LeerCode Question

LeetCode List EN

Updata: 2022.05.18

Id	Question	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	Implement strStr()	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	Pow(x, 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	Sqrt(x)	Easy
70	Climbing Stairs	Easy
71	Simplify Path	Medium
72	Edit Distance	Hard
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	Pascal's Triangle	Easy
119	Pascal's 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	Easy
156	Binary Tree Upside Down	Medium
157	Read N Characters Given Read4	Easy
158	Read N Characters Given read4 II - Call Multiple Times	Hard
159	Longest Substring with At Most Two Distinct Characters	Medium
160	Intersection of Two Linked Lists	Easy
161	One Edit Distance	Medium
162	Find Peak Element	Medium
163	Missing Ranges	Easy
164	Maximum Gap	Hard
165	Compare Version Numbers	Medium
166	Fraction to Recurring Decimal	Medium
167	Two Sum II - Input Array Is Sorted	Medium
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	Medium
177	Nth Highest Salary	Medium
178	Rank Scores	Medium
179	Largest Number	Medium
180	Consecutive Numbers	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	Hard
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	Medium
193	Valid Phone Numbers	Easy
194	Transpose File	Medium
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	Medium
221	Maximal Square	Medium
222	Count Complete Tree Nodes	Medium
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	Easy
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	Hard
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	Easy
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 O(1)	Medium
381	Insert Delete GetRandom O(1) - 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
432	All O`one 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	Easy
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
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
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	Kth Smallest Instructions	Hard
490	The Maze	Medium
491	Increasing 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
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	Inorder Successor in BST II	Medium
510	Count Subarrays With More Ones Than Zeros	Medium
511	All Paths from Source Lead to Destination	Medium
512	Maximum Alternating Subarray Sum	Medium
513	Find Bottom Left Tree Value	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 2	Medium
519	Widest Pair of Indices With Equal Range Sum	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	Swapping Nodes in a Linked List	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
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	Shortest Path to Get Food	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
560	Subarray Sum Equals K	Medium
561	Array Partition I	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
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 More Than 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 Friends	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
623	Add One Row to Tree	Medium
624	Maximum Distance in Arrays	Medium
625	Minimum Factorization	Medium
626	Exchange Seats	Medium
627	Swap Salary	Easy
628	Maximum Product of Three Numbers	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
642	Design Search Autocomplete System	Hard
643	Maximum Average Subarray I	Easy
644	Maximum Average Subarray II	Hard
645	Set Mismatch	Easy
646	Maximum Length of Pair Chain	Medium
647	Palindromic Substrings	Medium
648	Replace Words	Medium
649	Dota2 Senate	Medium
650	2 Keys Keyboard	Medium
651	4 Keys Keyboard	Medium
652	Find Duplicate Subtrees	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	Medium
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
711	Number of Distinct Islands II	Hard
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	Easy
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	To Lower Case	Easy
743	Closest Leaf in a Binary Tree	Medium
744	Network Delay Time	Medium
745	Find Smallest Letter Greater Than Target	Easy
746	Prefix and Suffix Search	Hard
747	Min Cost Climbing Stairs	Easy
748	Largest Number At Least Twice of Others	Easy
749	Shortest Completing Word	Easy
750	Contain Virus	Hard
751	Number Of Corner Rectangles	Medium
752	IP to CIDR	Medium
753	Open the Lock	Medium
754	Cracking the Safe	Hard
755	Reach a Number	Medium
756	Pour Water	Medium
757	Pyramid Transition Matrix	Medium
758	Convert Binary Search Tree to Sorted Doubly Linked List	Medium
759	Set Intersection Size At Least Two	Hard
760	Bold Words in String	Medium
761	Employee Free Time	Hard
762	Find Anagram Mappings	Easy
763	Special Binary String	Hard
764	N-ary Tree Level Order Traversal	Medium
765	Serialize and Deserialize N-ary Tree	Hard
766	Flatten a Multilevel Doubly Linked List	Medium
767	Prime Number of Set Bits in Binary Representation	Easy
768	Partition Labels	Medium
769	Largest Plus Sign	Medium
770	Couples Holding Hands	Hard
771	Encode N-ary Tree to Binary Tree	Hard
772	Construct Quad Tree	Medium
773	Logical OR of Two Binary Grids Represented as Quad-Trees	Medium
774	Maximum Depth of N-ary Tree	Easy
775	N-ary Tree Preorder Traversal	Easy
776	N-ary Tree Postorder Traversal	Easy
777	Toeplitz Matrix	Easy
778	Reorganize String	Medium
779	Max Chunks To Make Sorted II	Hard
780	Max Chunks To Make Sorted	Medium
781	Basic Calculator IV	Hard
782	Jewels and Stones	Easy
783	Search in a Binary Search Tree	Easy
784	Insert into a Binary Search Tree	Medium
785	Basic Calculator III	Hard
786	Search in a Sorted Array of Unknown Size	Medium
787	Sliding Puzzle	Hard
788	Minimize Max Distance to Gas Station	Hard
789	Kth Largest Element in a Stream	Easy
790	Global and Local Inversions	Medium
791	Split BST	Medium
792	Binary Search	Easy
793	Swap Adjacent in LR String	Medium
794	Swim in Rising Water	Hard
795	K-th Symbol in Grammar	Medium
796	Reaching Points	Hard
797	Rabbits in Forest	Medium
798	Transform to Chessboard	Hard
799	Minimum Distance Between BST Nodes	Easy
800	Letter Case Permutation	Medium
801	Is Graph Bipartite?	Medium
802	K-th Smallest Prime Fraction	Hard
803	Cheapest Flights Within K Stops	Medium
804	Rotated Digits	Medium
805	Escape The Ghosts	Medium
806	Domino and Tromino Tiling	Medium
807	Custom Sort String	Medium
808	Number of Matching Subsequences	Medium
809	Preimage Size of Factorial Zeroes Function	Hard
810	Valid Tic-Tac-Toe State	Medium
811	Number of Subarrays with Bounded Maximum	Medium
812	Rotate String	Easy
813	All Paths From Source to Target	Medium
814	Smallest Rotation with Highest Score	Hard
815	Champagne Tower	Medium
816	Design HashSet	Easy
817	Design HashMap	Easy
818	Similar RGB Color	Easy
819	Minimum Swaps To Make Sequences Increasing	Hard
820	Find Eventual Safe States	Medium
821	Bricks Falling When Hit	Hard
822	Unique Morse Code Words	Easy
823	Split Array With Same Average	Hard
824	Number of Lines To Write String	Easy
825	Max Increase to Keep City Skyline	Medium
826	Soup Servings	Medium
827	Expressive Words	Medium
828	Chalkboard XOR Game	Hard
829	Subdomain Visit Count	Medium
830	Largest Triangle Area	Easy
831	Largest Sum of Averages	Medium
832	Binary Tree Pruning	Medium
833	Bus Routes	Hard
834	Ambiguous Coordinates	Medium
835	Linked List Components	Medium
836	Race Car	Hard
837	Most Common Word	Easy
838	Design Linked List	Medium
839	Short Encoding of Words	Medium
841	Shortest Distance to a Character	Easy
842	Card Flipping Game	Medium
843	Binary Trees With Factors	Medium
850	Insert into a Sorted Circular Linked List	Medium
851	Goat Latin	Easy
852	Friends Of Appropriate Ages	Medium
853	Most Profit Assigning Work	Medium
854	Making A Large Island	Hard
855	Count Unique Characters of All Substrings of a Given String	Hard
856	Consecutive Numbers Sum	Hard
857	Positions of Large Groups	Easy
858	Masking Personal Information	Medium
859	Design Circular Deque	Medium
860	Design Circular Queue	Medium
861	Flipping an Image	Easy
862	Find And Replace in String	Medium
863	Sum of Distances in Tree	Hard
864	Image Overlap	Medium
865	Robot Room Cleaner	Hard
866	Rectangle Overlap	Easy
867	New 21 Game	Medium
868	Push Dominoes	Medium
869	Similar String Groups	Hard
870	Magic Squares In Grid	Medium
871	Keys and Rooms	Medium
872	Split Array into Fibonacci Sequence	Medium
873	Guess the Word	Hard
874	Backspace String Compare	Easy
875	Longest Mountain in Array	Medium
876	Hand of Straights	Medium
877	Shortest Path Visiting All Nodes	Hard
878	Shifting Letters	Medium
879	Maximize Distance to Closest Person	Medium
880	Rectangle Area II	Hard
881	Loud and Rich	Medium
882	Peak Index in a Mountain Array	Easy
883	Car Fleet	Medium
884	K-Similar Strings	Hard
885	Exam Room	Medium
886	Score of Parentheses	Medium
887	Minimum Cost to Hire K Workers	Hard
888	Mirror Reflection	Medium
889	Buddy Strings	Easy
890	Lemonade Change	Easy
891	Score After Flipping Matrix	Medium
892	Shortest Subarray with Sum at Least K	Hard
893	All Nodes Distance K in Binary Tree	Medium
894	Random Pick with Blacklist	Hard
895	Shortest Path to Get All Keys	Hard
896	Smallest Subtree with all the Deepest Nodes	Medium
