All contents and pictures on this website come from the Internet and are updated regularly every week. They are for personal study and research only, and should not be used for commercial purposes. Thank you for your cooperation.
Welcome to Subscribe On Youtube:
1 Two Sum Easy Normal
2 Add Two Numbers Medium Normal
3 Longest Substring Without Repeating Characters Medium Normal
4 Median of Two Sorted Arrays Hard Normal
5 Longest Palindromic Substring Medium Normal
6 ZigZag Conversion Medium Normal
7 Reverse Integer Easy Normal
8 String to Integer (atoi) Medium Normal
9 Palindrome Number Easy Normal
10 Regular Expression Matching Hard Normal
11 Container With Most Water Medium Normal
12 Integer to Roman Medium Normal
13 Roman to Integer Easy Normal
14 Longest Common Prefix Easy Normal
15 3Sum Medium Normal
16 3Sum Closest Medium Normal
17 Letter Combinations of a Phone Number Medium Normal
18 4Sum Medium Normal
19 Remove Nth Node From End of List Medium Normal
20 Valid Parentheses Easy Normal
21 Merge Two Sorted Lists Easy Normal
22 Generate Parentheses Medium Normal
23 Merge k Sorted Lists Hard Normal
24 Swap Nodes in Pairs Medium Normal
25 Reverse Nodes in k-Group Hard Normal
26 Remove Duplicates from Sorted Array Easy Normal
27 Remove Element Easy Normal
28 Implement strStr() Easy Normal
29 Divide Two Integers Medium Normal
30 Substring with Concatenation of All Words Hard Normal
31 Next Permutation Medium Normal
32 Longest Valid Parentheses Hard Normal
33 Search in Rotated Sorted Array Medium Normal
34 Find First and Last Position of Element in Sorted Array Medium Normal
35 Search Insert Position Easy Normal
36 Valid Sudoku Medium Normal
37 Sudoku Solver Hard Normal
38 Count and Say Easy Normal
39 Combination Sum Medium Normal
40 Combination Sum II Medium Normal
41 First Missing Positive Hard Normal
42 Trapping Rain Water Hard Normal
43 Multiply Strings Medium Normal
44 Wildcard Matching Hard Normal
45 Jump Game II Hard Normal
46 Permutations Medium Normal
47 Permutations II Medium Normal
48 Rotate Image Medium Normal
49 Group Anagrams Medium Normal
50 Pow(x, n) Medium Normal
51 N-Queens Hard Normal
52 N-Queens II Hard Normal
53 Maximum Subarray Easy Normal
54 Spiral Matrix Medium Normal
55 Jump Game Medium Normal
56 Merge Intervals Medium Normal
57 Insert Interval Hard Normal
58 Length of Last Word Easy Normal
59 Spiral Matrix II Medium Normal
60 Permutation Sequence Medium Normal
61 Rotate List Medium Normal
62 Unique Paths Medium Normal
63 Unique Paths II Medium Normal
64 Minimum Path Sum Medium Normal
65 Valid Number Hard Normal
66 Plus One Easy Normal
67 Add Binary Easy Normal
68 Text Justification Hard Normal
69 Sqrt(x) Easy Normal
70 Climbing Stairs Easy Normal
71 Simplify Path Medium Normal
72 Edit Distance Hard Normal
73 Set Matrix Zeroes Medium Normal
74 Search a 2D Matrix Medium Normal
75 Sort Colors Medium Normal
76 Minimum Window Substring Hard Normal
77 Combinations Medium Normal
78 Subsets Medium Normal
79 Word Search Medium Normal
80 Remove Duplicates from Sorted Array II Medium Normal
81 Search in Rotated Sorted Array II Medium Normal
82 Remove Duplicates from Sorted List II Medium Normal
83 Remove Duplicates from Sorted List Easy Normal
84 Largest Rectangle in Histogram Hard Normal
85 Maximal Rectangle Hard Normal
86 Partition List Medium Normal
87 Scramble String Hard Normal
88 Merge Sorted Array Easy Normal
89 Gray Code Medium Normal
90 Subsets II Medium Normal
91 Decode Ways Medium Normal
92 Reverse Linked List II Medium Normal
93 Restore IP Addresses Medium Normal
94 Binary Tree Inorder Traversal Medium Normal
95 Unique Binary Search Trees II Medium Normal
96 Unique Binary Search Trees Medium Normal
97 Interleaving String Hard Normal
98 Validate Binary Search Tree Medium Normal
99 Recover Binary Search Tree Hard Normal
100 Same Tree Easy Normal
101 Symmetric Tree Easy Normal
102 Binary Tree Level Order Traversal Medium Normal
103 Binary Tree Zigzag Level Order Traversal Medium Normal
104 Maximum Depth of Binary Tree Easy Normal
105 Construct Binary Tree from Preorder and Inorder Traversal Medium Normal
106 Construct Binary Tree from Inorder and Postorder Traversal Medium Normal
107 Binary Tree Level Order Traversal II Easy Normal
108 Convert Sorted Array to Binary Search Tree Easy Normal
109 Convert Sorted List to Binary Search Tree Medium Normal
110 Balanced Binary Tree Easy Normal
111 Minimum Depth of Binary Tree Easy Normal
112 Path Sum Easy Normal
113 Path Sum II Medium Normal
114 Flatten Binary Tree to Linked List Medium Normal
115 Distinct Subsequences Hard Normal
116 Populating Next Right Pointers in Each Node Medium Normal
117 Populating Next Right Pointers in Each Node II Medium Normal
118 Pascal's Triangle Easy Normal
119 Pascal's Triangle II Easy Normal
120 Triangle Medium Normal
121 Best Time to Buy and Sell Stock Easy Normal
122 Best Time to Buy and Sell Stock II Easy Normal
123 Best Time to Buy and Sell Stock III Hard Normal
124 Binary Tree Maximum Path Sum Hard Normal
125 Valid Palindrome Easy Normal
126 Word Ladder II Hard Normal
127 Word Ladder Medium Normal
128 Longest Consecutive Sequence Hard Normal
129 Sum Root to Leaf Numbers Medium Normal
130 Surrounded Regions Medium Normal
131 Palindrome Partitioning Medium Normal
132 Palindrome Partitioning II Hard Normal
133 Clone Graph Medium Normal
134 Gas Station Medium Normal
135 Candy Hard Normal
136 Single Number Easy Normal
137 Single Number II Medium Normal
138 Copy List with Random Pointer Medium Normal
139 Word Break Medium Normal
140 Word Break II Hard Normal
141 Linked List Cycle Easy Normal
142 Linked List Cycle II Medium Normal
143 Reorder List Medium Normal
144 Binary Tree Preorder Traversal Medium Normal
145 Binary Tree Postorder Traversal Hard Normal
146 LRU Cache Medium Normal
147 Insertion Sort List Medium Normal
148 Sort List Medium Normal
149 Max Points on a Line Hard Normal
150 Evaluate Reverse Polish Notation Medium Normal
151 Reverse Words in a String Medium Normal
152 Maximum Product Subarray Medium Normal
153 Find Minimum in Rotated Sorted Array Medium Normal
154 Find Minimum in Rotated Sorted Array II Hard Normal
155 Min Stack Easy Normal
156 Binary Tree Upside Down Medium Prime
157 Read N Characters Given Read4 Easy Prime
158 Read N Characters Given Read4 II - Call multiple times Hard Prime
159 Longest Substring with At Most Two Distinct Characters Medium Prime
160 Intersection of Two Linked Lists Easy Normal
161 One Edit Distance Medium Prime
162 Find Peak Element Medium Normal
163 Missing Ranges Medium Prime
164 Maximum Gap Hard Normal
165 Compare Version Numbers Medium Normal
166 Fraction to Recurring Decimal Medium Normal
167 Two Sum II - Input array is sorted Easy Normal
168 Excel Sheet Column Title Easy Normal
169 Majority Element Easy Normal
170 Two Sum III - Data structure design Easy Prime
171 Excel Sheet Column Number Easy Normal
172 Factorial Trailing Zeroes Easy Normal
173 Binary Search Tree Iterator Medium Normal
174 Dungeon Game Hard Normal
175 Combine Two Tables Easy Normal
176 Second Highest Salary Easy Normal
177 Nth Highest Salary Medium Normal
178 Rank Scores Medium Normal
179 Largest Number Medium Normal
180 Consecutive Numbers Medium Normal
181 Employees Earning More Than Their Managers Easy Normal
182 Duplicate Emails Easy Normal
183 Customers Who Never Order Easy Normal
184 Department Highest Salary Medium Normal
185 Department Top Three Salaries Hard Normal
186 Reverse Words in a String II Medium Prime
187 Repeated DNA Sequences Medium Normal
188 Best Time to Buy and Sell Stock IV Hard Normal
189 Rotate Array Easy Normal
190 Reverse Bits Easy Normal
191 Number of 1 Bits Easy Normal
192 Word Frequency Medium Normal
193 Valid Phone Numbers Easy Normal
194 Transpose File Medium Normal
195 Tenth Line Easy Normal
196 Delete Duplicate Emails Easy Normal
197 Rising Temperature Easy Normal
198 House Robber Easy Normal
199 Binary Tree Right Side View Medium Normal
200 Number of Islands Medium Normal
201 Bitwise AND of Numbers Range Medium Normal
202 Happy Number Easy Normal
203 Remove Linked List Elements Easy Normal
204 Count Primes Easy Normal
205 Isomorphic Strings Easy Normal
206 Reverse Linked List Easy Normal
207 Course Schedule Medium Normal
208 Implement Trie (Prefix Tree) Medium Normal
209 Minimum Size Subarray Sum Medium Normal
210 Course Schedule II Medium Normal
211 Add and Search Word - Data structure design Medium Normal
212 Word Search II Hard Normal
213 House Robber II Medium Normal
214 Shortest Palindrome Hard Normal
215 Kth Largest Element in an Array Medium Normal
216 Combination Sum III Medium Normal
217 Contains Duplicate Easy Normal
218 The Skyline Problem Hard Normal
219 Contains Duplicate II Easy Normal
220 Contains Duplicate III Medium Normal
221 Maximal Square Medium Normal
222 Count Complete Tree Nodes Medium Normal
223 Rectangle Area Medium Normal
224 Basic Calculator Hard Normal
225 Implement Stack using Queues Easy Normal
226 Invert Binary Tree Easy Normal
227 Basic Calculator II Medium Normal
228 Summary Ranges Medium Normal
229 Majority Element II Medium Normal
230 Kth Smallest Element in a BST Medium Normal
231 Power of Two Easy Normal
232 Implement Queue using Stacks Easy Normal
233 Number of Digit One Hard Normal
234 Palindrome Linked List Easy Normal
235 Lowest Common Ancestor of a Binary Search Tree Easy Normal
236 Lowest Common Ancestor of a Binary Tree Medium Normal
237 Delete Node in a Linked List Easy Normal
238 Product of Array Except Self Medium Normal
239 Sliding Window Maximum Hard Normal
240 Search a 2D Matrix II Medium Normal
241 Different Ways to Add Parentheses Medium Normal
242 Valid Anagram Easy Normal
243 Shortest Word Distance Easy Prime
244 Shortest Word Distance II Medium Prime
245 Shortest Word Distance III Medium Prime
246 Strobogrammatic Number Easy Prime
247 Strobogrammatic Number II Medium Prime
248 Strobogrammatic Number III Hard Prime
249 Group Shifted Strings Medium Prime
250 Count Univalue Subtrees Medium Prime
251 Flatten 2D Vector Medium Prime
252 Meeting Rooms Easy Prime
253 Meeting Rooms II Medium Prime
254 Factor Combinations Medium Prime
255 Verify Preorder Sequence in Binary Search Tree Medium Prime
256 Paint House Easy Prime
257 Binary Tree Paths Easy Normal
258 Add Digits Easy Normal
259 3Sum Smaller Medium Prime
260 Single Number III Medium Normal
261 Graph Valid Tree Medium Prime
262 Trips and Users Hard Normal
263 Ugly Number Easy Normal
264 Ugly Number II Medium Normal
265 Paint House II Hard Prime
266 Palindrome Permutation Easy Prime
