Medium | | 751 | Ip To Cidr | Medium | | 752 | Open The Lock | Medium | | 753 | Cracking The Safe | Hard | | 754 | Reach A Number | Medium | | 755 | Pour Water | Medium | | 756 | Pyramid Transition Matrix | Medium | | 757 | Set Intersection Size At Least Two | Hard | | 758 | Bold Words In String | Medium | | 759 | Employee Free Time | Hard | | 760 | Find Anagram Mappings | Easy | | 761 | Special Binary String | Hard | | 762 | Prime Number of Set Bits in Binary Representation | Easy | | 763 | Partition Labels | Medium | | 764 | Largest Plus Sign | Medium | | 765 | Couples Holding Hands | Hard | | 766 | Toeplitz Matrix | Easy | | 767 | Reorganize String | Medium | | 768 | Max Chunks To Make Sorted II | Hard | | 769 | Max Chunks To Make Sorted | Medium | | 770 | Basic Calculator Iv | Hard | | 771 | Jewels And Stones | Easy | | 772 | Basic Calculator III | Hard | | 773 | Sliding Puzzle | Hard | | 774 | Minimize Max Distance To Gas Station | Hard | | 775 | Global And Local Inversions | Medium | | 776 | Split Bst | Medium | | 777 | Swap Adjacent In Lr String | Medium | | 778 | Swim In Rising Water | Hard | | 779 | K Th Symbol In Grammar | Medium | | 780 | Reaching Points | Hard | | 781 | Rabbits In Forest | Medium | | 782 | Transform To Chessboard | Hard | | 783 | Minimum Distance Between Bst Nodes | Easy | | 784 | Letter Case Permutation | Medium | | 785 | Is Graph Bipartite | Medium | | 786 | K Th Smallest Prime Fraction | Medium | | 787 | Cheapest Flights Within K Stops | Medium | | 788 | Rotated Digits | Medium | | 789 | Escape The Ghosts | Medium | | 790 | Domino And Tromino Tiling | Medium | | 791 | Custom Sort String | Medium | | 792 | Number Of Matching Subsequences | Medium | | 793 | Preimage Size Of Factorial Zeroes Function | Hard | | 794 | Valid Tic Tac Toe State | Medium | | 795 | Number Of Subarrays With Bounded Maximum | Medium | | 796 | Rotate String | Easy | | 797 | All Paths From Source To Target | Medium | | 798 | Smallest Rotation With Highest Score | Hard | | 799 | Champagne Tower | Medium | | 800 | Similar Rgb Color | Easy | | 801 | Minimum Swaps To Make Sequences Increasing | Hard | | 802 | Find Eventual Safe States | Medium | | 803 | Bricks Falling When Hit | Hard | | 804 | Unique Morse Code Words | Easy | | 805 | Split Array With Same Average | Hard | | 806 | Number Of Lines To Write String | Easy | | 807 | Max Increase To Keep City Skyline | Medium | | 808 | Soup Servings | Medium | | 809 | Expressive Words | Medium | | 810 | Chalkboard Xor Game | Hard | | 811 | Subdomain Visit Count | Medium | | 812 | Largest Triangle Area | Easy | | 813 | Largest Sum Of Averages | Medium | | 814 | Binary Tree Pruning | Medium | | 815 | Bus Routes | Hard | | 816 | Ambiguous Coordinates | Medium | | 817 | Linked List Components | Medium | | 818 | Race Car | Hard | | 819 | Most Common Word | Easy | | 820 | Short Encoding Of Words | Medium | | 821 | Shortest Distance To A Character | Easy | | 822 | Card Flipping Game | Medium | | 823 | Binary Trees With Factors | Medium | | 824 | Goat Latin | Easy | | 825 | Friends Of Appropriate Ages | Medium | | 826 | Most Profit Assigning Work | Medium | | 827 | Making A Large Island | Hard | | 828 | Count Unique Characters Of All Substrings Of A Given String | Hard | | 829 | Consecutive Numbers Sum | Hard | | 830 | Positions Of Large Groups | Easy | | 831 | Masking Personal Information | Medium | | 832 | Flipping An Image | Easy | | 833 | Find And Replace In String | Medium | | 834 | Sum Of Distances In Tree | Hard | | 835 | Image Overlap | Medium | | 836 | Rectangle Overlap | Easy | | 837 | New 21 Game | Medium | | 838 | Push Dominoes | Medium | | 839 | Similar String Groups | Hard | | 840 | Magic Squares In Grid | Medium | | 841 | Keys And Rooms | Medium | | 842 | Split Array Into Fibonacci Sequence | Medium | | 843 | Guess The Word | Hard | | 844 | Backspace String Compare | Easy | | 845 | Longest Mountain In Array | Medium | | 846 | Hand Of Straights | Medium | | 847 | Shortest Path Visiting All Nodes | Hard | | 848 | Shifting Letters | Medium | | 849 | Maximize Distance To Closest Person | Medium | | 850 | Rectangle Area II | Hard | | 851 | Loud And Rich | Medium | | 852 | Peak Index In A Mountain Array | Medium | | 853 | Car Fleet | Medium | | 854 | K Similar Strings | Hard | | 855 | Exam Room | Medium | | 856 | Score Of Parentheses | Medium | | 857 | Minimum Cost To Hire K Workers | Hard | | 858 | Mirror Reflection | Medium | | 859 | Buddy Strings | Easy | | 860 | Lemonade Change | Easy | | 861 | Score After Flipping Matrix | Medium | | 862 | Shortest Subarray With Sum At Least K | Hard | | 863 | All Nodes Distance K In Binary Tree | Medium | | 864 | Shortest Path To Get All Keys | Hard | | 865 | Smallest Subtree With All The Deepest Nodes | Medium | | 866 | Prime Palindrome | Medium | | 867 | Transpose Matrix | Easy | | 868 | Binary Gap | Easy | | 869 | Reordered Power Of 2 | Medium | | 870 | Advantage Shuffle | Medium | | 871 | Minimum Number Of Refueling Stops | Hard | | 872 | Leaf Similar Trees | Easy | | 873 | Length Of Longest Fibonacci Subsequence | Medium | | 874 | Walking Robot Simulation | Medium | | 875 | Koko Eating Bananas | Medium | | 876 | Middle Of The Linked List | Easy | | 877 | Stone Game | Medium | | 878 | Nth Magical Number | Hard | | 879 | Profitable Schemes | Hard | | 880 | Decoded String At Index | Medium | | 881 | Boats To Save People | Medium | | 882 | Reachable Nodes In Subdivided Graph | Hard | | 883 | Projection Area Of 3d Shapes | Easy | | 884 | Uncommon Words From Two Sentences | Easy | | 885 | Spiral Matrix III | Medium | | 886 | Possible Bipartition | Medium | | 887 | Super Egg Drop | Hard | | 888 | Fair Candy Swap | Easy | | 889 | Construct Binary Tree From Preorder And Postorder Traversal | Medium | | 890 | Find And Replace Pattern | Medium | | 891 | Sum Of Subsequence Widths | Hard | | 892 | Surface Area Of 3d Shapes | Easy | | 893 | Groups Of Special Equivalent Strings | Medium | | 894 | All Possible Full Binary Trees | Medium | | 895 | Maximum Frequency Stack | Hard | | 896 | Monotonic Array | Easy | | 897 | Increasing Order Search Tree | Easy | | 898 | Bitwise Ors Of Subarrays | Medium | | 899 | Orderly Queue | Hard | | 900 | Rle Iterator | Medium | | 901 | Online Stock Span | Medium | | 902 | Numbers At Most N Given Digit Set | Hard | | 903 | Valid Permutations For Di Sequence | Hard | | 904 | Fruit Into Baskets | Medium | | 905 | Sort Array By Parity | Easy | | 906 | Super Palindromes | Hard | | 907 | Sum Of Subarray Minimums | Medium | | 908 | Smallest Range I | Easy | | 909 | Snakes And Ladders | Medium | | 910 | Smallest Range II | Medium | | 911 | Online Election | Medium | | 912 | Sort An Array | Medium | | 913 | Cat And Mouse | Hard | | 914 | X Of A Kind In A Deck Of Cards | Medium | | 915 | Partition Array Into Disjoint Intervals | Medium | | 916 | Word Subsets | Medium | | 917 | Reverse Only Letters | Easy | | 918 | Maximum Sum Circular Subarray | Medium | | 919 | Complete Binary Tree Inserter | Medium | | 920 | Number Of Music Playlists | Hard | | 921 | Minimum Add To Make Parentheses Valid | Medium | | 922 | Sort Array By Parity II | Easy | | 923 | 3sum With Multiplicity | Medium | | 924 | Minimize Malware Spread | Hard | | 925 | Long Pressed Name | Easy | | 926 | Flip