897	Prime Palindrome	Medium
898	Transpose Matrix	Easy
899	Binary Gap	Easy
900	Reordered Power of 2	Medium
901	Advantage Shuffle	Medium
902	Minimum Number of Refueling Stops	Hard
903	Implement Rand10() Using Rand7()	Medium
904	Leaf-Similar Trees	Easy
905	Length of Longest Fibonacci Subsequence	Medium
906	Walking Robot Simulation	Medium
907	Koko Eating Bananas	Medium
908	Middle of the Linked List	Easy
909	Stone Game	Medium
910	Nth Magical Number	Hard
911	Profitable Schemes	Hard
912	Random Pick with Weight	Medium
913	Random Flip Matrix	Medium
914	Random Point in Non-overlapping Rectangles	Medium
915	Generate Random Point in a Circle	Medium
916	Decoded String at Index	Medium
917	Boats to Save People	Medium
918	Reachable Nodes In Subdivided Graph	Hard
919	Projection Area of 3D Shapes	Easy
920	Uncommon Words from Two Sentences	Easy
921	Spiral Matrix III	Medium
922	Possible Bipartition	Medium
923	Super Egg Drop	Hard
924	Fair Candy Swap	Easy
925	Construct Binary Tree from Preorder and Postorder Traversal	Medium
926	Find and Replace Pattern	Medium
927	Sum of Subsequence Widths	Hard
928	Surface Area of 3D Shapes	Easy
929	Groups of Special-Equivalent Strings	Medium
930	All Possible Full Binary Trees	Medium
931	Maximum Frequency Stack	Hard
932	Monotonic Array	Easy
933	Increasing Order Search Tree	Easy
934	Bitwise ORs of Subarrays	Medium
935	Orderly Queue	Hard
936	RLE Iterator	Medium
937	Online Stock Span	Medium
938	Numbers At Most N Given Digit Set	Hard
939	Valid Permutations for DI Sequence	Hard
940	Fruit Into Baskets	Medium
941	Sort Array By Parity	Easy
942	Super Palindromes	Hard
943	Sum of Subarray Minimums	Medium
944	Smallest Range I	Easy
945	Snakes and Ladders	Medium
946	Smallest Range II	Medium
947	Online Election	Medium
948	Sort an Array	Medium
949	Cat and Mouse	Hard
950	X of a Kind in a Deck of Cards	Easy
951	Partition Array into Disjoint Intervals	Medium
952	Word Subsets	Medium
953	Reverse Only Letters	Easy
954	Maximum Sum Circular Subarray	Medium
955	Complete Binary Tree Inserter	Medium
956	Number of Music Playlists	Hard
957	Minimum Add to Make Parentheses Valid	Medium
958	Sort Array By Parity II	Easy
959	3Sum With Multiplicity	Medium
960	Minimize Malware Spread	Hard
961	Long Pressed Name	Easy
962	Flip String to Monotone Increasing	Medium
963	Three Equal Parts	Hard
964	Minimize Malware Spread II	Hard
965	Unique Email Addresses	Easy
966	Binary Subarrays With Sum	Medium
967	Minimum Falling Path Sum	Medium
968	Beautiful Array	Medium
969	Number of Recent Calls	Easy
971	Shortest Bridge	Medium
972	Knight Dialer	Medium
973	Stamping The Sequence	Hard
974	Reorder Data in Log Files	Easy
975	Range Sum of BST	Easy
976	Minimum Area Rectangle	Medium
977	Distinct Subsequences II	Hard
978	Valid Mountain Array	Easy
979	DI String Match	Easy
980	Find the Shortest Superstring	Hard
981	Delete Columns to Make Sorted	Easy
982	Minimum Increment to Make Array Unique	Medium
983	Validate Stack Sequences	Medium
984	Most Stones Removed with Same Row or Column	Medium
985	Bag of Tokens	Medium
986	Largest Time for Given Digits	Medium
987	Reveal Cards In Increasing Order	Medium
988	Flip Equivalent Binary Trees	Medium
989	Largest Component Size by Common Factor	Hard
990	Verifying an Alien Dictionary	Easy
991	Array of Doubled Pairs	Medium
992	Delete Columns to Make Sorted II	Medium
993	Tallest Billboard	Hard
994	Prison Cells After N Days	Medium
998	Check Completeness of a Binary Tree	Medium
999	Regions Cut By Slashes	Medium
1000	Delete Columns to Make Sorted III	Hard
1001	N-Repeated Element in Size 2N Array	Easy
1002	Maximum Width Ramp	Medium
1003	Minimum Area Rectangle II	Medium
1004	Least Operators to Express Number	Hard
1005	Univalued Binary Tree	Easy
1006	Vowel Spellchecker	Medium
1007	Numbers With Same Consecutive Differences	Medium
1008	Binary Tree Cameras	Hard
1009	Pancake Sorting	Medium
1010	Powerful Integers	Medium
1011	Flip Binary Tree To Match Preorder Traversal	Medium
1012	Equal Rational Numbers	Hard
1013	Fibonacci Number	Easy
1014	K Closest Points to Origin	Medium
1016	Subarray Sums Divisible by K	Medium
1017	Odd Even Jump	Hard
1018	Largest Perimeter Triangle	Easy
1019	Squares of a Sorted Array	Easy
1020	Longest Turbulent Subarray	Medium
1021	Distribute Coins in Binary Tree	Medium
1022	Unique Paths III	Hard
1023	Time Based Key-Value Store	Medium
1024	Triples with Bitwise AND Equal To Zero	Hard
1025	Minimum Cost For Tickets	Medium
1026	String Without AAA or BBB	Medium
1027	Sum of Even Numbers After Queries	Medium
1028	Interval List Intersections	Medium
1029	Vertical Order Traversal of a Binary Tree	Hard
1030	Smallest String Starting From Leaf	Medium
1031	Add to Array-Form of Integer	Easy
1032	Satisfiability of Equality Equations	Medium
1033	Broken Calculator	Medium
1034	Subarrays with K Different Integers	Hard
1035	Cousins in Binary Tree	Easy
1036	Rotting Oranges	Medium
1037	Minimum Number of K Consecutive Bit Flips	Hard
1038	Number of Squareful Arrays	Hard
1039	Find the Town Judge	Easy
1040	Maximum Binary Tree II	Medium
1041	Available Captures for Rook	Easy
1042	Minimum Cost to Merge Stones	Hard
1043	Grid Illumination	Hard
1044	Find Common Characters	Easy
1045	Check If Word Is Valid After Substitutions	Medium
1046	Max Consecutive Ones III	Medium
1047	Maximize Sum Of Array After K Negations	Easy
1048	Clumsy Factorial	Medium
1049	Minimum Domino Rotations For Equal Row	Medium
1050	Construct Binary Search Tree from Preorder Traversal	Medium
1051	Shortest Way to Form String	Medium
1052	Campus Bikes	Medium
1053	Minimize Rounding Error to Meet Target	Medium
1054	Complement of Base 10 Integer	Easy
1055	Pairs of Songs With Total Durations Divisible by 60	Medium
1056	Capacity To Ship Packages Within D Days	Medium
1057	Numbers With Repeated Digits	Hard
1058	Lexicographically Smallest Equivalent String	Medium
1059	Missing Element in Sorted Array	Medium
1060	Longest Repeating Substring	Medium
1061	Number of Valid Subarrays	Hard
1062	Partition Array Into Three Parts With Equal Sum	Easy
1063	Best Sightseeing Pair	Medium
1064	Smallest Integer Divisible by K	Medium
1065	Binary String With Substrings Representing 1 To N	Medium
1066	Fixed Point	Easy
1067	Campus Bikes II	Medium
1068	Digit Count in Range	Hard
1069	Confusing Number	Easy
1070	Convert to Base -2	Medium
1071	Binary Prefix Divisible By 5	Easy
1072	Next Greater Node In Linked List	Medium
1073	Number of Enclaves	Medium
1074	High Five	Easy
1075	Index Pairs of a String	Easy
1076	Brace Expansion	Medium
1077	Confusing Number II	Hard
1078	Remove Outermost Parentheses	Easy
1079	Sum of Root To Leaf Binary Numbers	Easy
1080	Camelcase Matching	Medium
1081	Video Stitching	Medium
1082	Sum of Digits in the Minimum Number	Easy
1083	Two Sum Less Than K	Easy
1084	Find K-Length Substrings With No Repeated Characters	Medium
1085	The Earliest Moment When Everyone Become Friends	Medium
1086	Divisor Game	Easy
1087	Longest Arithmetic Subsequence	Medium
1088	Number of Days in a Month	Easy
1089	Remove Vowels from a String	Easy
1090	Armstrong Number	Easy
1091	Maximum Average Subtree	Medium
1092	Maximum Difference Between Node and Ancestor	Medium
1093	Recover a Tree From Preorder Traversal	Hard
1094	Matrix Cells in Distance Order	Easy
1095	Two City Scheduling	Medium
1096	Maximum Sum of Two Non-Overlapping Subarrays	Medium
1097	Stream of Characters	Hard
1098	Largest Unique Number	Easy
1099	Path With Maximum Minimum Value	Medium
1100	Connecting Cities With Minimum Cost	Medium
1101	Parallel Courses	Medium
1102	Check If a Number Is Majority Element in a Sorted Array	Easy
1103	Moving Stones Until Consecutive	Medium
1104	Coloring A Border	Medium
1105	Uncrossed Lines	Medium
1106	Escape a Large Maze	Hard
1107	Minimum Swaps to Group All 1's Together	Medium
1108	Analyze User Website Visit Pattern	Medium
1111	Minimum Score Triangulation of Polygon	Medium
1112	Find Words That Can Be Formed by Characters	Easy
1113	Moving Stones Until Consecutive II	Medium
1114	Binary Search Tree to Greater Sum Tree	Medium
1115	Valid Boomerang	Easy
1116	Maximum Level Sum of a Binary Tree	Medium
1117	As Far from Land as Possible	Medium
1118	Divide Array Into Increasing Sequences	Hard
1119	Robot Bounded In Circle	Medium
1120	Flower Planting With No Adjacent	Medium
1121	Partition Array for Maximum Sum	Medium
1122	Longest Duplicate Substring	Hard
1123	Single-Row Keyboard	Easy
1124	String Transforms Into Another String	Hard
1125	Design File System	Medium
1126	Minimum Cost to Connect Sticks	Medium
1127	Last Stone Weight	Easy
1128	Remove All Adjacent Duplicates In String	Easy
1129	Longest String Chain	Medium
1130	Last Stone Weight II	Medium
1131	Count Substrings with Only One Distinct Letter	Easy
1132	Before and After Puzzle	Medium
1133	Last Substring in Lexicographical Order	Hard
1134	Shortest Distance to Target Color	Medium
1135	Customers Who Bought All Products	Medium
1136	Actors and Directors Who Cooperated At Least Three Times	Easy
1137	Height Checker	Easy
1138	Grumpy Bookstore Owner	Medium
1139	Previous Permutation With One Swap	Medium
1140	Distant Barcodes	Medium
1141	How Many Apples Can You Put into the Basket	Easy