267 Palindrome Permutation II Medium Prime
268 Missing Number Easy Normal
269 Alien Dictionary Hard Prime
270 Closest Binary Search Tree Value Easy Prime
271 Encode and Decode Strings Medium Prime
272 Closest Binary Search Tree Value II Hard Prime
273 Integer to English Words Hard Normal
274 H-Index Medium Normal
275 H-Index II Medium Normal
276 Paint Fence Easy Prime
277 Find the Celebrity Medium Prime
278 First Bad Version Easy Normal
279 Perfect Squares Medium Normal
280 Wiggle Sort Medium Prime
281 Zigzag Iterator Medium Prime
282 Expression Add Operators Hard Normal
283 Move Zeroes Easy Normal
284 Peeking Iterator Medium Normal
285 Inorder Successor in BST Medium Prime
286 Walls and Gates Medium Prime
287 Find the Duplicate Number Medium Normal
288 Unique Word Abbreviation Medium Prime
289 Game of Life Medium Normal
290 Word Pattern Easy Normal
291 Word Pattern II Hard Prime
292 Nim Game Easy Normal
293 Flip Game Easy Prime
294 Flip Game II Medium Prime
295 Find Median from Data Stream Hard Normal
296 Best Meeting Point Hard Prime
297 Serialize and Deserialize Binary Tree Hard Normal
298 Binary Tree Longest Consecutive Sequence Medium Prime
299 Bulls and Cows Easy Normal
300 Longest Increasing Subsequence Medium Normal
301 Remove Invalid Parentheses Hard Normal
302 Smallest Rectangle Enclosing Black Pixels Hard Prime
303 Range Sum Query - Immutable Easy Normal
304 Range Sum Query 2D - Immutable Medium Normal
305 Number of Islands II Hard Prime
306 Additive Number Medium Normal
307 Range Sum Query - Mutable Medium Normal
308 Range Sum Query 2D - Mutable Hard Prime
309 Best Time to Buy and Sell Stock with Cooldown Medium Normal
310 Minimum Height Trees Medium Normal
311 Sparse Matrix Multiplication Medium Prime
312 Burst Balloons Hard Normal
313 Super Ugly Number Medium Normal
314 Binary Tree Vertical Order Traversal Medium Prime
315 Count of Smaller Numbers After Self Hard Normal
316 Remove Duplicate Letters Hard Normal
317 Shortest Distance from All Buildings Hard Prime
318 Maximum Product of Word Lengths Medium Normal
319 Bulb Switcher Medium Normal
320 Generalized Abbreviation Medium Prime
321 Create Maximum Number Hard Normal
322 Coin Change Medium Normal
323 Number of Connected Components in an Undirected Graph Medium Prime
324 Wiggle Sort II Medium Normal
325 Maximum Size Subarray Sum Equals k Medium Prime
326 Power of Three Easy Normal
327 Count of Range Sum Hard Normal
328 Odd Even Linked List Medium Normal
329 Longest Increasing Path in a Matrix Hard Normal
330 Patching Array Hard Normal
331 Verify Preorder Serialization of a Binary Tree Medium Normal
332 Reconstruct Itinerary Medium Normal
333 Largest BST Subtree Medium Prime
334 Increasing Triplet Subsequence Medium Normal
335 Self Crossing Hard Normal
336 Palindrome Pairs Hard Normal
337 House Robber III Medium Normal
338 Counting Bits Medium Normal
339 Nested List Weight Sum Easy Prime
340 Longest Substring with At Most K Distinct Characters Hard Prime
341 Flatten Nested List Iterator Medium Normal
342 Power of Four Easy Normal
343 Integer Break Medium Normal
344 Reverse String Easy Normal
345 Reverse Vowels of a String Easy Normal
346 Moving Average from Data Stream Easy Prime
347 Top K Frequent Elements Medium Normal
348 Design Tic-Tac-Toe Medium Prime
349 Intersection of Two Arrays Easy Normal
350 Intersection of Two Arrays II Easy Normal
351 Android Unlock Patterns Medium Prime
352 Data Stream as Disjoint Intervals Hard Normal
353 Design Snake Game Medium Prime
354 Russian Doll Envelopes Hard Normal
355 Design Twitter Medium Normal
356 Line Reflection Medium Prime
357 Count Numbers with Unique Digits Medium Normal
358 Rearrange String k Distance Apart Hard Prime
359 Logger Rate Limiter Easy Prime
360 Sort Transformed Array Medium Prime
361 Bomb Enemy Medium Prime
362 Design Hit Counter Medium Prime
363 Max Sum of Rectangle No Larger Than K Hard Normal
364 Nested List Weight Sum II Medium Prime
365 Water and Jug Problem Medium Normal
366 Find Leaves of Binary Tree Medium Prime
367 Valid Perfect Square Easy Normal
368 Largest Divisible Subset Medium Normal
369 Plus One Linked List Medium Prime
370 Range Addition Medium Prime
371 Sum of Two Integers Easy Normal
372 Super Pow Medium Normal
373 Find K Pairs with Smallest Sums Medium Normal
374 Guess Number Higher or Lower Easy Normal
375 Guess Number Higher or Lower II Medium Normal
376 Wiggle Subsequence Medium Normal
377 Combination Sum IV Medium Normal
378 Kth Smallest Element in a Sorted Matrix Medium Normal
379 Design Phone Directory Medium Prime
380 Insert Delete GetRandom O(1) Medium Normal
381 Insert Delete GetRandom O(1) - Duplicates allowed Hard Normal
382 Linked List Random Node Medium Normal
383 Ransom Note Easy Normal
384 Shuffle an Array Medium Normal
385 Mini Parser Medium Normal
386 Lexicographical Numbers Medium Normal
387 First Unique Character in a String Easy Normal
388 Longest Absolute File Path Medium Normal
389 Find the Difference Easy Normal
390 Elimination Game Medium Normal
391 Perfect Rectangle Hard Normal
392 Is Subsequence Easy Normal
393 UTF-8 Validation Medium Normal
394 Decode String Medium Normal
395 Longest Substring with At Least K Repeating Characters Medium Normal
396 Rotate Function Medium Normal
397 Integer Replacement Medium Normal
398 Random Pick Index Medium Normal
399 Evaluate Division Medium Normal
400 Nth Digit Medium Normal
401 Binary Watch Easy Normal
402 Remove K Digits Medium Normal
403 Frog Jump Hard Normal
404 Sum of Left Leaves Easy Normal
405 Convert a Number to Hexadecimal Easy Normal
406 Queue Reconstruction by Height Medium Normal
407 Trapping Rain Water II Hard Normal
408 Valid Word Abbreviation Easy Prime
409 Longest Palindrome Easy Normal
410 Split Array Largest Sum Hard Normal
411 Minimum Unique Word Abbreviation Hard Prime
412 Fizz Buzz Easy Normal
413 Arithmetic Slices Medium Normal
414 Third Maximum Number Easy Normal
415 Add Strings Easy Normal
416 Partition Equal Subset Sum Medium Normal
417 Pacific Atlantic Water Flow Medium Normal
418 Sentence Screen Fitting Medium Prime
419 Battleships in a Board Medium Normal
420 Strong Password Checker Hard Normal
421 Maximum XOR of Two Numbers in an Array Medium Normal
422 Valid Word Square Easy Prime
423 Reconstruct Original Digits from English Medium Normal
424 Longest Repeating Character Replacement Medium Normal
425 Word Squares Hard Prime
426 Convert Binary Search Tree to Sorted Doubly Linked List Medium Prime
427 Construct Quad Tree Medium Normal
428 Serialize and Deserialize N-ary Tree Hard Prime
429 N-ary Tree Level Order Traversal Medium Normal
430 Flatten a Multilevel Doubly Linked List Medium Normal
431 Encode N-ary Tree to Binary Tree Hard Prime
432 All O`one Data Structure Hard Normal
433 Minimum Genetic Mutation Medium Normal
434 Number of Segments in a String Easy Normal
435 Non-overlapping Intervals Medium Normal
436 Find Right Interval Medium Normal
437 Path Sum III Easy Normal
438 Find All Anagrams in a String Medium Normal
439 Ternary Expression Parser Medium Prime
440 K-th Smallest in Lexicographical Order Hard Normal
441 Arranging Coins Easy Normal
442 Find All Duplicates in an Array Medium Normal
443 String Compression Easy Normal
444 Sequence Reconstruction Medium Prime
445 Add Two Numbers II Medium Normal
446 Arithmetic Slices II - Subsequence Hard Normal
447 Number of Boomerangs Easy Normal
448 Find All Numbers Disappeared in an Array Easy Normal
449 Serialize and Deserialize BST Medium Normal
450 Delete Node in a BST Medium Normal
451 Sort Characters By Frequency Medium Normal
452 Minimum Number of Arrows to Burst Balloons Medium Normal
453 Minimum Moves to Equal Array Elements Easy Normal
454 4Sum II Medium Normal
455 Assign Cookies Easy Normal
456 132 Pattern Medium Normal
457 Circular Array Loop Medium Normal
458 Poor Pigs Hard Normal
459 Repeated Substring Pattern Easy Normal
460 LFU Cache Hard Normal
461 Hamming Distance Easy Normal
462 Minimum Moves to Equal Array Elements II Medium Normal
463 Island Perimeter Easy Normal
464 Can I Win Medium Normal
465 Optimal Account Balancing Hard Prime
466 Count The Repetitions Hard Normal
467 Unique Substrings in Wraparound String Medium Normal
468 Validate IP Address Medium Normal
469 Convex Polygon Medium Prime
470 Implement Rand10() Using Rand7() Medium Normal
471 Encode String with Shortest Length Hard Prime
472 Concatenated Words Hard Normal
473 Matchsticks to Square Medium Normal
474 Ones and Zeroes Medium Normal
475 Heaters Easy Normal
476 Number Complement Easy Normal
477 Total Hamming Distance Medium Normal
478 Generate Random Point in a Circle Medium Normal
479 Largest Palindrome Product Hard Normal
480 Sliding Window Median Hard Normal
481 Magical String Medium Normal
482 License Key Formatting Easy Normal
483 Smallest Good Base Hard Normal
484 Find Permutation Medium Prime
485 Max Consecutive Ones Easy Normal
486 Predict the Winner Medium Normal
487 Max Consecutive Ones II Medium Prime
488 Zuma Game Hard Normal
489 Robot Room Cleaner Hard Prime
490 The Maze Medium Prime
491 Increasing Subsequences Medium Normal
492 Construct the Rectangle Easy Normal
493 Reverse Pairs Hard Normal
494 Target Sum Medium Normal
495 Teemo Attacking Medium Normal
496 Next Greater Element I Easy Normal
497 Random Point in Non-overlapping Rectangles Medium Normal
498 Diagonal Traverse Medium Normal
499 The Maze III Hard Prime
500 Keyboard Row Easy Normal
501 Find Mode in Binary Search Tree Easy Normal
502 IPO Hard Normal
503 Next Greater Element II Medium Normal
504 Base 7 Easy Normal
505 The Maze II Medium Prime
506 Relative Ranks Easy Normal
507 Perfect Number Easy Normal
508 Most Frequent Subtree Sum Medium Normal
509 Fibonacci Number Easy Normal
510 Inorder Successor in BST II Medium Prime
511 Game Play Analysis I Easy Prime
512 Game Play Analysis II Easy Prime
513 Find Bottom Left Tree Value Medium Normal
514 Freedom Trail Hard Normal
515 Find Largest Value in Each Tree Row Medium Normal
516 Longest Palindromic Subsequence Medium Normal
517 Super Washing Machines Hard Normal
518 Coin Change 2 Medium Normal
519 Random Flip Matrix Medium Normal
520 Detect Capital Easy Normal
521 Longest Uncommon Subsequence I Easy Normal
522 Longest Uncommon Subsequence II Medium Normal
523 Continuous Subarray Sum Medium Normal
524 Longest Word in Dictionary through Deleting Medium Normal
525 Contiguous Array Medium Normal
526 Beautiful Arrangement Medium Normal
527 Word Abbreviation Hard Prime
528 Random Pick with Weight Medium Normal
529 Minesweeper Medium Normal
530 Minimum Absolute Difference in BST Easy Normal