String To Monotone Increasing | Medium | | 927 | Three Equal Parts | Hard | | 928 | Minimize Malware Spread II | Hard | | 929 | Unique Email Addresses | Easy | | 930 | Binary Subarrays With Sum | Medium | | 931 | Minimum Falling Path Sum | Medium | | 932 | Beautiful Array | Medium | | 933 | Number Of Recent Calls | Easy | | 934 | Shortest Bridge | Medium | | 935 | Knight Dialer | Medium | | 936 | Stamping The Sequence | Hard | | 937 | Reorder Data In Log Files | Medium | | 938 | Range Sum Of Bst | Easy | | 939 | Minimum Area Rectangle | Medium | | 940 | Distinct Subsequences II | Hard | | 941 | Valid Mountain Array | Easy | | 942 | Di String Match | Easy | | 943 | Find The Shortest Superstring | Hard | | 944 | Delete Columns to Make Sorted | Medium | | 945 | Minimum Increment To Make Array Unique | Medium | | 946 | Validate Stack Sequences | Medium | | 947 | Most Stones Removed With Same Row Or Column | Medium | | 948 | Bag Of Tokens | Medium | | 949 | Largest Time For Given Digits | Medium | | 950 | Reveal Cards In Increasing Order | Medium | | 951 | Flip Equivalent Binary Trees | Medium | | 952 | Largest Component Size By Common Factor | Hard | | 953 | Verifying An Alien Dictionary | Easy | | 954 | Array Of Doubled Pairs | Medium | | 955 | Delete Columns to Make Sorted II | Medium | | 956 | Tallest Billboard | Hard | | 957 | Prison Cells After N Days | Medium | | 958 | Check Completeness Of A Binary Tree | Medium | | 959 | Regions Cut By Slashes | Medium | | 960 | Delete Columns to Make Sorted III | Hard | | 961 | N-Repeated Element in Size 2N Array | Easy | | 962 | Maximum Width Ramp | Medium | | 963 | Minimum Area Rectangle II | Medium | | 964 | Least Operators To Express Number | Hard | | 965 | Univalued Binary Tree | Easy | | 966 | Vowel Spellchecker | Medium | | 967 | Numbers With Same Consecutive Differences | Medium | | 968 | Binary Tree Cameras | Hard | | 969 | Pancake Sorting | Medium | | 970 | Powerful Integers | Easy | | 971 | Flip Binary Tree To Match Preorder Traversal | Medium | | 972 | Equal Rational Numbers | Hard | | 973 | K Closest Points To Origin | Medium | | 974 | Subarray Sums Divisible By K | Medium | | 975 | Odd Even Jump | Hard | | 976 | Largest Perimeter Triangle | Easy | | 977 | Squares Of A Sorted Array | Easy | | 978 | Longest Turbulent Subarray | Medium | | 979 | Distribute Coins In Binary Tree | Medium | | 980 | Unique Paths III | Hard | | 981 | Time Based Key Value Store | Medium | | 982 | Triples With Bitwise And Equal To Zero | Hard | | 983 | Minimum Cost For Tickets | Medium | | 984 | String Without Aaa Or Bbb | Medium | | 985 | Sum Of Even Numbers After Queries | Easy | | 986 | Interval List Intersections | Medium | | 987 | Vertical Order Traversal Of A Binary Tree | Hard | | 988 | Smallest String Starting From Leaf | Medium | | 989 | Add To Array Form Of Integer | Easy | | 990 | Satisfiability Of Equality Equations | Medium | | 991 | Broken Calculator | Medium | | 992 | Subarrays With K Different Integers | Hard | | 993 | Cousins In Binary Tree | Easy | | 994 | Rotting Oranges | Medium | | 995 | Minimum Number Of K Consecutive Bit Flips | Hard | | 996 | Number Of Squareful Arrays | Hard | | 997 | Find The Town Judge | Easy | | 998 | Maximum Binary Tree II | Medium | | 999 | Available Captures For Rook | Easy | | 1000 | Minimum Cost To Merge Stones | Hard | | 1001 | Grid Illumination | Hard | | 1002 | Find Common Characters | Easy | | 1003 | Check If Word Is Valid After Substitutions | Medium | | 1004 | Max Consecutive Ones III | Medium | | 1005 | Maximize Sum Of Array After K Negations | Easy | | 1006 | Clumsy Factorial | Medium | | 1007 | Minimum