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Anuj9826/leetcode-javascript

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

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Well-structured Leetcode Problem Solutions (JavaScript)

JavaScript
Leetcode
License

Optimized solutions for Leetcode algorithmic problems.

Table of Contents

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
944 Delete Columns to Make Sorted Medium
955 Delete Columns to Make Sorted II Medium
960 Delete Columns to Make Sorted III Hard
961 N-Repeated Element in Size 2N Array Easy
1022 Sum of Root To Leaf Binary Numbers Easy
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
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
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
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
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
2943 Maximize Area of Square Hole in Grid Medium
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
3074 Apple Redistribution into Boxes Easy
3075 Maximize Happiness of Selected Children Medium
3129 Find All Possible Stable Binary Arrays I Medium
3260 Divide an Array Into Subarrays With Minimum Cost II Hard
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
3507 Minimum Pair Removal to Sort Array I Easy
3510 Minimum Pair Removal to Sort Array II Hard
3634 Minimum Removals to Balance Array Medium
3637 Trionic Array I Easy
3640 Trionic Array II Hard
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

MIT License

Copyright (c) 2025 Anuj Singh

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MIT License
Created December 18, 2025
Updated March 9, 2026