531 Lonely Pixel I Medium Prime
532 K-diff Pairs in an Array Easy Normal
533 Lonely Pixel II Medium Prime
534 Game Play Analysis III Medium Prime
535 Encode and Decode TinyURL Medium Normal
536 Construct Binary Tree from String Medium Prime
537 Complex Number Multiplication Medium Normal
538 Convert BST to Greater Tree Easy Normal
539 Minimum Time Difference Medium Normal
540 Single Element in a Sorted Array Medium Normal
541 Reverse String II Easy Normal
542 01 Matrix Medium Normal
543 Diameter of Binary Tree Easy Normal
544 Output Contest Matches Medium Prime
545 Boundary of Binary Tree Medium Prime
546 Remove Boxes Hard Normal
547 Friend Circles Medium Normal
548 Split Array with Equal Sum Medium Prime
549 Binary Tree Longest Consecutive Sequence II Medium Prime
550 Game Play Analysis IV Medium Prime
551 Student Attendance Record I Easy Normal
552 Student Attendance Record II Hard Normal
553 Optimal Division Medium Normal
554 Brick Wall Medium Normal
555 Split Concatenated Strings Medium Prime
556 Next Greater Element III Medium Normal
557 Reverse Words in a String III Easy Normal
558 Quad Tree Intersection Medium Normal
559 Maximum Depth of N-ary Tree Easy Normal
560 Subarray Sum Equals K Medium Normal
561 Array Partition I Easy Normal
562 Longest Line of Consecutive One in Matrix Medium Prime
563 Binary Tree Tilt Easy Normal
564 Find the Closest Palindrome Hard Normal
565 Array Nesting Medium Normal
566 Reshape the Matrix Easy Normal
567 Permutation in String Medium Normal
568 Maximum Vacation Days Hard Prime
569 Median Employee Salary Hard Prime
570 Managers with at Least 5 Direct Reports Medium Prime
571 Find Median Given Frequency of Numbers Hard Prime
572 Subtree of Another Tree Easy Normal
573 Squirrel Simulation Medium Prime
574 Winning Candidate Medium Prime
575 Distribute Candies Easy Normal
576 Out of Boundary Paths Medium Normal
577 Employee Bonus Easy Prime
578 Get Highest Answer Rate Question Medium Prime
579 Find Cumulative Salary of an Employee Hard Prime
580 Count Student Number in Departments Medium Prime
581 Shortest Unsorted Continuous Subarray Easy Normal
582 Kill Process Medium Prime
583 Delete Operation for Two Strings Medium Normal
584 Find Customer Referee Easy Prime
585 Investments in 2016 Medium Prime
586 Customer Placing the Largest Number of Orders Easy Prime
587 Erect the Fence Hard Normal
588 Design In-Memory File System Hard Prime
589 N-ary Tree Preorder Traversal Easy Normal
590 N-ary Tree Postorder Traversal Easy Normal
591 Tag Validator Hard Normal
592 Fraction Addition and Subtraction Medium Normal
593 Valid Square Medium Normal
594 Longest Harmonious Subsequence Easy Normal
595 Big Countries Easy Normal
596 Classes More Than 5 Students Easy Normal
597 Friend Requests I: Overall Acceptance Rate Easy Prime
598 Range Addition II Easy Normal
599 Minimum Index Sum of Two Lists Easy Normal
600 Non-negative Integers without Consecutive Ones Hard Normal
601 Human Traffic of Stadium Hard Normal
602 Friend Requests II: Who Has the Most Friends Medium Prime
603 Consecutive Available Seats Easy Prime
604 Design Compressed String Iterator Easy Prime
605 Can Place Flowers Easy Normal
606 Construct String from Binary Tree Easy Normal
607 Sales Person Easy Prime
608 Tree Node Medium Prime
609 Find Duplicate File in System Medium Normal
610 Triangle Judgement Easy Prime
611 Valid Triangle Number Medium Normal
612 Shortest Distance in a Plane Medium Prime
613 Shortest Distance in a Line Easy Prime
614 Second Degree Follower Medium Prime
615 Average Salary: Departments VS Company Hard Prime
616 Add Bold Tag in String Medium Prime
617 Merge Two Binary Trees Easy Normal
618 Students Report By Geography Hard Prime
619 Biggest Single Number Easy Prime
620 Not Boring Movies Easy Normal
621 Task Scheduler Medium Normal
622 Design Circular Queue Medium Normal
623 Add One Row to Tree Medium Normal
624 Maximum Distance in Arrays Easy Prime
625 Minimum Factorization Medium Prime
626 Exchange Seats Medium Normal
627 Swap Salary
628 Maximum Product of Three Numbers Easy Normal
629 K Inverse Pairs Array Hard Normal
630 Course Schedule III Hard Normal
631 Design Excel Sum Formula Hard Prime
632 Smallest Range Covering Elements from K Lists Hard Normal
633 Sum of Square Numbers Easy Normal
634 Find the Derangement of An Array Medium Prime
635 Design Log Storage System Medium Prime
636 Exclusive Time of Functions Medium Normal
637 Average of Levels in Binary Tree Easy Normal
638 Shopping Offers Medium Normal
639 Decode Ways II Hard Normal
640 Solve the Equation Medium Normal
641 Design Circular Deque Medium Normal
642 Design Search Autocomplete System Hard Prime
643 Maximum Average Subarray I Easy Normal
644 Maximum Average Subarray II Hard Prime
645 Set Mismatch Easy Normal
646 Maximum Length of Pair Chain Medium Normal
647 Palindromic Substrings Medium Normal
648 Replace Words Medium Normal
649 Dota2 Senate Medium Normal
650 2 Keys Keyboard Medium Normal
651 4 Keys Keyboard Medium Prime
652 Find Duplicate Subtrees Medium Normal
653 Two Sum IV - Input is a BST Easy Normal
654 Maximum Binary Tree Medium Normal
655 Print Binary Tree Medium Normal
656 Coin Path Hard Prime
657 Robot Return to Origin Easy Normal
658 Find K Closest Elements Medium Normal
659 Split Array into Consecutive Subsequences Medium Normal
660 Remove 9 Hard Prime
661 Image Smoother Easy Normal
662 Maximum Width of Binary Tree Medium Normal
663 Equal Tree Partition Medium Prime
664 Strange Printer Hard Normal
665 Non-decreasing Array Easy Normal
666 Path Sum IV Medium Prime
667 Beautiful Arrangement II Medium Normal
668 Kth Smallest Number in Multiplication Table Hard Normal
669 Trim a Binary Search Tree Easy Normal
670 Maximum Swap Medium Normal
671 Second Minimum Node In a Binary Tree Easy Normal
672 Bulb Switcher II Medium Normal
673 Number of Longest Increasing Subsequence Medium Normal
674 Longest Continuous Increasing Subsequence Easy Normal
675 Cut Off Trees for Golf Event Hard Normal
676 Implement Magic Dictionary Medium Normal
677 Map Sum Pairs Medium Normal
678 Valid Parenthesis String Medium Normal
679 24 Game Hard Normal
680 Valid Palindrome II Easy Normal
681 Next Closest Time Medium Prime
682 Baseball Game Easy Normal
683 K Empty Slots Hard Prime
684 Redundant Connection Medium Normal
685 Redundant Connection II Hard Normal
686 Repeated String Match Easy Normal
687 Longest Univalue Path Easy Normal
688 Knight Probability in Chessboard Medium Normal
689 Maximum Sum of 3 Non-Overlapping Subarrays Hard Normal
690 Employee Importance Easy Normal
691 Stickers to Spell Word Hard Normal
692 Top K Frequent Words Medium Normal
693 Binary Number with Alternating Bits Easy Normal
694 Number of Distinct Islands Medium Prime
695 Max Area of Island Medium Normal
696 Count Binary Substrings Easy Normal
697 Degree of an Array Easy Normal
698 Partition to K Equal Sum Subsets Medium Normal
699 Falling Squares Hard Normal
700 Search in a Binary Search Tree Easy Normal
701 Insert into a Binary Search Tree Medium Normal
702 Search in a Sorted Array of Unknown Size Medium Prime
703 Kth Largest Element in a Stream Easy Normal
704 Binary Search Easy Normal
705 Design HashSet Easy Normal
706 Design HashMap Easy Normal
707 Design Linked List Medium Normal
708 Insert into a Cyclic Sorted List Medium Prime
709 To Lower Case Easy Normal
710 Random Pick with Blacklist Hard Normal
711 Number of Distinct Islands II Hard Prime
712 Minimum ASCII Delete Sum for Two Strings Medium Normal
713 Subarray Product Less Than K Medium Normal
714 Best Time to Buy and Sell Stock with Transaction Fee Medium Normal
715 Range Module Hard Normal
716 Max Stack Easy Prime
717 1-bit and 2-bit Characters Easy Normal
718 Maximum Length of Repeated Subarray Medium Normal
719 Find K-th Smallest Pair Distance Hard Normal
720 Longest Word in Dictionary Easy Normal
721 Accounts Merge Medium Normal
722 Remove Comments Medium Normal
723 Candy Crush Medium Prime
724 Find Pivot Index Easy Normal
725 Split Linked List in Parts Medium Normal
726 Number of Atoms Hard Normal
727 Minimum Window Subsequence Hard Prime
728 Self Dividing Numbers Easy Normal
729 My Calendar I Medium Normal
730 Count Different Palindromic Subsequences Hard Normal
731 My Calendar II Medium Normal
732 My Calendar III Hard Normal
733 Flood Fill Easy Normal
734 Sentence Similarity Easy Prime
735 Asteroid Collision Medium Normal
736 Parse Lisp Expression Hard Normal
737 Sentence Similarity II Medium Prime
738 Monotone Increasing Digits Medium Normal
739 Daily Temperatures Medium Normal
740 Delete and Earn Medium Normal
741 Cherry Pickup Hard Normal
742 Closest Leaf in a Binary Tree Medium Prime
743 Network Delay Time Medium Normal
744 Find Smallest Letter Greater Than Target Easy Normal
745 Prefix and Suffix Search Hard Normal
746 Min Cost Climbing Stairs Easy Normal
747 Largest Number At Least Twice of Others Easy Normal
748 Shortest Completing Word Easy Normal
749 Contain Virus Hard Normal
750 Number Of Corner Rectangles Medium Prime
751 IP to CIDR Easy Prime
752 Open the Lock Medium Normal
753 Cracking the Safe Hard Normal
754 Reach a Number Medium Normal
755 Pour Water Medium Prime
756 Pyramid Transition Matrix Medium Normal
757 Set Intersection Size At Least Two Hard Normal
758 Bold Words in String Easy Prime
759 Employee Free Time Hard Prime
760 Find Anagram Mappings Easy Prime
761 Special Binary String Hard Normal
762 Prime Number of Set Bits in Binary Representation Easy Normal
763 Partition Labels Medium Normal
764 Largest Plus Sign Medium Normal
765 Couples Holding Hands Hard Normal
766 Toeplitz Matrix Easy Normal
767 Reorganize String Medium Normal
768 Max Chunks To Make Sorted II Hard Normal
769 Max Chunks To Make Sorted Medium Normal
770 Basic Calculator IV Hard Normal
771 Jewels and Stones Easy Normal
772 Basic Calculator III Hard Prime
773 Sliding Puzzle Hard Normal
774 Minimize Max Distance to Gas Station Hard Prime
775 Global and Local Inversions Medium Normal
776 Split BST Medium Prime
777 Swap Adjacent in LR String Medium Normal
778 Swim in Rising Water Hard Normal
779 K-th Symbol in Grammar Medium Normal
780 Reaching Points Hard Normal
781 Rabbits in Forest Medium Normal
782 Transform to Chessboard Hard Normal
783 Minimum Distance Between BST Nodes Easy Normal
784 Letter Case Permutation Easy Normal
785 Is Graph Bipartite? Medium Normal
786 K-th Smallest Prime Fraction Hard Normal
787 Cheapest Flights Within K Stops Medium Normal
788 Rotated Digits Easy Normal
789 Escape The Ghosts Medium Normal