Domino Rotations For Equal Row | Medium | | 1008 | Construct Binary Search Tree From Preorder Traversal | Medium | | 1009 | Complement of Base 10 Integer | Easy | | 1010 | Pairs Of Songs With Total Durations Divisible By 60 | Medium | | 1011 | Capacity To Ship Packages Within D Days | Medium | | 1012 | Numbers With Repeated Digits | Hard | | 1013 | Partition Array Into Three Parts With Equal Sum | Easy | | 1014 | Best Sightseeing Pair | Medium | | 1015 | Smallest Integer Divisible By K | Medium | | 1016 | Binary String With Substrings Representing 1 To N | Medium | | 1017 | Convert To Base 2 | Medium | | 1018 | Binary Prefix Divisible By 5 | Easy | | 1019 | Next Greater Node In Linked List | Medium | | 1020 | Number Of Enclaves | Medium | | 1021 | Remove Outermost Parentheses | Easy | | 1022 | Sum of Root To Leaf Binary Numbers | Easy | | 1023 | Camelcase Matching | Medium | | 1024 | Video Stitching | Medium | | 1025 | Divisor Game | Easy | | 1026 | Maximum Difference Between Node And Ancestor | Medium | | 1027 | Longest Arithmetic Subsequence | Medium | | 1028 | Recover A Tree From Preorder Traversal | Hard | | 1029 | Two City Scheduling | Medium | | 1030 | Matrix Cells In Distance Order | Easy | | 1031 | Maximum Sum Of Two Non Overlapping Subarrays | Medium | | 1032 | Stream Of Characters | Hard | | 1033 | Moving Stones Until Consecutive | Medium | | 1034 | Coloring A Border | Medium | | 1035 | Uncrossed Lines | Medium | | 1036 | Escape A Large Maze | Hard | | 1037 | Valid Boomerang | Easy | | 1038 | Binary Search Tree To Greater Sum Tree | Medium | | 1039 | Minimum Score Triangulation Of Polygon | Medium | | 1040 | Moving Stones Until Consecutive II | Medium | | 1041 | Robot Bounded In Circle | Medium | | 1042 | Flower Planting With No Adjacent | Medium | | 1043 | Partition Array For Maximum Sum | Medium | | 1044 | Longest Duplicate Substring | Hard | | 1045 | Customers Who Bought All Products | Medium | | 1046 | Last Stone Weight | Easy | | 1047 | Remove All Adjacent Duplicates In String | Easy | | 1048 | Longest String Chain | Medium | | 1049 | Last Stone Weight II | Medium | | 1050 | Actors and Directors Who Cooperated At Least Three Times | Easy | | 1051 | Height Checker | Easy | | 1052 | Grumpy Bookstore Owner | Medium | | 1053 | Previous Permutation With One Swap | Medium | | 1054 | Distant Barcodes | Medium | | 1055 | Shortest Way To Form String | Medium | | 1056 | Confusing Number | Easy | | 1057 | Campus Bikes | Medium | | 1058 | Minimize Rounding Error To Meet Target | Medium | | 1059 | All Paths From Source Lead To Destination | Medium | | 1060 | Missing Element In Sorted Array | Medium | | 1061 | Lexicographically Smallest Equivalent String | Medium | | 1062 | Longest Repeating Substring | Medium | | 1063 | Number Of Valid Subarrays | Hard | | 1064 | Fixed Point | Easy | | 1065 | Index Pairs Of A String | Easy | | 1066 | Campus Bikes Ii | Medium | | 1067 | Digit Count In Range | Hard | | 1068 | Product Sales Analysis I | Easy | | 1069 | Product Sales Analysis II | Easy | | 1070 | Product Sales Analysis III | Medium | | 1071 | Greatest Common Divisor Of Strings | Easy | | 1072 | Flip Columns For Maximum Number Of Equal Rows | Medium | | 1073 | Adding Two Negabinary Numbers | Medium | | 1074 | Number Of Submatrices That Sum To Target | Hard | | 1075 | Project Employees I | Easy | | 1076 | Project Employees II | Easy | | 1077 | Project Employees III | Medium | | 1078 | Occurrences After Bigram | Easy | | 1079 | Letter Tile Possibilities | Medium | | 1080 | Insufficient Nodes In Root To Leaf Paths | Medium | | 1081 | Smallest Subsequence Of Distinct Characters | Medium | | 