1142	Minimum Knight Moves	Medium
1143	Find Smallest Common Element in All Rows	Medium
1144	Optimize Water Distribution in a Village	Hard
1145	Number of Submatrices That Sum to Target	Hard
1146	Greatest Common Divisor of Strings	Easy
1147	Flip Columns For Maximum Number of Equal Rows	Medium
1148	Adding Two Negabinary Numbers	Medium
1149	Intersection of Three Sorted Arrays	Easy
1150	Two Sum BSTs	Medium
1151	Stepping Numbers	Medium
1152	Maximum Number of Ones	Hard
1153	Product Sales Analysis I	Easy
1154	Product Sales Analysis II	Easy
1155	Product Sales Analysis III	Medium
1156	Occurrences After Bigram	Easy
1157	Insufficient Nodes in Root to Leaf Paths	Medium
1159	Smallest Subsequence of Distinct Characters	Medium
1160	Letter Tile Possibilities	Medium
1161	Project Employees I	Easy
1162	Project Employees II	Easy
1163	Project Employees III	Medium
1164	Missing Number In Arithmetic Progression	Easy
1165	Meeting Scheduler	Medium
1166	Toss Strange Coins	Medium
1167	Minimum Time to Build Blocks	Hard
1168	Duplicate Zeros	Easy
1169	Largest Values From Labels	Medium
1170	Shortest Common Supersequence	Hard
1171	Shortest Path in Binary Matrix	Medium
1172	Sales Analysis I	Easy
1173	Sales Analysis II	Easy
1174	Sales Analysis III	Easy
1175	Array Transformation	Easy
1176	Design A Leaderboard	Medium
1177	Tree Diameter	Medium
1178	Valid Palindrome III	Hard
1179	Game Play Analysis I	Easy
1180	Game Play Analysis II	Easy
1181	Game Play Analysis III	Medium
1182	Game Play Analysis IV	Medium
1183	Statistics from a Large Sample	Medium
1184	Car Pooling	Medium
1185	Find in Mountain Array	Hard
1186	Building H2O	Medium
1187	Print FooBar Alternately	Medium
1188	Brace Expansion II	Hard
1189	Encode Number	Medium
1190	Smallest Common Region	Medium
1191	Synonymous Sentences	Medium
1192	Divide Chocolate	Hard
1193	Game Play Analysis V	Hard
1194	Path In Zigzag Labelled Binary Tree	Medium
1195	Distribute Candies to People	Easy
1196	Filling Bookcase Shelves	Medium
1197	Parsing A Boolean Expression	Hard
1198	Unpopular Books	Medium
1199	Hexspeak	Easy
1200	Remove Interval	Medium
1201	Delete Tree Nodes	Medium
1202	Palindrome Removal	Hard
1203	Print in Order	Easy
1204	New Users Daily Count	Medium
1205	Defanging an IP Address	Easy
1206	Corporate Flight Bookings	Medium
1207	Delete Nodes And Return Forest	Medium
1208	Maximum Nesting Depth of Two Valid Parentheses Strings	Medium
1209	Design Bounded Blocking Queue	Medium
1210	Mean of Array After Removing Some Elements	Easy
1211	Iterator for Combination	Medium
1212	Sequential Digits	Medium
1213	Handshakes That Don't Cross	Hard
1214	Highest Grade For Each Student	Medium
1215	Reported Posts	Easy
1216	Print Zero Even Odd	Medium
1217	Relative Sort Array	Easy
1218	Lowest Common Ancestor of Deepest Leaves	Medium
1219	Longest Well-Performing Interval	Medium
1220	Smallest Sufficient Team	Hard
1221	Element Appearing More Than 25% In Sorted Array	Easy
1222	Remove Covered Intervals	Medium
1223	Graph Connectivity With Threshold	Hard
1224	Minimum Falling Path Sum II	Hard
1225	Active Businesses	Medium
1226	User Purchase Platform	Hard
1227	Number of Equivalent Domino Pairs	Easy
1228	Minimum Cost Tree From Leaf Values	Medium
1229	Shortest Path with Alternating Colors	Medium
1230	Maximum of Absolute Value Expression	Medium
1231	Replace Elements with Greatest Element on Right Side	Easy
1232	Sum of Mutated Array Closest to Target	Medium
1233	Number of Ships in a Rectangle	Hard
1234	Number of Paths with Max Score	Hard
1236	N-th Tribonacci Number	Easy
1237	Reported Posts II	Medium
1238	Alphabet Board Path	Medium
1239	Largest 1-Bordered Square	Medium
1240	Stone Game II	Medium
1241	Decompress Run-Length Encoded List	Easy
1242	Matrix Block Sum	Medium
1243	Sum of Nodes with Even-Valued Grandparent	Medium
1244	Distinct Echo Substrings	Hard
1245	User Activity for the Past 30 Days I	Easy
1246	User Activity for the Past 30 Days II	Easy
1247	Decrease Elements To Make Array Zigzag	Medium
1248	Binary Tree Coloring Game	Medium
1249	Snapshot Array	Medium
1250	Longest Common Subsequence	Medium
1251	Longest Chunked Palindrome Decomposition	Hard
1252	Break a Palindrome	Medium
1253	Sort the Matrix Diagonally	Medium
1254	Deepest Leaves Sum	Medium
1255	Reverse Subarray To Maximize Array Value	Hard
1256	Rank Transform of an Array	Easy
1257	Rank Transform of a Matrix	Hard
1258	Article Views I	Easy
1259	Article Views II	Medium
1260	Day of the Year	Easy
1261	Swap For Longest Repeated Character Substring	Medium
1262	Online Majority Element In Subarray	Hard
1263	Number of Dice Rolls With Target Sum	Medium
1264	Maximum Number of Words You Can Type	Easy
1267	Remove Zero Sum Consecutive Nodes from Linked List	Medium
1268	Market Analysis I	Medium
1269	Market Analysis II	Hard
1270	Dinner Plate Stacks	Hard
1271	Web Crawler	Medium
1272	Invalid Transactions	Medium
1273	Compare Strings by Frequency of the Smallest Character	Medium
1274	Number of Days Between Two Dates	Easy
1275	Validate Binary Tree Nodes	Medium
1276	Closest Divisors	Medium
1277	Largest Multiple of Three	Hard
1278	Product Price at a Given Date	Medium
1279	Prime Arrangements	Easy
1280	Diet Plan Performance	Easy
1281	Can Make Palindrome from Substring	Medium
1282	Number of Valid Words for Each Puzzle	Hard
1283	Reformat Date	Easy
1284	Four Divisors	Medium
1285	Balance a Binary Search Tree	Medium
1286	Constrained Subsequence Sum	Hard
1287	Distance Between Bus Stops	Easy
1288	Maximum Subarray Sum with One Deletion	Medium
1289	Day of the Week	Easy
1290	Make Array Strictly Increasing	Hard
1291	Immediate Food Delivery I	Easy
1292	Immediate Food Delivery II	Medium
1293	Three Consecutive Odds	Easy
1294	Range Frequency Queries	Medium
1295	Minimum Garden Perimeter to Collect Enough Apples	Medium
1296	Kth Ancestor of a Tree Node	Hard
1297	Maximum Number of Balloons	Easy
1298	Reverse Substrings Between Each Pair of Parentheses	Medium
1299	K-Concatenation Maximum Sum	Medium
1300	Critical Connections in a Network	Hard
1301	Reformat Department Table	Easy
1302	Delete Characters to Make Fancy String	Easy
1303	Minimum Moves to Reach Target Score	Medium
1304	Longest Happy String	Medium
1305	Number of Visible People in a Queue	Hard
1306	Minimum Absolute Difference	Easy
1307	Ugly Number III	Medium
1308	Smallest String With Swaps	Medium
1309	Sort Items by Groups Respecting Dependencies	Hard
1310	Watering Plants	Medium
1311	Largest Magic Square	Medium
1312	Count Artifacts That Can Be Extracted	Medium
1313	Count Ways to Build Rooms in an Ant Colony	Hard
1316	Fizz Buzz Multithreaded	Medium
1317	Monthly Transactions I	Medium
1318	Tournament Winners	Hard
1319	Unique Number of Occurrences	Easy
1320	Remove All Adjacent Duplicates in String II	Medium
1321	Get Equal Substrings Within Budget	Medium
1322	Minimum Moves to Reach Target with Rotations	Hard
1324	Where Will the Ball Fall	Medium
1325	Path with Maximum Probability	Medium
1326	Sum of Floored Pairs	Hard
1327	Last Person to Fit in the Bus	Medium
1328	Monthly Transactions II	Medium
1329	Minimum Cost to Move Chips to The Same Position	Easy
1330	Longest Arithmetic Subsequence of Given Difference	Medium
1331	Path with Maximum Gold	Medium
1332	Count Vowels Permutation	Hard
1333	Sort the Jumbled Numbers	Medium
1335	Maximum Candies Allocated to K Children	Medium
1336	Maximum Product of the Length of Two Palindromic Substrings	Hard
1337	Design Skiplist	Hard
1338	Queries Quality and Percentage	Easy
1339	Team Scores in Football Tournament	Medium
1340	The Dining Philosophers	Medium
1341	Split a String in Balanced Strings	Easy
1342	Queens That Can Attack the King	Medium
1343	Dice Roll Simulation	Hard
1344	Maximum Equal Frequency	Hard
1345	Perform String Shifts	Easy
1346	Maximize the Topmost Element After K Moves	Medium
1347	Distance to a Cycle in Undirected Graph	Hard
1349	Check If It Is a Straight Line	Easy
1350	Remove Sub-Folders from the Filesystem	Medium
1351	Replace the Substring for Balanced String	Medium
1352	Maximum Profit in Job Scheduling	Hard
1353	Find Resultant Array After Removing Anagrams	Easy
1354	Find Players With Zero or One Losses	Medium
1355	Minimum Deletions to Make Array Beautiful	Medium
1356	Minimum Number of Moves to Make Palindrome	Hard
1357	Report Contiguous Dates	Hard
1358	Find Positive Integer Solution for a Given Equation	Medium
1359	Circular Permutation in Binary Representation	Medium
1360	Maximum Length of a Concatenated String with Unique Characters	Medium
1361	Tiling a Rectangle with the Fewest Squares	Hard
1362	Airplane Seat Assignment Probability	Medium
1364	Tuple with Same Product	Medium
1366	First Unique Number	Medium
1367	Maximum Height by Stacking Cuboids	Hard
1368	Web Crawler Multithreaded	Medium
1369	Minimum Swaps to Make Strings Equal	Medium
1370	Count Number of Nice Subarrays	Medium
1371	Minimum Remove to Make Valid Parentheses	Medium
1372	Check If It Is a Good Array	Hard
1374	Leftmost Column with at Least a One	Medium
1375	Find Palindrome With Fixed Length	Medium
1377	Number of Comments per Post	Easy
1378	Cells with Odd Values in a Matrix	Easy
1379	Reconstruct a 2-Row Binary Matrix	Medium
1380	Number of Closed Islands	Medium