790 Domino and Tromino Tiling Medium Normal
791 Custom Sort String Medium Normal
792 Number of Matching Subsequences Medium Normal
793 Preimage Size of Factorial Zeroes Function Hard Normal
794 Valid Tic-Tac-Toe State Medium Normal
795 Number of Subarrays with Bounded Maximum Medium Normal
796 Rotate String Easy Normal
797 All Paths From Source to Target Medium Normal
798 Smallest Rotation with Highest Score Hard Normal
799 Champagne Tower Medium Normal
800 Similar RGB Color Easy Prime
801 Minimum Swaps To Make Sequences Increasing Medium Normal
802 Find Eventual Safe States Medium Normal
803 Bricks Falling When Hit Hard Normal
804 Unique Morse Code Words Easy Normal
805 Split Array With Same Average Hard Normal
806 Number of Lines To Write String Easy Normal
807 Max Increase to Keep City Skyline Medium Normal
808 Soup Servings Medium Normal
809 Expressive Words Medium Normal
810 Chalkboard XOR Game Hard Normal
811 Subdomain Visit Count Easy Normal
812 Largest Triangle Area Easy Normal
813 Largest Sum of Averages Medium Normal
814 Binary Tree Pruning Medium Normal
815 Bus Routes Hard Normal
816 Ambiguous Coordinates Medium Normal
817 Linked List Components Medium Normal
818 Race Car Hard Normal
819 Most Common Word Easy Normal
820 Short Encoding of Words Medium Normal
821 Shortest Distance to a Character Easy Normal
822 Card Flipping Game Medium Normal
823 Binary Trees With Factors Medium Normal
824 Goat Latin Easy Normal
825 Friends Of Appropriate Ages Medium Normal
826 Most Profit Assigning Work Medium Normal
827 Making A Large Island Hard Normal
828 Unique Letter String Hard Normal
829 Consecutive Numbers Sum Hard Normal
830 Positions of Large Groups Easy Normal
831 Masking Personal Information Medium Normal
832 Flipping an Image Easy Normal
833 Find And Replace in String Medium Normal
834 Sum of Distances in Tree Hard Normal
835 Image Overlap Medium Normal
836 Rectangle Overlap Easy Normal
837 New 21 Game Medium Normal
838 Push Dominoes Medium Normal
839 Similar String Groups Hard Normal
840 Magic Squares In Grid Easy Normal
841 Keys and Rooms Medium Normal
842 Split Array into Fibonacci Sequence Medium Normal
843 Guess the Word Hard Normal
844 Backspace String Compare Easy Normal
845 Longest Mountain in Array Medium Normal
846 Hand of Straights Medium Normal
847 Shortest Path Visiting All Nodes Hard Normal
848 Shifting Letters Medium Normal
849 Maximize Distance to Closest Person Easy Normal
850 Rectangle Area II Hard Normal
851 Loud and Rich Medium Normal
852 Peak Index in a Mountain Array Easy Normal
853 Car Fleet Medium Normal
854 K-Similar Strings Hard Normal
855 Exam Room Medium Normal
856 Score of Parentheses Medium Normal
857 Minimum Cost to Hire K Workers Hard Normal
858 Mirror Reflection Medium Normal
859 Buddy Strings Easy Normal
860 Lemonade Change Easy Normal
861 Score After Flipping Matrix Medium Normal
862 Shortest Subarray with Sum at Least K Hard Normal
863 All Nodes Distance K in Binary Tree Medium Normal
864 Shortest Path to Get All Keys Hard Normal
865 Smallest Subtree with all the Deepest Nodes Medium Normal
866 Prime Palindrome Medium Normal
867 Transpose Matrix Easy Normal
868 Binary Gap Easy Normal
869 Reordered Power of 2 Medium Normal
870 Advantage Shuffle Medium Normal
871 Minimum Number of Refueling Stops Hard Normal
872 Leaf-Similar Trees Easy Normal
873 Length of Longest Fibonacci Subsequence Medium Normal
874 Walking Robot Simulation Easy Normal
875 Koko Eating Bananas Medium Normal
876 Middle of the Linked List Easy Normal
877 Stone Game Medium Normal
878 Nth Magical Number Hard Normal
879 Profitable Schemes Hard Normal
880 Decoded String at Index Medium Normal
881 Boats to Save People Medium Normal
882 Reachable Nodes In Subdivided Graph Hard Normal
883 Projection Area of 3D Shapes Easy Normal
884 Uncommon Words from Two Sentences Easy Normal
885 Spiral Matrix III Medium Normal
886 Possible Bipartition Medium Normal
887 Super Egg Drop Hard Normal
888 Fair Candy Swap Easy Normal
889 Construct Binary Tree from Preorder and Postorder Traversal Medium Normal
890 Find and Replace Pattern Medium Normal
891 Sum of Subsequence Widths Hard Normal
892 Surface Area of 3D Shapes Easy Normal
893 Groups of Special-Equivalent Strings Easy Normal
894 All Possible Full Binary Trees Medium Normal
895 Maximum Frequency Stack Hard Normal
896 Monotonic Array Easy Normal
897 Increasing Order Search Tree Easy Normal
898 Bitwise ORs of Subarrays Medium Normal
899 Orderly Queue Hard Normal
900 RLE Iterator Medium Normal
901 Online Stock Span Medium Normal
902 Numbers At Most N Given Digit Set Hard Normal
903 Valid Permutations for DI Sequence Hard Normal
904 Fruit Into Baskets Medium Normal
905 Sort Array By Parity Easy Normal
906 Super Palindromes Hard Normal
907 Sum of Subarray Minimums Medium Normal
908 Smallest Range I Easy Normal
909 Snakes and Ladders Medium Normal
910 Smallest Range II Medium Normal
911 Online Election Medium Normal
912 Sort an Array Medium Normal
913 Cat and Mouse Hard Normal
914 X of a Kind in a Deck of Cards Easy Normal
915 Partition Array into Disjoint Intervals Medium Normal
916 Word Subsets Medium Normal
917 Reverse Only Letters Easy Normal
918 Maximum Sum Circular Subarray Medium Normal
919 Complete Binary Tree Inserter Medium Normal
920 Number of Music Playlists Hard Normal
921 Minimum Add to Make Parentheses Valid Medium Normal
922 Sort Array By Parity II Easy Normal
923 3Sum With Multiplicity Medium Normal
924 Minimize Malware Spread Hard Normal
925 Long Pressed Name Easy Normal
926 Flip String to Monotone Increasing Medium Normal
927 Three Equal Parts Hard Normal
928 Minimize Malware Spread II Hard Normal
929 Unique Email Addresses Easy Normal
930 Binary Subarrays With Sum Medium Normal
931 Minimum Falling Path Sum Medium Normal
932 Beautiful Array Medium Normal
933 Number of Recent Calls Easy Normal
934 Shortest Bridge Medium Normal
935 Knight Dialer Medium Normal
936 Stamping The Sequence Hard Normal
937 Reorder Data in Log Files Easy Normal
938 Range Sum of BST Easy Normal
939 Minimum Area Rectangle Medium Normal
940 Distinct Subsequences II Hard Normal
941 Valid Mountain Array Easy Normal
942 DI String Match Easy Normal
943 Find the Shortest Superstring Hard Normal
944 Delete Columns to Make Sorted Easy Normal
945 Minimum Increment to Make Array Unique Medium Normal
946 Validate Stack Sequences Medium Normal
947 Most Stones Removed with Same Row or Column Medium Normal
948 Bag of Tokens Medium Normal
949 Largest Time for Given Digits Easy Normal
950 Reveal Cards In Increasing Order Medium Normal
951 Flip Equivalent Binary Trees Medium Normal
952 Largest Component Size by Common Factor Hard Normal
953 Verifying an Alien Dictionary Easy Normal
954 Array of Doubled Pairs Medium Normal
955 Delete Columns to Make Sorted II Medium Normal
956 Tallest Billboard Hard Normal
957 Prison Cells After N Days Medium Normal
958 Check Completeness of a Binary Tree Medium Normal
959 Regions Cut By Slashes Medium Normal
960 Delete Columns to Make Sorted III Hard Normal
961 N-Repeated Element in Size 2N Array Easy Normal
962 Maximum Width Ramp Medium Normal
963 Minimum Area Rectangle II Medium Normal
964 Least Operators to Express Number Hard Normal
965 Univalued Binary Tree Easy Normal
966 Vowel Spellchecker Medium Normal
967 Numbers With Same Consecutive Differences Medium Normal
968 Binary Tree Cameras Hard Normal
969 Pancake Sorting Medium Normal
970 Powerful Integers Easy Normal
971 Flip Binary Tree To Match Preorder Traversal Medium Normal
972 Equal Rational Numbers Hard Normal
973 K Closest Points to Origin Medium Normal
974 Subarray Sums Divisible by K Medium Normal
975 Odd Even Jump Hard Normal
976 Largest Perimeter Triangle Easy Normal
977 Squares of a Sorted Array Easy Normal
978 Longest Turbulent Subarray Medium Normal
979 Distribute Coins in Binary Tree Medium Normal
980 Unique Paths III Hard Normal
981 Time Based Key-Value Store Medium Normal
982 Triples with Bitwise AND Equal To Zero Hard Normal
983 Minimum Cost For Tickets Medium Normal
984 String Without AAA or BBB Medium Normal
985 Sum of Even Numbers After Queries Easy Normal
986 Interval List Intersections Medium Normal
987 Vertical Order Traversal of a Binary Tree Medium Normal
988 Smallest String Starting From Leaf Medium Normal
989 Add to Array-Form of Integer Easy Normal
990 Satisfiability of Equality Equations Medium Normal
991 Broken Calculator Medium Normal
992 Subarrays with K Different Integers Hard Normal
993 Cousins in Binary Tree Easy Normal
994 Rotting Oranges Easy Normal
995 Minimum Number of K Consecutive Bit Flips Hard Normal
996 Number of Squareful Arrays Hard Normal
997 Find the Town Judge Easy Normal
998 Maximum Binary Tree II Medium Normal
999 Available Captures for Rook Easy Normal
1000 Minimum Cost to Merge Stones Hard Normal
1001 Grid Illumination Hard Normal
1002 Find Common Characters Easy Normal
1003 Check If Word Is Valid After Substitutions Medium Normal
1004 Max Consecutive Ones III Medium Normal
1005 Maximize Sum Of Array After K Negations Easy Normal
1006 Clumsy Factorial Medium Normal
1007 Minimum Domino Rotations For Equal Row Medium Normal
1008 Construct Binary Search Tree from Preorder Traversal Medium Normal
1009 Complement of Base 10 Integer Easy Normal
1010 Pairs of Songs With Total Durations Divisible by 60 Easy Normal
1011 Capacity To Ship Packages Within D Days Medium Normal
1012 Numbers With Repeated Digits Hard Normal
1013 Partition Array Into Three Parts With Equal Sum Easy Normal
1014 Best Sightseeing Pair Medium Normal
1015 Smallest Integer Divisible by K Medium Normal
1016 Binary String With Substrings Representing 1 To N Medium Normal
1017 Convert to Base -2 Medium Normal
1018 Binary Prefix Divisible By 5 Easy Normal
1019 Next Greater Node In Linked List Medium Normal
1020 Number of Enclaves Medium Normal
1021 Remove Outermost Parentheses Easy Normal
1022 Sum of Root To Leaf Binary Numbers Easy Normal
1023 Camelcase Matching Medium Normal
1024 Video Stitching Medium Normal
1025 Divisor Game Easy Normal
1026 Maximum Difference Between Node and Ancestor Medium Normal
1027 Longest Arithmetic Sequence Medium Normal
1028 Recover a Tree From Preorder Traversal Hard Normal
1029 Two City Scheduling Easy Normal
1030 Matrix Cells in Distance Order Easy Normal
1031 Maximum Sum of Two Non-Overlapping Subarrays Medium Normal
1032 Stream of Characters Hard Normal
1033 Moving Stones Until Consecutive Easy Normal
1034 Coloring A Border Medium Normal
1035 Uncrossed Lines Medium Normal
1036 Escape a Large Maze Hard Normal