1082 | Sales Analysis I | Easy | | 1083 | Sales Analysis II | Easy | | 1084 | Sales Analysis III | Easy | | 1085 | Sum Of Digits In The Minimum Number | Easy | | 1086 | High Five | Easy | | 1087 | Brace Expansion | Medium | | 1088 | Confusing Number Ii | Hard | | 1089 | Duplicate Zeros | Easy | | 1090 | Largest Values From Labels | Medium | | 1091 | Shortest Path In Binary Matrix | Medium | | 1092 | Shortest Common Supersequence | Hard | | 1093 | Statistics From A Large Sample | Medium | | 1094 | Car Pooling | Medium | | 1095 | Find In Mountain Array | Hard | | 1096 | Brace Expansion II | Hard | | 1097 | Game Play Analysis V | Hard | | 1098 | Unpopular Books | Medium | | 1099 | Two Sum Less Than K | Easy | | 1100 | Find K Length Substrings With No Repeated Characters | Medium | | 1101 | The Earliest Moment When Everyone Become Friends | Medium | | 1102 | Path With Maximum Minimum Value | Medium | | 1103 | Distribute Candies To People | Easy | | 1104 | Path In Zigzag Labelled Binary Tree | Medium | | 1105 | Filling Bookcase Shelves | Medium | | 1106 | Parsing A Boolean Expression | Hard | | 1107 | New Users Daily Count | Medium |
| 1108 | Defanging An Ip Address | Easy | | 1109 | Corporate Flight Bookings | Medium | | 1110 | Delete Nodes And Return Forest | Medium | | 1111 | Maximum Nesting Depth Of Two Valid Parentheses Strings | Medium | | 1112 | Highest Grade For Each Student | Medium | | 1113 | Reported Posts. | Easy | | 1114 | Print In Order | Easy | | 1115 | Print Foobar Alternately | Medium | | 1116 | Print Zero Even Odd | Medium | | 1117 | Building H2o | Medium | | 1118 | Number Of Days In A Month | Easy | | 1119 | Remove Vowels From A String | Easy | | 1120 | Maximum Average Subtree | Medium | | 1121 | Divide Array Into Increasing Sequences | Hard | | 1122 | Relative Sort Array | Easy | | 1123 | Lowest Common Ancestor Of Deepest Leaves | Medium | 1124 | Longest Well Performing Interval | Medium | 1125 | Smallest Sufficient Team | Hard | 1126 | Active Businesses | Medium | 1127 | User Purchase Platform | Hard | 1128 | Number Of Equivalent Domino Pairs | Easy | 1129 | Shortest Path With Alternating Colors | Medium | 1130 | Minimum Cost Tree From Leaf Values | Medium | 1131 | Maximum Of Absolute Value Expression | Medium | 1132 | Reported Posts II | Medium | 1133 | Largest Unique Number | Easy | 1134 | Armstrong Number | Easy | 1135 | Connecting Cities With Minimum Cost | Medium | 1161 | Maximum Level Sum of a Binary Tree | Medium | | 1200 | Minimum Absolute Difference | Easy | | 1266 | Minimum Time Visiting All Points | Easy | | 1292 | Maximum Side Length of a Square with Sum Less than or Equal to Threshold | Medium | | 1339 | Maximum Product of Splitted Binary Tree | Medium | | 1351 | Count Negative Numbers in a Sorted Matrix | Easy | | 1356 | Sort Integers by The Number of 1 Bits | Easy | | 1382 | Balance a Binary Search Tree | Medium | | 1390 | Four Divisors | Medium | | 1404 | Number of Steps to Reduce a Number in Binary Representation to One | Medium | | 1411 | Number of Ways to Paint N × 3 Grid | Hard | | 1415 | The k-th Lexicographical String of All Happy Strings of Length n | Medium | | 1458 | Max Dot Product of Two Subsequences | Hard | | 1461 | Check If a String Contains All Binary Codes of Size K | Medium | | 1536 | Minimum Swaps to Arrange a Binary Grid | Medium | | 1545 | Find Kth Bit in Nth Binary String | Medium | | 1582 | Special Positions in a Binary Matrix | Easy | | 1594 | Maximum Non Negative Product in a Matrix | Medium | | 1622 | Fancy Sequence | Hard | | 1653 | Minimum Deletions to Make String Balanced | Medium | | 1680 | Concatenation of Consecutive Binary