1381	Maximum Score Words Formed by Letters	Hard
1383	Number of Single Divisor Triplets	Medium
1384	Maximum Font to Fit a Sentence in a Screen	Medium
1385	Number of Ways to Build House of Cards	Medium
1386	Shift 2D Grid	Easy
1387	Find Elements in a Contaminated Binary Tree	Medium
1388	Greatest Sum Divisible by Three	Medium
1389	Minimum Moves to Move a Box to Their Target Location	Hard
1390	Average Selling Price	Easy
1391	Counting Elements	Easy
1392	Find the Difference of Two Arrays	Easy
1393	Maximum Value of K Coins From Piles	Hard
1395	Minimum Time Visiting All Points	Easy
1396	Count Servers that Communicate	Medium
1397	Search Suggestions System	Medium
1398	Number of Ways to Stay in the Same Place After Some Steps	Hard
1399	Page Recommendations	Medium
1400	Find Winner on a Tic Tac Toe Game	Easy
1401	Number of Burgers with No Waste of Ingredients	Medium
1402	Count Square Submatrices with All Ones	Medium
1403	Palindrome Partitioning III	Hard
1404	Print Immutable Linked List in Reverse	Medium
1405	All People Report to the Given Manager	Medium
1406	Subtract the Product and Sum of Digits of an Integer	Easy
1407	Group the People Given the Group Size They Belong To	Medium
1408	Find the Smallest Divisor Given a Threshold	Medium
1409	Minimum Number of Flips to Convert Binary Matrix to Zero Matrix	Hard
1410	Traffic Light Controlled Intersection	Easy
1411	Convert Binary Number in a Linked List to Integer	Easy
1413	Maximum Side Length of a Square with Sum Less than or Equal to Threshold	Medium
1414	Shortest Path in a Grid with Obstacles Elimination	Hard
1415	Students and Examinations	Easy
1416	Check if an Array Is Consecutive	Easy
1419	Make Array Non-decreasing or Non-increasing	Hard
1420	Find the Start and End Number of Continuous Ranges	Medium
1421	Find Numbers with Even Number of Digits	Easy
1422	Divide Array in Sets of K Consecutive Numbers	Medium
1423	Maximum Number of Occurrences of a Substring	Medium
1424	Maximum Candies You Can Get from Boxes	Hard
1425	Weather Type in Each Country	Easy
1426	Find N Unique Integers Sum up to Zero	Easy
1427	All Elements in Two Binary Search Trees	Medium
1428	Jump Game III	Medium
1429	Verbal Arithmetic Puzzle	Hard
1430	Find the K-Beauty of a Number	Easy
1431	All Ancestors of a Node in a Directed Acyclic Graph	Medium
1432	Check If a String Is a Valid Sequence from Root to Leaves Path in a Binary Tree	Medium
1433	Encrypt and Decrypt Strings	Hard
1434	Decrypt String from Alphabet to Integer Mapping	Easy
1435	XOR Queries of a Subarray	Medium
1436	Get Watched Videos by Your Friends	Medium
1437	Minimum Insertion Steps to Make a String Palindrome	Hard
1438	Find the Team Size	Easy
1439	Running Total for Different Genders	Medium
1440	Convert Integer to the Sum of Two No-Zero Integers	Easy
1441	Minimum Flips to Make a OR b Equal to c	Medium
1442	Number of Operations to Make Network Connected	Medium
1443	Minimum Distance to Type a Word Using Two Fingers	Hard
1444	Number of Steps to Reduce a Number to Zero	Easy
1445	Number of Sub-arrays of Size K and Average Greater than or Equal to Threshold	Medium
1446	Angle Between Hands of a Clock	Medium
1447	Jump Game IV	Hard
1448	Maximum 69 Number	Easy
1449	Print Words Vertically	Medium
1450	Delete Leaves With a Given Value	Medium
1451	Minimum Number of Taps to Open to Water a Garden	Hard
1452	Restaurant Growth	Medium
1453	Ads Performance	Easy
1454	Remove Palindromic Subsequences	Easy
1455	Filter Restaurants by Vegan-Friendly, Price and Distance	Medium
1456	Find the City With the Smallest Number of Neighbors at a Threshold Distance	Medium
1457	Minimum Difficulty of a Job Schedule	Hard
1458	Sort Integers by The Number of 1 Bits	Easy
1459	Apply Discount Every n Orders	Medium
1460	Number of Substrings Containing All Three Characters	Medium
1461	Count All Valid Pickup and Delivery Options	Hard
1462	List the Products Ordered in a Period	Easy
1463	The K Weakest Rows in a Matrix	Easy
1464	Reduce Array Size to The Half	Medium
1465	Maximum Product of Splitted Binary Tree	Medium
1466	Jump Game V	Hard
1467	Number of Transactions per Visit	Hard
1468	Check If N and Its Double Exist	Easy
1469	Minimum Number of Steps to Make Two Strings Anagram	Medium
1470	Tweet Counts Per Frequency	Medium
1471	Maximum Students Taking Exam	Hard
1472	Increasing Decreasing String	Easy
1473	Find the Longest Substring Containing Vowels in Even Counts	Medium
1474	Longest ZigZag Path in a Binary Tree	Medium
1475	Maximum Sum BST in Binary Tree	Hard
1476	Count Negative Numbers in a Sorted Matrix	Easy
1477	Product of the Last K Numbers	Medium
1478	Maximum Number of Events That Can Be Attended	Medium
1479	Construct Target Array With Multiple Sums	Hard
1480	Movie Rating	Medium
1481	Students With Invalid Departments	Easy
1482	How Many Numbers Are Smaller Than the Current Number	Easy
1483	Rank Teams by Votes	Medium
1484	Linked List in Binary Tree	Medium
1485	Minimum Cost to Make at Least One Valid Path in a Grid	Hard
1486	Find the Distance Value Between Two Arrays	Easy
1487	Cinema Seat Allocation	Medium
1488	Sort Integers by The Power Value	Medium
1489	Pizza With 3n Slices	Hard
1490	Generate a String With Characters That Have Odd Counts	Easy
1491	Number of Times Binary String Is Prefix-Aligned	Medium
1492	Time Needed to Inform All Employees	Medium
1493	Frog Position After T Seconds	Hard
1494	Activity Participants	Medium
1495	Number of Trusted Contacts of a Customer	Medium
1496	Lucky Numbers in a Matrix	Easy
1497	Design a Stack With Increment Operation	Medium
1498	Find a Corresponding Node of a Binary Tree in a Clone of That Tree	Medium
1499	Maximum Performance of a Team	Hard
1500	Count Largest Group	Easy
1501	Circle and Rectangle Overlapping	Medium
1502	Construct K Palindrome Strings	Medium
1503	Reducing Dishes	Hard
1504	Get the Second Most Recent Activity	Hard
1505	Create Target Array in the Given Order	Easy
1507	Check if There is a Valid Path in a Grid	Medium
1508	Longest Happy Prefix	Hard
1509	Replace Employee ID With The Unique Identifier	Easy
1510	Find Lucky Integer in an Array	Easy
1511	Count Number of Teams	Medium
1512	Design Underground System	Medium
1513	Find All Good Strings	Hard
1514	Minimum Value to Get Positive Step by Step Sum	Easy
1515	Find the Minimum Number of Fibonacci Numbers Whose Sum Is K	Medium
1516	The k-th Lexicographical String of All Happy Strings of Length n	Medium
1517	Restore The Array	Hard
1518	Total Sales Amount by Year	Hard
1519	Minimum Subsequence in Non-Increasing Order	Easy
1520	Number of Steps to Reduce a Number in Binary Representation to One	Medium
1522	Stone Game III	Hard
1523	Capital Gain/Loss	Medium
1524	String Matching in an Array	Easy
1525	Queries on a Permutation With Key	Medium
1526	HTML Entity Parser	Medium
1527	Number of Ways to Paint N �� 3 Grid	Hard
1528	Kids With the Greatest Number of Candies	Easy
1529	Max Difference You Can Get From Changing an Integer	Medium
1530	Check If a String Can Break Another String	Medium
1531	Number of Ways to Wear Different Hats to Each Other	Hard
1532	Reformat The String	Easy
1533	Display Table of Food Orders in a Restaurant	Medium
1534	Minimum Number of Frogs Croaking	Medium
1535	Build Array Where You Can Find The Maximum Exactly K Comparisons	Hard
1536	Customers Who Bought Products A and B but Not C	Medium
1537	Maximum Score After Splitting a String	Easy
1538	Maximum Points You Can Obtain from Cards	Medium
1539	Diagonal Traverse II	Medium
1541	Top Travellers	Easy
1542	Consecutive Characters	Easy
1543	Simplified Fractions	Medium
1544	Count Good Nodes in Binary Tree	Medium
1545	Form Largest Integer With Digits That Add up to Target	Hard
1546	Find the Quiet Students in All Exams	Hard
1547	Destination City	Easy
1548	Check If All 1's Are at Least Length K Places Away	Easy
1549	Longest Continuous Subarray With Absolute Diff Less Than or Equal to Limit	Medium
1550	Find the Kth Smallest Sum of a Matrix With Sorted Rows	Hard
1551	NPV Queries	Easy
1552	Build an Array With Stack Operations	Easy
1553	Count Triplets That Can Form Two Arrays of Equal XOR	Medium
1554	Minimum Time to Collect All Apples in a Tree	Medium
1555	Number of Ways of Cutting a Pizza	Hard
1556	Make Two Arrays Equal by Reversing Sub-arrays	Easy
1557	Check If a String Contains All Binary Codes of Size K	Medium
1558	Course Schedule IV	Medium
1559	Cherry Pickup II	Hard
1560	Number of Students Doing Homework at a Given Time	Easy
1561	Rearrange Words in a Sentence	Medium
1562	People Whose List of Favorite Companies Is Not a Subset of Another List	Medium
1563	Maximum Number of Darts Inside of a Circular Dartboard	Hard
1564	Create a Session Bar Chart	Easy
1565	Evaluate Boolean Expression	Medium
1566	Check If a Word Occurs As a Prefix of Any Word in a Sentence	Easy
1567	Maximum Number of Vowels in a Substring of Given Length	Medium
1568	Pseudo-Palindromic Paths in a Binary Tree	Medium
1569	Max Dot Product of Two Subsequences	Hard
1570	Final Prices With a Special Discount in a Shop	Easy
1571	Allocate Mailboxes	Hard
1572	Subrectangle Queries	Medium
1573	Find Two Non-overlapping Sub-arrays Each With Target Sum	Medium