1037 Valid Boomerang Easy Normal
1038 Binary Search Tree to Greater Sum Tree Medium Normal
1039 Minimum Score Triangulation of Polygon Medium Normal
1040 Moving Stones Until Consecutive II Medium Normal
1041 Robot Bounded In Circle Medium Normal
1042 Flower Planting With No Adjacent Easy Normal
1043 Partition Array for Maximum Sum Medium Normal
1044 Longest Duplicate Substring Hard Normal
1045 Customers Who Bought All Products Medium Prime
1046 Last Stone Weight Easy Normal
1047 Remove All Adjacent Duplicates In String Easy Normal
1048 Longest String Chain Medium Normal
1049 Last Stone Weight II Medium Normal
1050 Actors and Directors Who Cooperated At Least Three Times Easy Prime
1051 Height Checker Easy Normal
1052 Grumpy Bookstore Owner Medium Normal
1053 Previous Permutation With One Swap Medium Normal
1054 Distant Barcodes Medium Normal
1055 Shortest Way to Form String Medium Prime
1056 Confusing Number Easy Prime
1057 Campus Bikes Medium Prime
1058 Minimize Rounding Error to Meet Target Medium Prime
1059 All Paths from Source Lead to Destination Medium Prime
1060 Missing Element in Sorted Array Medium Prime
1061 Lexicographically Smallest Equivalent String Medium Prime
1062 Longest Repeating Substring Medium Prime
1063 Number of Valid Subarrays Hard Prime
1064 Fixed Point Easy Prime
1065 Index Pairs of a String Easy Prime
1066 Campus Bikes II Medium Prime
1067 Digit Count in Range Hard Prime
1068 Product Sales Analysis I Easy Prime
1069 Product Sales Analysis II Easy Prime
1070 Product Sales Analysis III Medium Prime
1071 Greatest Common Divisor of Strings Easy Normal
1072 Flip Columns For Maximum Number of Equal Rows Medium Normal
1073 Adding Two Negabinary Numbers Medium Normal
1074 Number of Submatrices That Sum to Target Hard Normal
1075 Project Employees I Easy Prime
1076 Project Employees II Easy Prime
1077 Project Employees III Medium Prime
1078 Occurrences After Bigram Easy Normal
1079 Letter Tile Possibilities Medium Normal
1080 Insufficient Nodes in Root to Leaf Paths Medium Normal
1081 Smallest Subsequence of Distinct Characters Medium Normal
1082 Sales Analysis I Easy Prime
1083 Sales Analysis II Easy Prime
1084 Sales Analysis III Easy Prime
1085 Sum of Digits in the Minimum Number Easy Prime
1086 High Five Easy Prime
1087 Brace Expansion Medium Prime
1088 Confusing Number II Hard Prime
1089 Duplicate Zeros Easy Normal
1090 Largest Values From Labels Medium Normal
1091 Shortest Path in Binary Matrix Medium Normal
1092 Shortest Common Supersequence Hard Normal
1093 Statistics from a Large Sample Medium Normal
1094 Car Pooling Medium Normal
1095 Find in Mountain Array Hard Normal
1096 Brace Expansion II Hard Normal
1097 Game Play Analysis V Hard Prime
1098 Unpopular Books Medium Prime
1099 Two Sum Less Than K Easy Prime
1100 Find K-Length Substrings With No Repeated Characters Medium Prime
1101 The Earliest Moment When Everyone Become Friends Medium Prime
1102 Path With Maximum Minimum Value Medium Prime
1103 Distribute Candies to People Easy Normal
1104 Path In Zigzag Labelled Binary Tree Medium Normal
1105 Filling Bookcase Shelves Medium Normal
1106 Parsing A Boolean Expression Hard Normal
1107 New Users Daily Count Medium Prime
1108 Defanging an IP Address Easy Normal
1109 Corporate Flight Bookings Medium Normal
1110 Delete Nodes And Return Forest Medium Normal
1111 Maximum Nesting Depth of Two Valid Parentheses Strings Medium Normal
1112 Highest Grade For Each Student Medium Prime
1113 Reported Posts Easy Prime
1114 Print in Order Easy Normal
1115 Print FooBar Alternately Medium Normal
1116 Print Zero Even Odd Medium Normal
1117 Building H2O Medium Normal
1118 Number of Days in a Month Easy Prime
1119 Remove Vowels from a String Easy Prime
1120 Maximum Average Subtree Medium Prime
1121 Divide Array Into Increasing Sequences Hard Prime
1122 Relative Sort Array Easy Normal
1123 Lowest Common Ancestor of Deepest Leaves Medium Normal
1124 Longest Well-Performing Interval Medium Normal
1125 Smallest Sufficient Team Hard Normal
1126 Active Businesses Medium Prime
1127 User Purchase Platform Hard Prime
1128 Number of Equivalent Domino Pairs Easy Normal
1129 Shortest Path with Alternating Colors Medium Normal
1130 Minimum Cost Tree From Leaf Values Medium Normal
1131 Maximum of Absolute Value Expression Medium Normal
1132 Reported Posts II Medium Prime
1133 Largest Unique Number Easy Prime
1134 Armstrong Number Easy Prime
1135 Connecting Cities With Minimum Cost Medium Prime
1136 Parallel Courses Hard Prime
1137 N-th Tribonacci Number Easy Normal
1138 Alphabet Board Path Medium Normal
1139 Largest 1-Bordered Square Medium Normal
1140 Stone Game II Medium Normal
1141 User Activity for the Past 30 Days I Easy Prime
1142 User Activity for the Past 30 Days II Easy Prime
1143 Longest Common Subsequence Medium Normal
1144 Decrease Elements To Make Array Zigzag Medium Normal
1145 Binary Tree Coloring Game Medium Normal
1146 Snapshot Array Medium Normal
1147 Longest Chunked Palindrome Decomposition Hard Normal
1148 Article Views I Easy Prime
1149 Article Views II Medium Prime
1150 Check If a Number Is Majority Element in a Sorted Array Easy Prime
1151 Minimum Swaps to Group All 1's Together Medium Prime
1152 Analyze User Website Visit Pattern Medium Prime
1153 String Transforms Into Another String Hard Prime
1154 Day of the Year Easy Normal
1155 Number of Dice Rolls With Target Sum Medium Normal
1156 Swap For Longest Repeated Character Substring Medium Normal
1157 Online Majority Element In Subarray Hard Normal
1158 Market Analysis I Medium Prime
1159 Market Analysis II Hard Prime
1160 Find Words That Can Be Formed by Characters Easy Normal
1161 Maximum Level Sum of a Binary Tree Medium Normal
1162 As Far from Land as Possible Medium Normal
1163 Last Substring in Lexicographical Order Hard Normal
1164 Product Price at a Given Date Medium Prime
1165 Single-Row Keyboard Easy Prime
1166 Design File System Medium Prime
1167 Minimum Cost to Connect Sticks Medium Prime
1168 Optimize Water Distribution in a Village Hard Prime
1169 Invalid Transactions Medium Normal
1170 Compare Strings by Frequency of the Smallest Character Easy Normal
1171 Remove Zero Sum Consecutive Nodes from Linked List Medium Normal
1172 Dinner Plate Stacks Hard Normal
1173 Immediate Food Delivery I Easy Prime
1174 Immediate Food Delivery II Medium Prime
1175 Prime Arrangements Easy Normal
1176 Diet Plan Performance Easy Prime
1177 Can Make Palindrome from Substring Medium Normal
1178 Number of Valid Words for Each Puzzle Hard Normal
1179 Reformat Department Table Easy Normal
1180 Count Substrings with Only One Distinct Letter Easy Prime
1181 Before and After Puzzle Medium Prime
1182 Shortest Distance to Target Color Medium Prime
1183 Maximum Number of Ones Hard Prime
1184 Distance Between Bus Stops Easy Normal
1185 Day of the Week Easy Normal
1186 Maximum Subarray Sum with One Deletion Medium Normal
1187 Make Array Strictly Increasing Hard Normal
1188 Design Bounded Blocking Queue Medium Prime
1189 Maximum Number of Balloons Easy Normal
1190 Reverse Substrings Between Each Pair of Parentheses Medium Normal
1191 K-Concatenation Maximum Sum Medium Normal
1192 Critical Connections in a Network Hard Normal
1193 Monthly Transactions I Medium Prime
1194 Tournament Winners Hard Prime
1195 Fizz Buzz Multithreaded Medium Normal
1196 How Many Apples Can You Put into the Basket Easy Prime
1197 Minimum Knight Moves Medium Prime
1198 Find Smallest Common Element in All Rows Medium Prime
1199 Minimum Time to Build Blocks Hard Prime
1200 Minimum Absolute Difference Easy Normal
1201 Ugly Number III Medium Normal
1202 Smallest String With Swaps Medium Normal
1203 Sort Items by Groups Respecting Dependencies Hard Normal
1204 Last Person to Fit in the Elevator Medium Prime
1205 Monthly Transactions II Medium Prime
1206 Design Skiplist Hard Normal
1207 Unique Number of Occurrences Easy Normal
1208 Get Equal Substrings Within Budget Medium Normal
1209 Remove All Adjacent Duplicates in String II Medium Normal
1210 Minimum Moves to Reach Target with Rotations Hard Normal
1211 Queries Quality and Percentage Easy Prime
1212 Team Scores in Football Tournament Medium Prime
1213 Intersection of Three Sorted Arrays Easy Prime
1214 Two Sum BSTs Medium Prime
1215 Stepping Numbers Medium Prime
1216 Valid Palindrome III Hard Prime
1217 Play with Chips Easy Normal
1218 Longest Arithmetic Subsequence of Given Difference Medium Normal
1219 Path with Maximum Gold Medium Normal
1220 Count Vowels Permutation Hard Normal
1221 Split a String in Balanced Strings Easy Normal
1222 Queens That Can Attack the King Medium Normal
1223 Dice Roll Simulation Medium Normal
1224 Maximum Equal Frequency Hard Normal
1225 Report Contiguous Dates Hard Prime
1226 The Dining Philosophers Medium Normal
1227 Airplane Seat Assignment Probability Medium Normal
1228 Missing Number In Arithmetic Progression Easy Prime
1229 Meeting Scheduler Medium Prime
1230 Toss Strange Coins Medium Prime
1231 Divide Chocolate Hard Prime
1232 Check If It Is a Straight Line Easy Normal
1233 Remove Sub-Folders from the Filesystem Medium Normal
1234 Replace the Substring for Balanced String Medium Normal
1235 Maximum Profit in Job Scheduling Hard Normal
1236 Web Crawler Medium Prime
1237 Find Positive Integer Solution for a Given Equation Easy Normal
1238 Circular Permutation in Binary Representation Medium Normal
1239 Maximum Length of a Concatenated String with Unique Characters Medium Normal
1240 Tiling a Rectangle with the Fewest Squares Hard Normal
1241 Number of Comments per Post Easy Prime
1242 Web Crawler Multithreaded Medium Prime
1243 Array Transformation Easy Prime
1244 Design A Leaderboard Medium Prime
1245 Tree Diameter Medium Prime
1246 Palindrome Removal Hard Prime
1247 Minimum Swaps to Make Strings Equal Medium Normal
1248 Count Number of Nice Subarrays Medium Normal
1249 Minimum Remove to Make Valid Parentheses Medium Normal
1250 Check If It Is a Good Array Hard Normal
1251 Average Selling Price Easy Prime
1252 Cells with Odd Values in a Matrix Easy Normal
1253 Reconstruct a 2-Row Binary Matrix Medium Normal
1254 Number of Closed Islands Medium Normal
1255 Maximum Score Words Formed by Letters Hard Normal
1256 Encode Number Medium Prime
1257 Smallest Common Region Medium Prime
1258 Synonymous Sentences Medium Prime
1259 Handshakes That Don't Cross Hard Prime
1260 Shift 2D Grid Easy Normal
1261 Find Elements in a Contaminated Binary Tree Medium Normal
1262 Greatest Sum Divisible by Three Medium Normal
1263 Minimum Moves to Move a Box to Their Target Location Hard Normal