Numbers | Medium | | 1689 | Partitioning Into Minimum Number Of Deci-Binary Numbers | Medium | | 1727 | Largest Submatrix With Rearrangements | Medium | | 1758 | Minimum Changes To Make Alternating Binary String | Easy | | 1784 | Check if Binary String Has at Most One Segment of Ones | Easy | | 1877 | Minimize Maximum Pair Sum in Array | Medium | | 1878 | Get Biggest Three Rhombus Sums in a Grid | Medium | | 1886 | Determine Whether Matrix Can Be Obtained By Rotation | Easy | | 1888 | Minimum Number of Flips to Make the Binary String Alternating | Medium | | 1895 | Largest Magic Square | Medium | | 1970 | Last Day Where You Can Still Cross | Hard | | 1975 | Maximum Matrix Sum | Medium | | 1980 | Find Unique Binary String | Medium | | 1984 | Minimum Difference Between Highest and Lowest of K Scores | Easy | | 2054 | Two Best Non-Overlapping Events | Medium | | 2402 | Meeting Rooms III | Hard | | 2483 | Minimum Penalty for a Shop | Medium | | 2573 | Find the String with LCP | Hard | | 2839 | Check if Strings Can be Made Equal With Operations I | Easy | | 2840 | Check if Strings Can be Made Equal With Operations II | Medium | 2906 | Construct Product Matrix | Medium | | 2943 | Maximize Area of Square Hole in Grid | Medium | | 2946 | Matrix Similarity After Cyclic Shifts | Easy | | 2975 | Maximum Square Area by Removing Fences From a Field | Medium | | 2976 | Minimum Cost to Convert String I | Medium | | 2977 | Minimum Cost to Convert String II | Hard | | 3010 | Divide an Array Into Subarrays With Minimum Cost I | Easy | | 3047 | Find the Largest Area of Square Inside Two Rectangles | Medium | | 3070 | Count Submatrices with Top-Left Element and Sum Less Than k | Medium | | 3074 | Apple Redistribution into Boxes | Easy | | 3075 | Maximize Happiness of Selected Children | Medium | | 3129 | Find All Possible Stable Binary Arrays I | Medium | | 3130 | Find All Possible Stable Binary Arrays II | Hard | | 3212 | Count Submatrices With Equal Frequency of X and Y | Medium | | 3260 | Divide an Array Into Subarrays With Minimum Cost II | Hard | | 3296 | Minimum Number of Seconds to Make Mountain Height Zero | Medium | | 3314 | Construct the Minimum Bitwise Array I | Easy | | 3315 | Construct the Minimum Bitwise Array II | Medium | | 3379 | Transformed Array | Easy | | 3453 | Separate Squares I | Medium | | 3454 | Separate Squares II | Hard | | 3474 | Lexicographically Smallest Generated String | Hard | 3507 | Minimum Pair Removal to Sort Array I | Easy | | 3510 | Minimum Pair Removal to Sort Array II | Hard | | 3546 | Equal Sum Grid Partition I | Medium | | 3548 | Equal Sum Grid Partition II | Hard | | 3567 | Minimum Absolute Difference in Sliding Submatrix | Medium | | 3600 | Maximize Spanning Tree Stability with Upgrades | Hard | | 3634 | Minimum Removals to Balance Array | Medium | | 3637 | Trionic Array I | Easy | | 3640 | Trionic Array II | Hard | | 3643 | Flip Square Submatrix Vertically | Easy | | 3650 | Minimum Cost Path with Edge Reversals | Medium | | 3651 | Minimum Cost Path with Teleportations | Hard | | 3666 | Minimum Operations to Equalize Binary String | Hard | | 3713 | Longest Balanced Substring I | Medium | | 3714 | Longest Balanced Substring II | Medium | | 3719 | Longest Balanced Subarray I | Medium | | 3721 | Longest Balanced Subarray II | Hard |

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Copyright (c) 2025 Anuj Singh

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Well-structured LeetCode problem solutions in JavaScript, focusing on optimal time & space complexity, clean code, and interview-ready logic.

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