1574	Maximum Product of Two Elements in an Array	Easy
1575	Maximum Area of a Piece of Cake After Horizontal and Vertical Cuts	Medium
1576	Reorder Routes to Make All Paths Lead to the City Zero	Medium
1577	Probability of a Two Boxes Having The Same Number of Distinct Balls	Hard
1578	Apples & Oranges	Medium
1579	Active Users	Medium
1580	Shuffle the Array	Easy
1581	The k Strongest Values in an Array	Medium
1582	Design Browser History	Medium
1583	Paint House III	Hard
1584	Average Salary Excluding the Minimum and Maximum Salary	Easy
1585	The kth Factor of n	Medium
1586	Longest Subarray of 1's After Deleting One Element	Medium
1587	Parallel Courses II	Hard
1603	Running Sum of 1d Array	Easy
1604	Least Number of Unique Integers after K Removals	Medium
1605	Minimum Number of Days to Make m Bouquets	Medium
1607	Rectangles Area	Medium
1608	Calculate Salaries	Medium
1609	Find All The Lonely Nodes	Easy
1610	XOR Operation in an Array	Easy
1611	Making File Names Unique	Medium
1612	Avoid Flood in The City	Medium
1613	Find Critical and Pseudo-Critical Edges in Minimum Spanning Tree	Hard
1615	Range Sum of Sorted Subarray Sums	Medium
1616	Minimum Difference Between Largest and Smallest Value in Three Moves	Medium
1617	Stone Game IV	Hard
1618	Delete N Nodes After M Nodes of a Linked List	Easy
1619	Path Crossing	Easy
1620	Check If Array Pairs Are Divisible by k	Medium
1621	Number of Subsequences That Satisfy the Given Sum Condition	Medium
1622	Max Value of Equation	Hard
1623	Sales by Day of the Week	Hard
1624	Clone Binary Tree With Random Pointer	Medium
1625	Group Sold Products By The Date	Easy
1626	Can Make Arithmetic Progression From Sequence	Easy
1627	Last Moment Before All Ants Fall Out of a Plank	Medium
1628	Count Submatrices With All Ones	Medium
1629	Minimum Possible Integer After at Most K Adjacent Swaps On Digits	Hard
1630	Count Odd Numbers in an Interval Range	Easy
1631	Number of Sub-arrays With Odd Sum	Medium
1632	Number of Good Ways to Split a String	Medium
1633	Minimum Number of Increments on Subarrays to Form a Target Array	Hard
1634	Clone N-ary Tree	Medium
1635	Number of Good Pairs	Easy
1636	Number of Substrings With Only 1s	Medium
1637	String Compression II	Hard
1638	Best Position for a Service Centre	Hard
1639	Friendly Movies Streamed Last Month	Easy
1640	Design a File Sharing System	Medium
1641	Countries You Can Safely Invest In	Medium
1642	Water Bottles	Easy
1643	Number of Nodes in the Sub-Tree With the Same Label	Medium
1644	Maximum Number of Non-Overlapping Substrings	Hard
1645	Find a Value of a Mysterious Function Closest to Target	Hard
1646	Kth Missing Positive Number	Easy
1647	Can Convert String in K Moves	Medium
1648	Minimum Insertions to Balance a Parentheses String	Medium
1649	Maximum Number of Non-Overlapping Subarrays With Sum Equals Target	Medium
1650	Find Root of N-Ary Tree	Medium
1651	Shuffle String	Easy
1652	Minimum Suffix Flips	Medium
1653	Number of Good Leaf Nodes Pairs	Medium
1654	Customer Order Frequency	Easy
1655	Move Sub-Tree of N-Ary Tree	Hard
1656	Count Good Triplets	Easy
1657	Find the Winner of an Array Game	Medium
1658	Minimum Swaps to Arrange a Binary Grid	Medium
1659	Get the Maximum Score	Hard
1660	Thousand Separator	Easy
1661	Minimum Number of Vertices to Reach All Nodes	Medium
1662	Minimum Numbers of Function Calls to Make Target Array	Medium
1663	Detect Cycles in 2D Grid	Medium
1664	Find Users With Valid E-Mails	Easy
1665	Diameter of N-Ary Tree	Medium
1666	Make The String Great	Easy
1667	Find Kth Bit in Nth Binary String	Medium
1668	Find Longest Awesome Substring	Hard
1669	Minimum Cost to Cut a Stick	Hard
1670	Patients With a Condition	Easy
1671	The Most Recent Three Orders	Medium
1672	Find the Index of the Large Integer	Medium
1674	Minimum Operations to Make Array Equal	Medium
1675	Magnetic Force Between Two Balls	Medium
1676	Minimum Number of Days to Eat N Oranges	Hard
1677	Matrix Diagonal Sum	Easy
1678	Number of Ways to Split a String	Medium
1679	Shortest Subarray to be Removed to Make Array Sorted	Medium
1680	Count All Possible Routes	Hard
1681	Guess the Majority in a Hidden Array	Medium
1682	Most Visited Sector in a Circular Track	Easy
1683	Maximum Number of Coins You Can Get	Medium
1684	Find Latest Group of Size M	Medium
1685	Stone Game V	Hard
1686	Fix Product Name Format	Easy
1687	The Most Similar Path in a Graph	Hard
1688	The Most Recent Orders for Each Product	Medium
1689	Detect Pattern of Length M Repeated K or More Times	Easy
1690	Maximum Length of Subarray With Positive Product	Medium
1691	Minimum Number of Days to Disconnect Island	Hard
1692	Number of Ways to Reorder Array to Get Same BST	Hard
1693	Sum of All Odd Length Subarrays	Easy
1694	Make Sum Divisible by P	Medium
1695	Maximum Sum Obtained of Any Permutation	Medium
1696	Strange Printer II	Hard
1697	Strings Differ by One Character	Medium
1698	Replace All ?'s to Avoid Consecutive Repeating Characters	Easy
1699	Number of Ways Where Square of Number Is Equal to Product of Two Numbers	Medium
1700	Minimum Time to Make Rope Colorful	Medium
1701	Remove Max Number of Edges to Keep Graph Fully Traversable	Hard
1702	Bank Account Summary	Medium
1703	Put Boxes Into the Warehouse I	Medium
1704	Special Positions in a Binary Matrix	Easy
1705	Count Unhappy Friends	Medium
1706	Min Cost to Connect All Points	Medium
1707	Check If String Is Transformable With Substring Sort Operations	Hard
1708	Design Parking System	Easy
1709	Alert Using Same Key-Card Three or More Times in a One Hour Period	Medium
1710	Find Servers That Handled Most Number of Requests	Hard
1711	Find Valid Matrix Given Row and Column Sums	Medium
1712	Unique Orders and Customers Per Month	Easy
1713	Dot Product of Two Sparse Vectors	Medium
1714	Rearrange Spaces Between Words	Easy
1715	Split a String Into the Max Number of Unique Substrings	Medium
1716	Maximum Non Negative Product in a Matrix	Medium
1717	Minimum Cost to Connect Two Groups of Points	Hard
1718	Warehouse Manager	Easy
1719	Put Boxes Into the Warehouse II	Medium
1720	Crawler Log Folder	Easy
1721	Maximum Profit of Operating a Centennial Wheel	Medium
1722	Throne Inheritance	Medium
1723	Maximum Number of Achievable Transfer Requests	Hard
1724	Customer Who Visited but Did Not Make Any Transactions	Easy
1725	Number of Sets of K Non-Overlapping Line Segments	Medium
1726	Coordinate With Maximum Network Quality	Medium
1727	Cat and Mouse II	Hard
1728	Fancy Sequence	Hard
1729	Binary Search Tree Iterator II	Medium
1730	Special Array With X Elements Greater Than or Equal X	Easy
1731	Even Odd Tree	Medium
1732	Minimum One Bit Operations to Make Integers Zero	Hard
1733	Maximum Number of Visible Points	Hard
1734	Bank Account Summary II	Easy
1735	The Most Frequently Ordered Products for Each Customer	Medium
1736	Build Binary Expression Tree From Infix Expression	Hard
1737	Maximum Nesting Depth of the Parentheses	Easy
1738	Maximal Network Rank	Medium
1739	Split Two Strings to Make Palindrome	Medium
1740	Count Subtrees With Max Distance Between Cities	Hard
1741	Sort Array by Increasing Frequency	Easy
1742	Widest Vertical Area Between Two Points Containing No Points	Medium
1743	Count Substrings That Differ by One Character	Medium
1744	Number of Ways to Form a Target String Given a Dictionary	Hard
1745	Find Nearest Right Node in Binary Tree	Medium
1746	Largest Substring Between Two Equal Characters	Easy
1747	Lexicographically Smallest String After Applying Operations	Medium
1748	Best Team With No Conflicts	Medium
1749	Sellers With No Sales	Easy
1750	Check If Two Expression Trees are Equivalent	Medium
1751	Slowest Key	Easy
1752	Arithmetic Subarrays	Medium
1753	Path With Minimum Effort	Medium
1755	Defuse the Bomb	Easy
1756	Minimum Deletions to Make String Balanced	Medium
1757	Minimum Jumps to Reach Home	Medium
1758	Distribute Repeating Integers	Hard
1759	Find the Missing IDs	Medium
1760	Check Array Formation Through Concatenation	Easy
1761	Count Sorted Vowel Strings	Medium
1762	Furthest Building You Can Reach	Medium
1763	All Valid Triplets That Can Represent a Country	Easy
1764	Maximum Repeating Substring	Easy
1765	Merge In Between Linked Lists	Medium
1766	Minimum Number of Removals to Make Mountain Array	Hard
1767	Design Front Middle Back Queue	Medium
1768	Design an Expression Tree With Evaluate Function	Medium
1769	Get Maximum in Generated Array	Easy
1770	Minimum Deletions to Make Character Frequencies Unique	Medium
1771	Sell Diminishing-Valued Colored Balls	Medium
1772	Create Sorted Array through Instructions	Hard
1773	Percentage of Users Attended a Contest	Easy
1774	Add Two Polynomials Represented as Linked Lists	Medium
1775	Design an Ordered Stream	Easy
1776	Minimum Operations to Reduce X to Zero	Medium
1777	Determine if Two Strings Are Close	Medium
1778	Maximize Grid Happiness	Hard
1779	Hopper Company Queries I	Hard
1780	Lowest Common Ancestor of a Binary Tree II	Medium
1781	Check If Two String Arrays are Equivalent	Easy
1782	Smallest String With A Given Numeric Value	Medium
1783	Ways to Make a Fair Array	Medium
1784	Minimum Initial Energy to Finish Tasks	Hard
1785	Hopper Company Queries II	Hard