1264 Page Recommendations Medium Prime
1265 Print Immutable Linked List in Reverse Medium Prime
1266 Minimum Time Visiting All Points Easy Normal
1267 Count Servers that Communicate Medium Normal
1268 Search Suggestions System Medium Normal
1269 Number of Ways to Stay in the Same Place After Some Steps Hard Normal
1270 All People Report to the Given Manager Medium Prime
1271 Hexspeak Easy Prime
1272 Remove Interval Medium Prime
1273 Delete Tree Nodes Medium Prime
1274 Number of Ships in a Rectangle Hard Prime
1275 Find Winner on a Tic Tac Toe Game Easy Normal
1276 Number of Burgers with No Waste of Ingredients Medium Normal
1277 Count Square Submatrices with All Ones Medium Normal
1278 Palindrome Partitioning III Hard Normal
1279 Traffic Light Controlled Intersection Easy Prime
1280 Students and Examinations Easy Prime
1281 Subtract the Product and Sum of Digits of an Integer Easy Normal
1282 Group the People Given the Group Size They Belong To Medium Normal
1283 Find the Smallest Divisor Given a Threshold Medium Normal
1284 Minimum Number of Flips to Convert Binary Matrix to Zero Matrix Hard Normal
1285 Find the Start and End Number of Continuous Ranges Medium Prime
1286 Iterator for Combination Medium Normal
1287 Element Appearing More Than 25% In Sorted Array Easy Normal
1288 Remove Covered Intervals Medium Normal
1289 Minimum Falling Path Sum II Hard Normal
1290 Convert Binary Number in a Linked List to Integer Easy Normal
1291 Sequential Digits Medium Normal
1292 Maximum Side Length of a Square with Sum Less than or Equal to Threshold Medium Normal
1293 Shortest Path in a Grid with Obstacles Elimination Hard Normal
1294 Weather Type in Each Country Easy Prime
1295 Find Numbers with Even Number of Digits Easy Normal
1296 Divide Array in Sets of K Consecutive Numbers Medium Normal
1297 Maximum Number of Occurrences of a Substring Medium Normal
1298 Maximum Candies You Can Get from Boxes Hard Normal
1299 Replace Elements with Greatest Element on Right Side Easy Normal
1300 Sum of Mutated Array Closest to Target Medium Normal
1301 Number of Paths with Max Score Hard Normal
1302 Deepest Leaves Sum Medium Normal
1303 Find the Team Size Easy Prime
1304 Find N Unique Integers Sum up to Zero Easy Normal
1305 All Elements in Two Binary Search Trees Medium Normal
1306 Jump Game III Medium Normal
1307 Verbal Arithmetic Puzzle Hard Normal
1308 Running Total for Different Genders Medium Prime
1309 Decrypt String from Alphabet to Integer Mapping Easy Normal
1310 XOR Queries of a Subarray Medium Normal
1311 Get Watched Videos by Your Friends Medium Normal
1312 Minimum Insertion Steps to Make a String Palindrome Hard Normal
1313 Decompress Run-Length Encoded List Easy Normal
1314 Matrix Block Sum Medium Normal
1315 Sum of Nodes with Even-Valued Grandparent Medium Normal
1316 Distinct Echo Substrings Hard Normal
1317 Convert Integer to the Sum of Two No-Zero Integers Easy Normal
1318 Minimum Flips to Make a OR b Equal to c Medium Normal
1319 Number of Operations to Make Network Connected Medium Normal
1320 Minimum Distance to Type a Word Using Two Fingers Hard Normal
1321 Restaurant Growth Medium Prime
1322 1322. Ads Performance Easy Prime
1323 1323. Maximum 69 Number Easy Normal
1324 1324. Print Words Vertically Medium Normal
1325 1325. Delete Leaves With a Given Value Medium Normal
1326 1326. Minimum Number of Taps to Open to Water a Garden Hard Normal
1327 List the Products Ordered in a Period Easy Prime
1328 Break a Palindrome Medium Normal
1329 Sort the Matrix Diagonally Medium Normal
1330 Reverse Subarray To Maximize Array Value Hard Normal
1331 Rank Transform of an Array Easy Normal
1332 Remove Palindromic Subsequences Easy Normal
1333 Filter Restaurants by Vegan-Friendly, Price and Distance Medium Normal
1334 Find the City With the Smallest Number of Neighbors at a Threshold Distance Medium Normal
1335 Minimum Difficulty of a Job Schedule Hard Normal
1336 Number of Transactions per Visit Hard Prime
1337 The K Weakest Rows in a Matrix Easy Normal
1338 Reduce Array Size to The Half Medium Normal
1339 Maximum Product of Splitted Binary Tree Medium Normal
1340 Jump Game V Hard Normal
1341 Movie Rating Medium Prime
1342 Number of Steps to Reduce a Number to Zero Easy Normal
1343 Number of Sub-arrays of Size K and Average Greater than or Equal to Threshold Medium Normal
1344 Angle Between Hands of a Clock Medium Normal
1345 Jump Game IV Hard Normal
1346 Check If N and Its Double Exist Easy Normal
1347 Minimum Number of Steps to Make Two Strings Anagram Medium Normal
1348 Tweet Counts Per Frequency Medium Normal
1349 Maximum Students Taking Exam Hard Normal
1350 Students With Invalid Departments Easy Prime
1351 Count Negative Numbers in a Sorted Matrix Easy Normal
1352 Product of the Last K Numbers Medium Normal
1353 Maximum Number of Events That Can Be Attended Medium Normal
1354 Construct Target Array With Multiple Sums Hard Normal
1355 Activity Participants Medium Prime
1356 Sort Integers by The Number of 1 Bits Easy Normal
1357 Apply Discount Every n Orders Medium Normal
1358 Number of Substrings Containing All Three Characters Medium Normal
1359 Count All Valid Pickup and Delivery Options Hard Normal
1360 Number of Days Between Two Dates Easy Normal
1361 Validate Binary Tree Nodes Medium Normal
1362 Closest Divisors Medium Normal
1363 Largest Multiple of Three Hard Normal
1364 Number of Trusted Contacts of a Customer Medium Prime
1365 How Many Numbers Are Smaller Than the Current Number Easy Normal
1366 Rank Teams by Votes Medium Normal
1367 Linked List in Binary Tree Medium Normal
1368 Minimum Cost to Make at Least One Valid Path in a Grid Hard Normal
1369 Get the Second Most Recent Activity Hard Prime
1370 Increasing Decreasing String Easy Normal
1371 Find the Longest Substring Containing Vowels in Even Counts Medium Normal
1372 Longest ZigZag Path in a Binary Tree Medium Normal
1373 Maximum Sum BST in Binary Tree Hard Normal
1374 Generate a String With Characters That Have Odd Counts Easy Normal
1375 Bulb Switcher III Medium Normal
1376 Time Needed to Inform All Employees Medium Normal
1377 Frog Position After T Seconds Hard Normal
1378 Replace Employee ID With The Unique Identifier Easy Prime
1379 Find a Corresponding Node of a Binary Tree in a Clone of That Tree Medium Normal
1380 Lucky Numbers in a Matrix Easy Normal
1381 Design a Stack With Increment Operation Medium Normal
1382 Balance a Binary Search Tree Medium Normal
1383 Maximum Performance of a Team Hard Normal
1384 Total Sales Amount by Year Hard Prime
1385 Find the Distance Value Between Two Arrays Easy Normal
1386 Cinema Seat Allocation Medium Normal
1387 Sort Integers by The Power Value Medium Normal
1388 Pizza With 3n Slices Hard Normal
1389 Create Target Array in the Given Order Easy Normal
1390 Four Divisors Medium Normal
1391 Check if There is a Valid Path in a Grid Medium Normal
1392 Longest Happy Prefix Hard Normal
1393 Capital Gain/Loss Medium Prime
1394 Find Lucky Integer in an Array Easy Normal
1395 Count Number of Teams Medium Normal
1396 Design Underground System Medium Normal
1397 Find All Good Strings Hard Normal
1398 Customers Who Bought Products A and B but Not C Medium Prime
1399 Count Largest Group Easy Normal
1400 Construct K Palindrome Strings Medium Normal
1401 Circle and Rectangle Overlapping Medium Normal
1402 Reducing Dishes Hard Normal
1403 Minimum Subsequence in Non-Increasing Order Easy Normal
1404 Number of Steps to Reduce a Number in Binary Representation to One Medium Normal
1405 Longest Happy String Medium Normal
1406 Stone Game III Hard Normal
1407 Top Travellers Easy Prime
1408 String Matching in an Array Easy Normal
1409 Queries on a Permutation With Key Medium Normal
1410 HTML Entity Parser Medium Normal
1411 Number of Ways to Paint N × 3 Grid Hard Normal
1412 Find the Quiet Students in All Exams Hard Prime
1413 Minimum Value to Get Positive Step by Step Sum Easy Normal
1414 Find the Minimum Number of Fibonacci Numbers Whose Sum Is K Medium Normal
1415 The k-th Lexicographical String of All Happy Strings of Length n Medium Normal
1416 Restore The Array Hard Normal
1417 Reformat The String Easy Normal
1418 Display Table of Food Orders in a Restaurant Medium Normal
1419 Minimum Number of Frogs Croaking Medium Normal
1420 Build Array Where You Can Find The Maximum Exactly K Comparisons Hard Normal
1421 NPV Queries Medium Prime
1422 Maximum Score After Splitting a String Easy Normal
1423 Maximum Points You Can Obtain from Cards Medium Normal
1424 Diagonal Traverse II Medium Normal
1425 Constrained Subset Sum Hard Normal
1426 Counting Elements Easy Prime
1427 Perform String Shifts Easy Prime
1428 Leftmost Column with at Least a One Medium Prime
1429 First Unique Number Medium Prime
1430 Check If a String Is a Valid Sequence from Root to Leaves Path in a Binary Tree Medium Prime
1431 Kids With the Greatest Number of Candies Easy Normal
1432 Max Difference You Can Get From Changing an Integer Medium Normal
1433 Check If a String Can Break Another String Medium Normal
1434 Number of Ways to Wear Different Hats to Each Other Hard Normal
1435 Create a Session Bar Chart Easy Prime
1436 Destination City Easy Normal
1437 Check If All 1's Are at Least Length K Places Away Medium Normal
1438 Longest Continuous Subarray With Absolute Diff Less Than or Equal to Limit Medium Normal
1439 Find the Kth Smallest Sum of a Matrix With Sorted Rows Hard Normal
1440 Evaluate Boolean Expression Medium Prime
1441 Build an Array With Stack Operations Easy Normal
1442 Count Triplets That Can Form Two Arrays of Equal XOR Medium Normal
1443 Minimum Time to Collect All Apples in a Tree Medium Normal
1444 Number of Ways of Cutting a Pizza Hard Normal
1445 Apples & Oranges Medium Prime
1446 Consecutive Characters Easy Normal
1447 Simplified Fractions Medium Normal
1448 Count Good Nodes in Binary Tree Medium Normal
1449 Form Largest Integer With Digits That Add up to Target Hard Normal
1450 Number of Students Doing Homework at a Given Time Easy Normal
1451 Rearrange Words in a Sentence Medium Normal
1452 People Whose List of Favorite Companies Is Not a Subset of Another List Medium Normal
1453 Maximum Number of Darts Inside of a Circular Dartboard Hard Normal
1454 Active Users Medium Prime
1455 Check If a Word Occurs As a Prefix of Any Word in a Sentence Easy Normal
1456 Maximum Number of Vowels in a Substring of Given Length Medium Normal
1457 Pseudo-Palindromic Paths in a Binary Tree Medium Normal
1458 Max Dot Product of Two Subsequences Hard Normal
1459 Rectangles Area Medium Prime
1460 Make Two Arrays Equal by Reversing Sub-arrays Easy Normal
1461 Check If a String Contains All Binary Codes of Size K Medium Normal
1462 Course Schedule IV Medium Normal
1463 Cherry Pickup II Hard Normal
1464 Maximum Product of Two Elements in an Array Easy Normal
1465 Maximum Area of a Piece of Cake After Horizontal and Vertical Cuts Medium Normal
1466 Reorder Routes to Make All Paths Lead to the City Zero Medium Normal
1467 Probability of a Two Boxes Having The Same Number of Distinct Balls Hard Normal
1468 Calculate Salaries Medium Prime
1469 Find All the Lonely Nodes Easy Prime
1470 Shuffle the Array Easy Normal
1471 The k Strongest Values in an Array Medium Normal
1472 Design Browser History Medium Normal
1473 Paint House III Hard Normal
1474 Delete N Nodes After M Nodes of a Linked List Easy Prime
1475 Final Prices With a Special Discount in a Shop Easy Normal
1476 Subrectangle Queries Medium Normal
1477 Find Two Non-overlapping Sub-arrays Each With Target Sum Medium Normal
1478 Allocate Mailboxes Hard Normal
1479 Sales by Day of the Week Hard Prime
1480 Running Sum of 1d Array Easy Normal
1481 Least Number of Unique Integers after K Removals Medium Normal
1482 Minimum Number of Days to Make m Bouquets Medium Normal
1483 Kth Ancestor of a Tree Node Hard Normal
1484 Group Sold Products By The Date Easy Prime
1485 Clone Binary Tree With Random Pointer Medium Prime
1486 XOR Operation in an Array Easy Normal
1487 Making File Names Unique Medium Normal
1488 Avoid Flood in The City Medium Normal
1489 Find Critical and Pseudo-Critical Edges in Minimum Spanning Tree Hard Normal
1490 Clone N-ary Tree Medium Prime
1491 Average Salary Excluding the Minimum and Maximum Salary Easy Normal
1492 The kth Factor of n Medium Normal
1493 Longest Subarray of 1's After Deleting One Element Medium Normal
1494 Parallel Courses II Hard Normal
1495 Friendly Movies Streamed Last Month Easy Prime
1496 Path Crossing Easy Normal
1497 Check If Array Pairs Are Divisible by k Medium Normal
1498 Number of Subsequences That Satisfy the Given Sum Condition Medium Normal
1499 Max Value of Equation Hard Normal
1500 Design a File Sharing System Medium Prime
1501 Countries You Can Safely Invest In Medium Prime
1502 Can Make Arithmetic Progression From Sequence Easy Normal
1503 Last Moment Before All Ants Fall Out of a Plank Medium Normal
1504 Count Submatrices With All Ones Medium Normal
1505 Minimum Possible Integer After at Most K Adjacent Swaps On Digits Hard Normal
1506 Find Root of N-Ary Tree Medium Prime
1507 Reformat Date Easy Normal
1508 Range Sum of Sorted Subarray Sums Medium Normal
1509 Minimum Difference Between Largest and Smallest Value in Three Moves Medium Normal
1510 Stone Game IV Hard Normal
1511 Customer Order Frequency Easy Prime
1512 Number of Good Pairs Easy Normal
1513 Number of Substrings With Only 1s Medium Normal
1514 Path with Maximum Probability Medium Normal
1515 Best Position for a Service Centre Hard Normal
1516 Move Sub-Tree of N-Ary Tree Hard Prime
1517 Find Users With Valid E-Mails Easy Prime
1518 Water Bottles Easy Normal
1519 Number of Nodes in the Sub-Tree With the Same Label Medium Normal
1520 Maximum Number of Non-Overlapping Substrings Hard Normal
1521 Find a Value of a Mysterious Function Closest to Target Hard Normal
1522 Diameter of N-Ary Tree Medium Prime
1523 Count Odd Numbers in an Interval Range Easy Normal
1524 Number of Sub-arrays With Odd Sum Medium Normal
1525 Number of Good Ways to Split a String Medium Normal
1526 Minimum Number of Increments on Subarrays to Form a Target Array Hard Normal
1527 Patients With a Condition Easy Prime
1528 Shuffle String Easy Normal
1529 Bulb Switcher IV Medium Normal
1530 Number of Good Leaf Nodes Pairs Medium Normal
1531 String Compression II Hard Normal
1532 The Most Recent Three Orders Medium Prime
1533 Find the Index of the Large Integer Medium Prime
1534 Count Good Triplets Easy Normal
1535 Find the Winner of an Array Game Medium Normal
1536 Minimum Swaps to Arrange a Binary Grid Medium Normal
1537 Get the Maximum Score Hard Normal
1538 Guess the Majority in a Hidden Array Medium Prime
1539 Kth Missing Positive Number Easy Normal
1540 Can Convert String in K Moves Medium Normal
1541 Minimum Insertions to Balance a Parentheses String Medium Normal
1542 Find Longest Awesome Substring Hard Normal
1543 Fix Product Name Format Easy Prime
1544 Make The String Great Easy Normal
1545 Find Kth Bit in Nth Binary String Medium Normal
1546 Maximum Number of Non-Overlapping Subarrays With Sum Equals Target Medium Normal
1547 Minimum Cost to Cut a Stick Hard Normal
1548 The Most Similar Path in a Graph Hard Prime
1549 The Most Recent Orders for Each Product Medium Prime
1550 Three Consecutive Odds Easy Normal
1551 Minimum Operations to Make Array Equal Medium Normal
1552 Magnetic Force Between Two Balls Medium Normal
1553 Minimum Number of Days to Eat N Oranges Hard Normal
1554 Strings Differ by One Character Medium Prime
1555 Bank Account Summary Medium Prime
1556 Thousand Separator Easy Normal
1557 Minimum Number of Vertices to Reach All Nodes Medium Normal
1558 Minimum Numbers of Function Calls to Make Target Array Medium Normal
1559 Detect Cycles in 2D Grid Hard Normal
1560 Most Visited Sector in a Circular Track Easy Normal
1561 Maximum Number of Coins You Can Get Medium Normal
1562 Find Latest Group of Size M Medium Normal
1563 Stone Game V Hard Normal
1564 Put Boxes Into the Warehouse I Medium Prime
1565 Unique Orders and Customers Per Month Easy Prime
1566 Detect Pattern of Length M Repeated K or More Times Easy Normal
1567 Maximum Length of Subarray With Positive Product Medium Normal
1568 Minimum Number of Days to Disconnect Island Medium Normal
1569 Number of Ways to Reorder Array to Get Same BST Hard Normal
1570 Dot Product of Two Sparse Vectors Medium Prime
1571 Warehouse Manager Easy Prime
1572 Matrix Diagonal Sum Easy Normal
1573 Number of Ways to Split a String Medium Normal
1574 Shortest Subarray to be Removed to Make Array Sorted Medium Normal
1575 Count All Possible Routes Hard Normal
1576 Replace All ?'s to Avoid Consecutive Repeating Characters Easy Normal
1577 Number of Ways Where Square of Number Is Equal to Product of Two Numbers Medium Normal
1578 Minimum Deletion Cost to Avoid Repeating Letters Medium Normal
1579 Remove Max Number of Edges to Keep Graph Fully Traversable Hard Normal
1580 Put Boxes Into the Warehouse II Medium Prime
1581 Customer Who Visited but Did Not Make Any Transactions Easy Prime
1582 Special Positions in a Binary Matrix Easy Normal
1583 Count Unhappy Friends Medium Normal
1584 Min Cost to Connect All Points Medium Normal
1585 Check If String Is Transformable With Substring Sort Operations Hard Normal
1586 Binary Search Tree Iterator II Medium Prime
1587 Bank Account Summary II Easy Prime
1588 Sum of All Odd Length Subarrays Easy Normal
1589 Maximum Sum Obtained of Any Permutation Medium Normal
1590 Make Sum Divisible by P Medium Normal
1591 Strange Printer II Hard Normal
1592 Rearrange Spaces Between Words Easy Normal
1593 Split a String Into the Max Number of Unique Substrings Medium Normal
1594 Maximum Non Negative Product in a Matrix Medium Normal
1595 Minimum Cost to Connect Two Groups of Points Hard Normal
1596 The Most Frequently Ordered Products for Each Customer Medium Prime
1597 Build Binary Expression Tree From Infix Expression Medium Prime
1598 Crawler Log Folder Easy Normal
1599 Maximum Profit of Operating a Centennial Wheel Medium Normal
1600 Throne Inheritance Medium Normal
1601 Maximum Number of Achievable Transfer Requests Hard Normal
1602 Find Nearest Right Node in Binary Tree Medium Prime
1603 Design Parking System Easy Normal
1604 Alert Using Same Key-Card Three or More Times in a One Hour Period Medium Normal
1605 Find Valid Matrix Given Row and Column Sums Medium Normal
1606 Find Servers That Handled Most Number of Requests Hard Normal
1607 Sellers With No Sales Easy Prime
1608 Special Array With X Elements Greater Than or Equal X Easy Normal
1609 Even Odd Tree Medium Normal
1610 Maximum Number of Visible Points Medium Normal
1611 Minimum One Bit Operations to Make Integers Zero Hard Normal
1612 Check If Two Expression Trees are Equivalent Medium Prime
1613 Find the Missing IDs Medium Prime
1614 Maximum Nesting Depth of the Parentheses Easy Normal
1615 Maximal Network Rank Medium Normal
1616 Split Two Strings to Make Palindrome Medium Normal
1617 Count Subtrees With Max Distance Between Cities Hard Normal
1618 Maximum Font to Fit a Sentence in a Screen Medium Prime
1619 Mean of Array After Removing Some Elements Easy Normal
1620 Coordinate With Maximum Network Quality Medium Normal
1621 Number of Sets of K Non-Overlapping Line Segments Medium Normal
1622 Fancy Sequence Hard Normal
1623 All Valid Triplets That Can Represent a Country Easy Prime
1624 Largest Substring Between Two Equal Characters Easy Normal
1625 Lexicographically Smallest String After Applying Operations Medium Normal
1626 Best Team With No Conflicts Medium Normal
1627 Graph Connectivity With Threshold Hard Normal
1628 Design an Expression Tree With Evaluate Function Medium Prime
1629 Slowest Key Easy Normal
1630 Arithmetic Subarrays Medium Normal
1631 Path With Minimum Effort Medium Normal
1632 Rank Transform of a Matrix Hard Normal
1633 Percentage of Users Attended a Contest Easy Prime
1634 Add Two Polynomials Represented as Linked Lists Medium Prime
1635 Hopper Company Queries I Hard Prime
1636 Sort Array by Increasing Frequency Easy Normal
1637 Widest Vertical Area Between Two Points Containing No Points Medium Normal
1638 Count Substrings That Differ by One Character Medium Normal
1639 Number of Ways to Form a Target String Given a Dictionary Hard Normal
1640 Check Array Formation Through Concatenation Easy Normal
1641 Count Sorted Vowel Strings Medium Normal
1642 Furthest Building You Can Reach Medium Normal
1643 Kth Smallest Instructions Hard Normal
1644 Lowest Common Ancestor of a Binary Tree II Medium Prime
1645 Hopper Company Queries II Hard Prime
1646 Get Maximum in Generated Array Easy Normal
1647 Minimum Deletions to Make Character Frequencies Unique Medium Normal
1648 Sell Diminishing-Valued Colored Balls Medium Normal
1649 Create Sorted Array through Instructions Hard Normal
1650 Lowest Common Ancestor of a Binary Tree III Medium Prime
1651 Hopper Company Queries III Hard Prime
1652 Defuse the Bomb Easy Normal
1653 Minimum Deletions to Make String Balanced Medium Normal
1654 Minimum Jumps to Reach Home Medium Normal