1786	Count the Number of Consistent Strings	Easy
1787	Sum of Absolute Differences in a Sorted Array	Medium
1788	Stone Game VI	Medium
1789	Delivering Boxes from Storage to Ports	Hard
1790	Lowest Common Ancestor of a Binary Tree III	Medium
1791	Richest Customer Wealth	Easy
1792	Find the Most Competitive Subsequence	Medium
1793	Minimum Moves to Make Array Complementary	Medium
1794	Minimize Deviation in Array	Hard
1795	Hopper Company Queries III	Hard
1796	Correct a Binary Tree	Medium
1797	Goal Parser Interpretation	Easy
1798	Max Number of K-Sum Pairs	Medium
1799	Minimum Incompatibility	Hard
1800	Concatenation of Consecutive Binary Numbers	Medium
1801	Average Time of Process per Machine	Easy
1802	Number of Students Unable to Eat Lunch	Easy
1803	Average Waiting Time	Medium
1804	Maximum Binary String After Change	Medium
1805	Minimum Adjacent Swaps for K Consecutive Ones	Hard
1806	Count of Matches in Tournament	Easy
1807	Partitioning Into Minimum Number Of Deci-Binary Numbers	Medium
1808	Stone Game VII	Medium
1809	Sum Of Special Evenly-Spaced Elements In Array	Hard
1810	Change the Root of a Binary Tree	Medium
1811	Fix Names in a Table	Easy
1812	Reformat Phone Number	Easy
1813	Maximum Erasure Value	Medium
1814	Jump Game VI	Medium
1815	Checking Existence of Edge Length Limited Paths	Hard
1816	Lowest Common Ancestor of a Binary Tree IV	Medium
1817	Calculate Money in Leetcode Bank	Easy
1818	Maximum Score From Removing Substrings	Medium
1819	Construct the Lexicographically Largest Valid Sequence	Medium
1820	Number Of Ways To Reconstruct A Tree	Hard
1821	Product's Worth Over Invoices	Easy
1822	Longest Palindromic Subsequence II	Medium
1823	Determine if String Halves Are Alike	Easy
1824	Maximum Number of Eaten Apples	Medium
1825	Find Minimum Time to Finish All Jobs	Hard
1826	Maximum XOR With an Element From Array	Hard
1827	Invalid Tweets	Easy
1828	Count Ways to Distribute Candies	Hard
1829	Maximum Units on a Truck	Easy
1830	Count Good Meals	Medium
1831	Ways to Split Array Into Three Subarrays	Medium
1832	Minimum Operations to Make a Subsequence	Hard
1833	Find the Highest Altitude	Easy
1834	Minimum Number of People to Teach	Medium
1835	Decode XORed Permutation	Medium
1836	Count Ways to Make Array With Product	Hard
1837	Daily Leads and Partners	Easy
1838	Number of Distinct Substrings in a String	Medium
1839	Decode XORed Array	Easy
1840	Minimize Hamming Distance After Swap Operations	Medium
1842	Number of Calls Between Two Persons	Medium
1843	Number Of Rectangles That Can Form The Largest Square	Easy
1844	Maximum Number of Balls in a Box	Easy
1845	Largest Submatrix With Rearrangements	Medium
1847	Largest Subarray Length K	Easy
1848	Sum of Unique Elements	Easy
1849	Maximum Absolute Sum of Any Subarray	Medium
1850	Minimum Length of String After Deleting Similar Ends	Medium
1851	Maximum Number of Events That Can Be Attended II	Hard
1852	Biggest Window Between Visits	Medium
1858	Latest Time by Replacing Hidden Digits	Easy
1859	Change Minimum Characters to Satisfy One of Three Conditions	Medium
1860	Find Kth Largest XOR Coordinate Value	Medium
1861	Building Boxes	Hard
1862	Count Apples and Oranges	Medium
1865	Checking Existence of Edge Length Limited Paths II	Hard
1866	Restore the Array From Adjacent Pairs	Medium
1871	Palindrome Partitioning IV	Hard
1872	Can You Eat Your Favorite Candy on Your Favorite Day?	Medium
1873	Longest Nice Substring	Easy
1874	Form Array by Concatenating Subarrays of Another Array	Medium
1875	Tree of Coprimes	Hard
1876	Map of Highest Peak	Medium
1877	Find Followers Count	Easy
1878	Check if Array Is Sorted and Rotated	Easy
1879	Maximum Score From Removing Stones	Medium
1880	Largest Merge Of Two Strings	Medium
1881	Closest Subsequence Sum	Hard
1882	The Number of Employees Which Report to Each Employee	Easy
1883	Find Distance in a Binary Tree	Medium
1884	Minimum Changes To Make Alternating Binary String	Easy
1885	Count Number of Homogenous Substrings	Medium
1886	Minimum Limit of Balls in a Bag	Medium
1887	Minimum Degree of a Connected Trio in a Graph	Hard
1888	Find Nearest Point That Has the Same X or Y Coordinate	Easy
1889	Check if Number is a Sum of Powers of Three	Medium
1890	Sum of Beauty of All Substrings	Medium
1891	Count Pairs Of Nodes	Hard
1892	Find Total Time Spent by Each Employee	Easy
1893	Maximum Subarray Sum After One Operation	Medium
1894	Merge Strings Alternately	Easy
1895	Minimum Number of Operations to Move All Balls to Each Box	Medium
1896	Maximum Score from Performing Multiplication Operations	Medium
1897	Maximize Palindrome Length From Subsequences	Hard
1898	Leetflex Banned Accounts	Medium
1899	Count Items Matching a Rule	Easy
1900	Closest Dessert Cost	Medium
1901	Equal Sum Arrays With Minimum Number of Operations	Medium
1902	Car Fleet II	Hard
1903	Design Most Recently Used Queue	Medium
1904	Second Largest Digit in a String	Easy
1905	Design Authentication Manager	Medium
1906	Maximize Score After N Operations	Hard
1907	Count Pairs With XOR in a Range	Hard
1908	Recyclable and Low Fat Products	Easy
1909	Buildings With an Ocean View	Medium
1910	Check if Binary String Has at Most One Segment of Ones	Easy
1911	Minimum Elements to Add to Form a Given Sum	Medium
1912	Number of Restricted Paths From First to Last Node	Medium
1913	Make the XOR of All Segments Equal to Zero	Hard
1914	Find the Subtasks That Did Not Execute	Hard
1915	Check if One String Swap Can Make Strings Equal	Easy
1916	Find Center of Star Graph	Easy
1917	Maximum Average Pass Ratio	Medium
1918	Maximum Score of a Good Subarray	Hard
1919	Sort Features by Popularity	Medium
1920	Determine Color of a Chessboard Square	Easy
1923	Sentence Similarity III	Medium
1924	Maximum Number of Groups Getting Fresh Donuts	Hard
1925	Count Nice Pairs in an Array	Medium
1926	Product's Price for Each Store	Easy
1927	Maximum Ascending Subarray Sum	Easy
1928	Number of Orders in the Backlog	Medium
1929	Maximum Value at a Given Index in a Bounded Array	Medium
1930	Maximum Number of Consecutive Values You Can Make	Medium
1931	Shortest Path in a Hidden Grid	Medium
1932	Grand Slam Titles	Medium
1933	Number of Different Integers in a String	Easy
1934	Evaluate the Bracket Pairs of a String	Medium
1935	Minimum Number of Operations to Reinitialize a Permutation	Medium
1936	Maximize Number of Nice Divisors	Hard
1937	Maximize the Beauty of the Garden	Hard
1938	Minimum Operations to Make the Array Increasing	Easy
1939	Queries on Number of Points Inside a Circle	Medium
1940	Maximum XOR for Each Query	Medium
1941	Minimum Number of Operations to Make String Sorted	Hard
1942	Primary Department for Each Employee	Easy
1943	Count Pairs of Equal Substrings With Minimum Difference	Medium
1944	Truncate Sentence	Easy
1945	Finding the Users Active Minutes	Medium
1946	Minimum Absolute Sum Difference	Medium
1947	Number of Different Subsequences GCDs	Hard
1948	Rearrange Products Table	Easy
1949	Implement Trie II (Prefix Tree)	Medium
1950	Sign of the Product of an Array	Easy
1951	Find the Winner of the Circular Game	Medium
1952	Minimum Sideway Jumps	Medium
1953	Finding MK Average	Hard
1954	Replace All Digits with Characters	Easy
1955	Seat Reservation Manager	Medium
1956	Maximum Element After Decreasing and Rearranging	Medium
1957	Closest Room	Hard
1958	Ad-Free Sessions	Easy
1959	Minimum Path Cost in a Hidden Grid	Medium
1960	Check if the Sentence Is Pangram	Easy
1961	Maximum Ice Cream Bars	Medium
1962	Single-Threaded CPU	Medium
1963	Find XOR Sum of All Pairs Bitwise AND	Hard
1964	Find Interview Candidates	Medium
1965	Sum of Digits in Base K	Easy
1966	Frequency of the Most Frequent Element	Medium
1967	Longest Substring Of All Vowels in Order	Medium
1968	Maximum Building Height	Hard
1969	Maximum Number of Accepted Invitations	Medium
1970	Sorting the Sentence	Easy
1971	Incremental Memory Leak	Medium
1972	Rotating the Box	Medium
1974	Find Customers With Positive Revenue this Year	Easy
1975	Minimum Distance to the Target Element	Easy
1976	Splitting a String Into Descending Consecutive Values	Medium
1977	Minimum Interval to Include Each Query	Hard
1978	Minimum Adjacent Swaps to Reach the Kth Smallest Number	Medium
1979	Maximum Number of People That Can Be Caught in Tag	Medium
1980	Faulty Sensor	Easy
1981	Maximum Transaction Each Day	Medium
1982	Remove Duplicates From an Unsorted Linked List	Medium
1983	Maximum Population Year	Easy
1984	Maximum Distance Between a Pair of Values	Medium
1985	Maximum Subarray Min-Product	Medium
1986	Largest Color Value in a Directed Graph	Hard
1987	Substrings of Size Three with Distinct Characters	Easy
1988	Minimize Maximum Pair Sum in Array	Medium
1989	Minimum XOR Sum of Two Arrays	Hard
1990	Get Biggest Three Rhombus Sums in a Grid	Medium
1991	League Statistics	Medium
1992	Sort Linked List Already Sorted Using Absolute Values	Medium
1993	Sum of All Subset XOR Totals	Easy
1994	Minimum Number of Swaps to Make the Binary String Alternating	Medium
1995	Finding Pairs With a Certain Sum	Medium
1996	Number of Ways to Rearrange Sticks With K Sticks Visible	Hard
1997	Next Palindrome Using Same Digits	Hard
1998	Suspicious Bank Accounts	Medium