1655 Distribute Repeating Integers Hard Normal
1656 Design an Ordered Stream Easy Normal
1657 Determine if Two Strings Are Close Medium Normal
1658 Minimum Operations to Reduce X to Zero Medium Normal
1659 Maximize Grid Happiness Hard Normal
1660 Correct a Binary Tree Medium Prime
1661 Average Time of Process per Machine Easy Prime
1662 Check If Two String Arrays are Equivalent Easy Normal
1663 Smallest String With A Given Numeric Value Medium Normal
1664 Ways to Make a Fair Array Medium Normal
1665 Minimum Initial Energy to Finish Tasks Hard Normal
1666 Change the Root of a Binary Tree Medium Prime
1667 Fix Names in a Table Easy Prime
1668 Maximum Repeating Substring Easy Normal
1669 Merge In Between Linked Lists Medium Normal
1670 Design Front Middle Back Queue Medium Normal
1671 Minimum Number of Removals to Make Mountain Array Hard Normal
1672 Richest Customer Wealth Easy Normal
1673 Find the Most Competitive Subsequence Medium Normal
1674 Minimum Moves to Make Array Complementary Medium Normal
1675 Minimize Deviation in Array Hard Normal
1676 Lowest Common Ancestor of a Binary Tree IV Medium Prime
1677 Product's Worth Over Invoices Easy Prime
1678 Goal Parser Interpretation Easy Normal
1679 Max Number of K-Sum Pairs Medium Normal
1680 Concatenation of Consecutive Binary Numbers Medium Normal
1681 Minimum Incompatibility Hard Normal
1682 Longest Palindromic Subsequence II Medium Prime
1683 Invalid Tweets Easy Prime
1684 Count the Number of Consistent Strings Easy Normal
1685 Sum of Absolute Differences in a Sorted Array Medium Normal
1686 Stone Game VI Medium Normal
1687 Delivering Boxes from Storage to Ports Hard Normal
1688 Count of Matches in Tournament Easy Normal
1689 Partitioning Into Minimum Number Of Deci-Binary Numbers Medium Normal
1690 Stone Game VII Medium Normal
1691 Maximum Height by Stacking Cuboids Hard Normal
1692 Count Ways to Distribute Candies Hard Prime
1693 Daily Leads and Partners Easy Prime
1694 Reformat Phone Number Easy Normal
1695 Maximum Erasure Value Medium Normal
1696 Jump Game VI Medium Normal
1697 Checking Existence of Edge Length Limited Paths Hard Normal
1698 Number of Distinct Substrings in a String Medium Prime
1699 Number of Calls Between Two Persons Medium Prime
1700 Number of Students Unable to Eat Lunch Easy Normal
1701 Average Waiting Time Medium Normal
1702 Maximum Binary String After Change Medium Normal
1703 Minimum Adjacent Swaps for K Consecutive Ones Hard Normal
1704 Determine if String Halves Are Alike Easy Normal
1705 Maximum Number of Eaten Apples Medium Normal
1706 Where Will the Ball Fall Medium Normal
1707 Maximum XOR With an Element From Array Hard Normal
1708 Largest Subarray Length K Easy Prime
1709 Biggest Window Between Visits Medium Prime
1710 Maximum Units on a Truck Easy Normal
1711 Count Good Meals Medium Normal
1712 Ways to Split Array Into Three Subarrays Medium Normal
1713 Minimum Operations to Make a Subsequence Hard Normal
1714 Sum Of Special Evenly-Spaced Elements In Array Hard Prime
1715 Count Apples and Oranges Medium Prime
1716 Calculate Money in Leetcode Bank Easy Normal
1717 Maximum Score From Removing Substrings Medium Normal
1718 Construct the Lexicographically Largest Valid Sequence Medium Normal
1719 Number Of Ways To Reconstruct A Tree Hard Normal
1720 Decode XORed Array Easy Normal
1721 Swapping Nodes in a Linked List Hard Normal
1722 Minimize Hamming Distance After Swap Operations Medium Normal
1723 Find Minimum Time to Finish All Jobs Hard Normal
1724 Checking Existence of Edge Length Limited Paths II Hard Prime
1725 Number Of Rectangles That Can Form The Largest Square Easy Normal
1726 Tuple with Same Product Medium Normal
1727 Largest Submatrix With Rearrangements Medium Normal
1728 Cat and Mouse II Hard Normal
1729 Find Followers Count Easy Prime
1730 Shortest Path to Get Food Medium Prime
1731 The Number of Employees Which Report to Each Employee Easy Prime
1732 Find the Highest Altitude Easy Normal
1733 Minimum Number of People to Teach Medium Normal
1734 Decode XORed Permutation Medium Normal
1735 Count Ways to Make Array With Product Hard Normal
1736 Latest Time by Replacing Hidden Digits Easy Normal
1737 Change Minimum Characters to Satisfy One of Three Conditions Medium Normal
1738 Find Kth Largest XOR Coordinate Value Medium Normal
1739 Building Boxes Hard Normal
1740 Find Distance in a Binary Tree Medium Prime
1741 Find Total Time Spent by Each Employee Easy Prime
1742 Maximum Number of Balls in a Box Easy Normal
1743 Restore the Array From Adjacent Pairs Medium Normal
1744 Can You Eat Your Favorite Candy on Your Favorite Day? Medium Normal
1745 Palindrome Partitioning IV Hard Normal
1746 Maximum Subarray Sum After One Operation Medium Prime
1747 Leetflex Banned Accounts Medium Prime
1748 Sum of Unique Elements Easy Normal
1749 Maximum Absolute Sum of Any Subarray Medium Normal
1750 Minimum Length of String After Deleting Similar Ends Medium Normal
1751 Maximum Number of Events That Can Be Attended II Hard Normal
1752 Check if Array Is Sorted and Rotated Easy Normal
1753 Maximum Score From Removing Stones Medium Normal
1754 Largest Merge Of Two Strings Medium Normal
1755 Closest Subsequence Sum Hard Normal
1756 Design Most Recently Used Queue Medium Prime
1757 Recyclable and Low Fat Products Easy Prime
1758 Minimum Changes To Make Alternating Binary String Easy Normal
1759 Count Number of Homogenous Substrings Medium Normal
1760 Minimum Limit of Balls in a Bag Medium Normal
1761 Minimum Degree of a Connected Trio in a Graph Hard Normal
1762 Buildings With an Ocean View Medium Prime
1763 Longest Nice Substring Easy Normal
1764 Form Array by Concatenating Subarrays of Another Array Medium Normal
1765 Map of Highest Peak Medium Normal
1766 Tree of Coprimes Hard Normal
1767 Find the Subtasks That Did Not Execute Hard Prime
1768 Merge Strings Alternately Easy Normal
1769 Minimum Number of Operations to Move All Balls to Each Box Medium Normal
1770 Maximum Score from Performing Multiplication Operations Medium Normal
1771 Maximize Palindrome Length From Subsequences Hard Normal
1772 Sort Features by Popularity Medium Prime
1773 Count Items Matching a Rule Easy Normal
1774 Closest Dessert Cost Medium Normal
1775 Equal Sum Arrays With Minimum Number of Operations Medium Normal
1776 Car Fleet II Hard Normal
1777 Product's Price for Each Store Easy Prime
1778 Shortest Path in a Hidden Grid Medium Prime
1779 Find Nearest Point That Has the Same X or Y Coordinate Easy Normal
1780 Check if Number is a Sum of Powers of Three Medium Normal
1781 Sum of Beauty of All Substrings Medium Normal
1782 Count Pairs Of Nodes Hard Normal
1783 Grand Slam Titles Medium Prime
1784 Check if Binary String Has at Most One Segment of Ones Easy Normal
1785 Minimum Elements to Add to Form a Given Sum Medium Normal
1786 Number of Restricted Paths From First to Last Node Medium Normal
1787 Make the XOR of All Segments Equal to Zero Hard Normal
1788 Maximize the Beauty of the Garden Hard Prime
1789 Primary Department for Each Employee Easy Prime
1790 Check if One String Swap Can Make Strings Equal Easy Normal
1791 Find Center of Star Graph Medium Normal
1792 Maximum Average Pass Ratio Medium Normal
1793 Maximum Score of a Good Subarray Hard Normal
1794 Count Pairs of Equal Substrings With Minimum Difference Medium Prime
1795 Rearrange Products Table Easy Prime
1796 Second Largest Digit in a String Easy Normal
1797 Design Authentication Manager Medium Normal
1798 Maximum Number of Consecutive Values You Can Make Medium Normal
1799 Maximize Score After N Operations Hard Normal
1800 Maximum Ascending Subarray Sum Easy Normal
1801 Number of Orders in the Backlog Medium Normal
1802 Maximum Value at a Given Index in a Bounded Array Medium Normal
1803 Count Pairs With XOR in a Range Hard Normal
1804 Implement Trie II (Prefix Tree) Medium Prime
1805 Number of Different Integers in a String Easy Normal
1806 Minimum Number of Operations to Reinitialize a Permutation Medium Normal
1807 Evaluate the Bracket Pairs of a String Medium Normal
1808 Maximize Number of Nice Divisors Hard Normal
1809 Ad-Free Sessions Easy Prime
1810 Minimum Path Cost in a Hidden Grid Medium Prime
1811 Find Interview Candidates Medium Prime
1812 Determine Color of a Chessboard Square Easy Normal
1813 Sentence Similarity III Medium Normal
1814 Count Nice Pairs in an Array Medium Normal
1815 Maximum Number of Groups Getting Fresh Donuts Hard Normal
1816 Truncate Sentence Easy Normal
1817 Finding the Users Active Minutes Medium Normal
1818 Minimum Absolute Sum Difference Medium Normal
1819 Number of Different Subsequences GCDs Hard Normal
1820 Maximum Number of Accepted Invitations Medium Prime
1821 Find Customers With Positive Revenue this Year Easy Prime
1822 Sign of the Product of an Array Easy Normal
1823 Find the Winner of the Circular Game Medium Normal
1824 Minimum Sideway Jumps Medium Normal
1825 Finding MK Average Hard Normal
1826 Faulty Sensor Easy Prime
1827 Minimum Operations to Make the Array Increasing Easy Normal
1828 Queries on Number of Points Inside a Circle Medium Normal
1829 Maximum XOR for Each Query Medium Normal
1830 Minimum Number of Operations to Make String Sorted Hard Normal
1831 Maximum Transaction Each Day Medium Prime
1832 Check if the Sentence Is Pangram Easy Normal
1833 Maximum Ice Cream Bars Medium Normal
1834 Single-Threaded CPU Medium Normal
1835 Find XOR Sum of All Pairs Bitwise AND Hard Normal
1836 Remove Duplicates From an Unsorted Linked List Medium Prime
1837 Sum of Digits in Base K Easy Normal
1838 Frequency of the Most Frequent Element Medium Normal
1839 Longest Substring Of All Vowels in Order Medium Normal
1840 Maximum Building Height Hard Normal
1841 League Statistics Medium Prime
1842 Next Palindrome Using Same Digits Hard Prime
1843 Suspicious Bank Accounts Medium Prime
1844 Replace All Digits with Characters Easy Normal
1845 Seat Reservation Manager Medium Normal
1846 Maximum Element After Decreasing and Rearranging Medium Normal
1847 Closest Room Hard Normal
1848 Minimum Distance to the Target Element Easy Normal
1849 Splitting a String Into Descending Consecutive Values Medium Normal
1850 Minimum Adjacent Swaps to Reach the Kth Smallest Number Medium Normal
1851 Minimum Interval to Include Each Query Hard Normal
1852 Distinct Numbers in Each Subarray Medium Prime
1853 Convert Date Format Easy Prime
1854 Maximum Population Year Easy Normal
1855 Maximum Distance Between a Pair of Values Medium Normal
1856 Maximum Subarray Min-Product Medium Normal
1857 Largest Color Value in a Directed Graph Hard Normal