1999	Longer Contiguous Segments of Ones than Zeros	Easy
2000	Minimum Speed to Arrive on Time	Medium
2001	Jump Game VII	Medium
2002	Stone Game VIII	Hard
2003	Distinct Numbers in Each Subarray	Medium
2004	Convert Date Format	Easy
2005	Check if All the Integers in a Range Are Covered	Easy
2006	Find the Student that Will Replace the Chalk	Medium
2007	Maximum Cost of Trip With K Highways	Hard
2008	Minimum Cost to Change the Final Value of Expression	Hard
2009	Longest Word With All Prefixes	Medium
2010	Check if Word Equals Summation of Two Words	Easy
2011	Maximum Value after Insertion	Medium
2012	Process Tasks Using Servers	Medium
2013	Minimum Skips to Arrive at Meeting On Time	Hard
2014	Orders With Maximum Quantity Above Average	Medium
2015	Determine Whether Matrix Can Be Obtained By Rotation	Easy
2016	Reduction Operations to Make the Array Elements Equal	Medium
2017	Minimum Number of Flips to Make the Binary String Alternating	Medium
2018	Minimum Space Wasted From Packaging	Hard
2019	Product of Two Run-Length Encoded Arrays	Medium
2020	Remove One Element to Make the Array Strictly Increasing	Easy
2021	Remove All Occurrences of a Substring	Medium
2022	Maximum Alternating Subsequence Sum	Medium
2023	Design Movie Rental System	Hard
2024	Calculate Special Bonus	Easy
2025	Redistribute Characters to Make All Strings Equal	Easy
2026	Merge Triplets to Form Target Triplet	Medium
2027	Maximum Number of Removable Characters	Medium
2028	The Earliest and Latest Rounds Where Players Compete	Hard
2029	Minimize Product Sum of Two Arrays	Medium
2030	Group Employees of the Same Salary	Medium
2031	Egg Drop With 2 Eggs and N Floors	Medium
2032	Largest Odd Number in String	Easy
2033	The Number of Full Rounds You Have Played	Medium
2034	Minimum Absolute Difference Queries	Medium
2035	Count Sub Islands	Medium
2036	Count Pairs in Two Arrays	Medium
2037	Count Square Sum Triples	Easy
2038	Nearest Exit from Entrance in Maze	Medium
2039	Sum Game	Medium
2040	Minimum Cost to Reach Destination in Time	Hard
2041	The Latest Login in 2020	Easy
2042	Maximum Product Difference Between Two Pairs	Easy
2043	Cyclically Rotating a Grid	Medium
2044	Number of Wonderful Substrings	Medium
2045	Cutting Ribbons	Medium
2046	Page Recommendations II	Hard
2047	Find a Peak Element II	Medium
2048	Build Array from Permutation	Easy
2049	Eliminate Maximum Number of Monsters	Medium
2050	Count Good Numbers	Medium
2051	Longest Common Subpath	Hard
2052	Depth of BST Given Insertion Order	Medium
2053	Check if All Characters Have Equal Number of Occurrences	Easy
2054	The Number of the Smallest Unoccupied Chair	Medium
2055	Describe the Painting	Medium
2057	Count Salary Categories	Medium
2058	Concatenation of Array	Easy
2059	Unique Length-3 Palindromic Subsequences	Medium
2060	Merge BSTs to Create Single BST	Hard
2061	Painting a Grid With Three Different Colors	Hard
2062	Game of Nim	Medium
2063	Leetcodify Friends Recommendations	Hard
2064	Leetcodify Similar Friends	Hard
2066	Add Minimum Number of Rungs	Medium
2067	Maximum Number of Points with Cost	Medium
2068	Maximum Genetic Difference Query	Hard
2069	Kth Smallest Subarray Sum	Medium
2070	Check if String Is Decomposable Into Value-Equal Substrings	Easy
2071	Longest Common Subsequence Between Sorted Arrays	Medium
2072	Maximum of Minimum Values in All Subarrays	Medium
2073	Minimum Time For K Virus Variants to Spread	Hard
2074	Erect the Fence II	Hard
2075	Brightest Position on Street	Medium
2076	Sum of Digits of String After Convert	Easy
2077	Largest Number After Mutating Substring	Medium
2078	Maximum Compatibility Score Sum	Medium
2079	Delete Duplicate Folders in System	Hard
2080	Check if Move is Legal	Medium
2081	Minimum Total Space Wasted With K Resizing Operations	Medium
2082	Minimum Cost to Separate Sentence Into Rows	Medium
2083	Three Divisors	Easy
2084	Maximum Number of Weeks for Which You Can Work	Medium
2085	Array With Elements Not Equal to Average of Neighbors	Medium
2086	Count Number of Special Subsequences	Hard
2087	Confirmation Rate	Medium
2088	Minimum Time to Type Word Using Special Typewriter	Easy
2089	Maximum Matrix Sum	Medium
2090	Number of Ways to Arrive at Destination	Medium
2091	Number of Ways to Separate Numbers	Hard
2092	Users That Actively Request Confirmation Messages	Easy
2093	Check If String Is a Prefix of Array	Easy
2094	Remove Stones to Minimize the Total	Medium
2095	Minimum Number of Swaps to Make the String Balanced	Medium
2096	Find the Longest Valid Obstacle Course at Each Position	Hard
2097	Strong Friendship	Medium
2098	All the Pairs With the Maximum Number of Common Followers	Medium
2099	Number of Strings That Appear as Substrings in Word	Easy
2100	Minimum Non-Zero Product of the Array Elements	Medium
2101	Last Day Where You Can Still Cross	Hard
2102	Find the Middle Index in Array	Easy
2103	Find All Groups of Farmland	Medium
2104	Operations on Tree	Medium
2105	The Number of Good Subsets	Hard
2106	Find Greatest Common Divisor of Array	Easy
2107	Find Unique Binary String	Medium
2108	Minimize the Difference Between Target and Chosen Elements	Medium
2109	Find Array Given Subset Sums	Hard
2110	Employees With Missing Information	Easy
2111	Binary Searchable Numbers in an Unsorted Array	Medium
2112	Minimum Difference Between Highest and Lowest of K Scores	Easy
2113	Find the Kth Largest Integer in the Array	Medium
2114	Minimum Number of Work Sessions to Finish the Tasks	Medium
2115	Number of Unique Good Subsequences	Hard
2116	Count Number of Pairs With Absolute Difference K	Easy
2117	Find Original Array From Doubled Array	Medium
2118	Maximum Earnings From Taxi	Medium
2119	Minimum Number of Operations to Make Array Continuous	Hard
2120	First and Last Call On the Same Day	Hard
2121	Find if Path Exists in Graph	Easy
2122	Count Special Quadruplets	Easy
2123	The Number of Weak Characters in the Game	Medium
2124	First Day Where You Have Been in All the Rooms	Medium
2125	GCD Sort of an Array	Hard
2126	Count Nodes Equal to Sum of Descendants	Medium
2127	Employees Whose Manager Left the Company	Easy
2128	Reverse Prefix of Word	Easy
2129	Number of Pairs of Interchangeable Rectangles	Medium
2130	Maximum Product of the Length of Two Palindromic Subsequences	Medium
2131	Smallest Missing Genetic Value in Each Subtree	Hard
2132	Convert 1D Array Into 2D Array	Easy
2133	Number of Pairs of Strings With Concatenation Equal to Target	Medium
2134	Maximize the Confusion of an Exam	Medium
2135	Maximum Number of Ways to Partition an Array	Hard
2136	Find Cutoff Score for Each School	Medium
2137	Final Value of Variable After Performing Operations	Easy
2138	Sum of Beauty in the Array	Medium
2139	Detect Squares	Medium
2140	Longest Subsequence Repeated k Times	Hard
2141	Smallest Greater Multiple Made of Two Digits	Medium
2142	Average Height of Buildings in Each Segment	Medium
2143	Count the Number of Experiments	Medium
2144	Maximum Difference Between Increasing Elements	Easy
2145	Grid Game	Medium
2146	Check if Word Can Be Placed In Crossword	Medium
2147	The Score of Students Solving Math Expression	Hard
2148	Minimum Number of Moves to Seat Everyone	Easy
2149	Remove Colored Pieces if Both Neighbors are the Same Color	Medium
2150	Kth Smallest Product of Two Sorted Arrays	Hard
2151	The Time When the Network Becomes Idle	Medium
2152	The Number of Seniors and Juniors to Join the Company	Hard
2153	Subtree Removal Game with Fibonacci Tree	Hard
2154	Minimum Moves to Convert String	Easy
2155	Find Missing Observations	Medium
2156	Stone Game IX	Medium
2157	Smallest K-Length Subsequence With Occurrences of a Letter	Hard
2158	The Number of Seniors and Juniors to Join the Company II	Hard
2159	Two Out of Three	Easy
2160	Minimum Operations to Make a Uni-Value Grid	Medium
2161	Stock Price Fluctuation	Medium
2162	Partition Array Into Two Arrays to Minimize Sum Difference	Hard
2163	Kth Distinct String in an Array	Easy
2164	Two Best Non-Overlapping Events	Medium
2165	Plates Between Candles	Medium
2166	Number of Valid Move Combinations On Chessboard	Hard
2167	Number of Accounts That Did Not Stream	Medium
2168	Check if Numbers Are Ascending in a Sentence	Easy
2169	Simple Bank System	Medium
2170	Count Number of Maximum Bitwise-OR Subsets	Medium
2171	Second Minimum Time to Reach Destination	Hard
2172	Low-Quality Problems	Easy
2173	Number of Valid Words in a Sentence	Easy
2174	Next Greater Numerically Balanced Number	Medium
2175	Count Nodes With the Highest Score	Medium
2176	Parallel Courses III	Hard
2177	Check Whether Two Strings are Almost Equivalent	Easy
2178	Walking Robot Simulation II	Medium
2179	Most Beautiful Item for Each Query	Medium
2180	Maximum Number of Tasks You Can Assign	Hard
2181	Smallest Index With Equal Value	Easy
2182	Find the Minimum and Maximum Number of Nodes Between Critical Points	Medium
2183	Minimum Operations to Convert Number	Medium
2184	Check if an Original String Exists Given Two Encoded Strings	Hard
2185	Accepted Candidates From the Interviews	Medium
2186	Count Vowel Substrings of a String	Easy
2187	Vowels of All Substrings	Medium
2188	Minimized Maximum of Products Distributed to Any Store	Medium
2189	Maximum Path Quality of a Graph	Hard
2190	Count Common Words With One Occurrence	Easy
2191	Minimum Number of Buckets Required to Collect Rainwater from Houses	Medium
2192	Minimum Cost Homecoming of a Robot in a Grid	Medium
2193	Count Fertile Pyramids in a Land	Hard
2194	The Category of Each Member in the Store	Medium
2195	Time Needed to Buy Tickets	Easy
2196	Reverse Nodes in Even Length Groups	Medium
2197	Decode the Slanted Ciphertext	Medium
2198	Process Restricted Friend Requests	Hard
2199	Two Furthest Houses With Different Colors	Easy
2200	Stamping the Grid	Hard
2201	Valid Arrangement of Pairs	Hard
2202	Sum of k-Mirror Numbers	Hard
2203	Number of Spaces Cleaning Robot Cleaned	Medium
2204	Find Subsequence of Length K With the Largest Sum	Easy
2205	Find Good Days to Rob the Bank	Medium
2206	Detonate the Maximum Bombs	Medium
2207	Sequentially Ordinal Rank Tracker	Hard
2208	Account Balance	Medium
2209	Number of Equal Count Substrings	Medium
2210	Find Target Indices After Sorting Array	Easy
2211	K Radius Subarray Averages	Medium
2212	Removing Minimum and Maximum From Array	Medium
2213	Find All People With Secret	Hard
2214	The Winner University	Easy
2215	Finding 3-Digit Even Numbers	Easy
2216	Delete the Middle Node of a Linked List	Medium
2217	Step-By-Step Directions From a Binary Tree Node to Another	Medium
2218	Paths in Maze That Lead to Same Room	Medium
2219	Maximum Number of Words Found in Sentences	Easy
2220	Find All Possible Recipes from Given Supplies	Medium
2221	Check if a Parentheses String Can Be Valid	Medium
2222	Abbreviating the Product of a Range	Hard
2223	The Number of Rich Customers	Easy
2224	Drop Type 1 Orders for Customers With Type 0 Orders	Medium
2225	Substrings That Begin and End With the Same Letter	Medium
2226	Rings and Rods	Easy
2227	Sum of Subarray Ranges	Medium
2228	Watering Plants II	Medium
2229	Maximum Fruits Harvested After at Most K Steps	Hard
2230	Minimum Cost to Reach City With Discounts	Medium
2231	Find First Palindromic String in the Array	Easy
2232	Adding Spaces to a String	Medium
2233	Number of Smooth Descent Periods of a Stock	Medium
2234	Minimum Operations to Make the Array K-Increasing	Hard
2235	Capitalize the Title	Easy
2236	Maximum Twin Sum of a Linked List	Medium
2237	Longest Palindrome by Concatenating Two Letter Words	Medium
2238	A Number After a Double Reversal	Easy
2239	Execution of All Suffix Instructions Staying in a Grid	Medium
2240	Intervals Between Identical Elements	Medium
2241	Recover the Original Array	Hard
2242	Subsequence of Size K With the Largest Even Sum	Medium
2243	Check if All A's Appears Before All B's	Easy
2244	Number of Laser Beams in a Bank	Medium
2245	Destroying Asteroids	Medium
2246	Maximum Employees to Be Invited to a Meeting	Hard
2247	Number of Unique Flavors After Sharing K Candies	Medium
2248	Minimum Cost of Buying Candies With Discount	Easy
2249	Count the Hidden Sequences	Medium
2250	K Highest Ranked Items Within a Price Range	Medium
2251	Number of Ways to Divide a Long Corridor	Hard
2252	The Airport With the Most Traffic	Medium
2253	Build the Equation	Hard
2254	Check if Every Row and Column Contains All Numbers	Easy
2255	Minimum Swaps to Group All 1's Together II	Medium
2256	Count Words Obtained After Adding a Letter	Medium
2257	Earliest Possible Day of Full Bloom	Hard
2258	Elements in Array After Removing and Replacing Elements	Medium
2259	Minimum Operations to Remove Adjacent Ones in Matrix	Hard
2260	Divide a String Into Groups of Size k	Easy
2261	All Divisions With the Highest Score of a Binary Array	Medium
2262	Solving Questions With Brainpower	Medium
2263	Maximum Running Time of N Computers	Hard
2264	Minimum Sum of Four Digit Number After Splitting Digits	Easy
2265	Partition Array According to Given Pivot	Medium
2266	Minimum Cost to Set Cooking Time	Medium
2267	Minimum Difference in Sums After Removal of Elements	Hard
2268	Remove All Ones With Row and Column Flips	Medium
2269	Count Elements With Strictly Smaller and Greater Elements	Easy
2270	Find All Lonely Numbers in the Array	Medium
2271	Rearrange Array Elements by Sign	Medium
2272	Maximum Good People Based on Statements	Hard
2273	Pour Water Between Buckets to Make Water Levels Equal	Medium
2274	Keep Multiplying Found Values by Two	Easy
2275	Find Substring With Given Hash Value	Hard
2276	Groups of Strings	Hard
2277	Count Equal and Divisible Pairs in an Array	Easy
2278	Find Three Consecutive Integers That Sum to a Given Number	Medium
2279	Maximum Split of Positive Even Integers	Medium
2280	Count Good Triplets in an Array	Hard
2281	The Number of Passengers in Each Bus I	Medium
2282	Choose Numbers From Two Arrays in Range	Hard
2283	Sort Even and Odd Indices Independently	Easy
2284	Smallest Value of the Rearranged Number	Medium
2285	Design Bitset	Medium
2286	Minimum Time to Remove All Cars Containing Illegal Goods	Hard
2287	Minimum Number of Lines to Cover Points	Medium
2288	Count Operations to Obtain Zero	Easy
2289	Minimum Operations to Make the Array Alternating	Medium
2290	Removing Minimum Number of Magic Beans	Medium
2291	Maximum AND Sum of Array	Hard
2292	Counting Words With a Given Prefix	Easy
2293	Minimum Number of Steps to Make Two Strings Anagram II	Medium
2294	Minimum Time to Complete Trips	Medium
2295	Minimum Time to Finish the Race	Hard
2296	The Number of Passengers in Each Bus II	Hard
2297	Amount of New Area Painted Each Day	Hard
2298	Count Integers With Even Digit Sum	Easy
2299	Merge Nodes in Between Zeros	Medium
2300	Construct String With Repeat Limit	Medium
2301	Count Array Pairs Divisible by K	Hard
2302	Order Two Columns Independently	Medium
2303	Unique Substrings With Equal Digit Frequency	Medium
2304	Cells in a Range on an Excel Sheet	Easy
2305	Append K Integers With Minimal Sum	Medium
2306	Create Binary Tree From Descriptions	Medium
2307	Replace Non-Coprime Numbers in Array	Hard
2308	Divide Array Into Equal Pairs	Easy
2309	Maximize Number of Subsequences in a String	Medium
2310	Minimum Operations to Halve Array Sum	Medium
2311	Minimum White Tiles After Covering With Carpets	Hard
2312	Most Frequent Number Following Key In an Array	Easy
2313	Longest Winning Streak	Hard
2314	Remove All Ones With Row and Column Flips II	Medium
2315	The Change in Global Rankings	Medium
2316	Count Hills and Valleys in an Array	Easy
2317	Count Collisions on a Road	Medium
2318	Maximum Points in an Archery Competition	Medium
2319	Longest Substring of One Repeating Character	Hard
2320	Find All K-Distant Indices in an Array	Easy
2321	Minimum Weighted Subgraph With the Required Paths	Hard
2322	Number of Ways to Build Sturdy Brick Wall	Medium
2323	Minimum Bit Flips to Convert Number	Easy
2324	Find Triangular Sum of an Array	Medium
2325	Number of Ways to Select Buildings	Medium
2326	Sum of Scores of Built Strings	Hard
2327	Largest Number After Digit Swaps by Parity	Easy
2328	Minimize Result by Adding Parentheses to Expression	Medium
2329	Maximum Product After K Increments	Medium
2330	Maximum Total Beauty of the Gardens	Hard
2331	Intersection of Multiple Arrays	Easy
2332	Count Lattice Points Inside a Circle	Medium
2333	Count Number of Rectangles Containing Each Point	Medium
2334	Number of Flowers in Full Bloom	Hard
2335	Finding the Topic of Each Post	Hard
2336	The Number of Users That Are Eligible for Discount	Easy
2337	Remove Digit From Number to Maximize Result	Easy
2338	Minimum Consecutive Cards to Pick Up	Medium
2339	K Divisible Elements Subarrays	Medium
2340	Total Appeal of A String	Hard
2341	Count Prefixes of a Given String	Easy
2342	Minimum Average Difference	Medium
2343	Count Unguarded Cells in the Grid	Medium
2344	Escape the Spreading Fire	Hard
2345	Minimum Number of Operations to Convert Time	Easy
2346	Largest 3-Same-Digit Number in String	Easy
2347	Count Nodes Equal to Average of Subtree	Medium
2348	Count Number of Texts	Medium
2349	Check if There Is a Valid Parentheses String Path	Hard
2350	Find Closest Number to Zero	Easy
2351	Number of Ways to Buy Pens and Pencils	Medium
2352	Design an ATM Machine	Medium
2353	Maximum Score of a Node Sequence	Hard
2354	Minimum Health to Beat Game	Medium
2355	Maximum Consecutive Floors Without Special Floors	Medium
2356	Largest Combination With Bitwise AND Greater Than Zero	Medium
2357	Count Integers in Intervals	Hard
2358	Number of Ways to Split Array	Medium
2359	Maximum White Tiles Covered by a Carpet	Medium
2360	Substring With Largest Variance	Hard
2361	Calculate Digit Sum of a String	Easy
2362	Minimum Rounds to Complete All Tasks	Medium
2363	Maximum Trailing Zeros in a Cornered Path	Medium
2364	Longest Path With Different Adjacent Characters	Hard
2369	Maximum Sum Score of Array	Medium
2370	Users With Two Purchases Within Seven Days	Medium
2371	The Users That Are Eligible for Discount	Easy
2376	Number of Times a Driver Was a Passenger	Medium
2381	Dynamic Pivoting of a Table	Hard
2382	Dynamic Unpivoting of a Table	Hard
2383	Add Two Integers	Easy
2384	Root Equals Sum of Children	Easy
2385	Count Positions on Street With Required Brightness	Medium
2396	Design Video Sharing Platform	Hard
2405	Minimum Number of Keypresses	Medium