solutions.md

#	Title	Difficulty	Solution
1	Two Sum	Easy	Go
2	Add Two Numbers	Medium	Go
3	Longest Substring Without Repeating Characters	Medium	Go
4	Median of Two Sorted Arrays	Hard	Go
5	Longest Palindromic Substring	Medium	Go
6	ZigZag Conversion	Medium	Go
7	Reverse Integer	Easy	Go
8	String to Integer (atoi)	Medium	Go
9	Palindrome Number	Easy	Go
10	Regular Expression Matching	Hard	Go
11	Container With Most Water	Medium	Go
12	Integer to Roman	Medium	Go
13	Roman to Integer	Easy	Go
14	Longest Common Prefix	Easy	Go
15	3Sum	Medium	Go
16	3Sum Closest	Medium	Go
17	Letter Combinations of a Phone Number	Medium	Go
18	4Sum	Medium	Go
19	Remove Nth Node From End of List	Medium	Go
20	Valid Parentheses	Easy	Go
21	Merge Two Sorted Lists	Easy	Go
22	Generate Parentheses	Medium	Go
23	Merge k Sorted Lists	Hard	Go
24	Swap Nodes in Pairs	Medium	Go
25	Reverse Nodes in k-Group	Hard
26	Remove Duplicates from Sorted Array	Easy	Go
27	Remove Element	Easy	Go
28	Implement strStr()	Easy	Go
29	Divide Two Integers	Medium	Go
30	Substring with Concatenation of All Words	Hard
31	Next Permutation	Medium
32	Longest Valid Parentheses	Hard
33	Search in Rotated Sorted Array	Medium	Go
34	Find First and Last Position of Element in Sorted Array	Medium	Go
35	Search Insert Position	Easy
36	Valid Sudoku	Medium	Go
37	Sudoku Solver	Hard
38	Count and Say	Medium	Go
39	Combination Sum	Medium
40	Combination Sum II	Medium
41	First Missing Positive	Hard	Go
42	Trapping Rain Water	Hard	Go
43	Multiply Strings	Medium
44	Wildcard Matching	Hard	Go
45	Jump Game II	Hard
46	Permutations	Medium	Go
47	Permutations II	Medium
48	Rotate Image	Medium	Go
49	Group Anagrams	Medium	Go
50	Pow(x, n)	Medium	Go
51	N-Queens	Hard
52	N-Queens II	Hard
53	Maximum Subarray	Easy	Go
54	Spiral Matrix	Medium	Go
55	Jump Game	Medium	Go
56	Merge Intervals	Medium	Go
57	Insert Interval	Medium
58	Length of Last Word	Easy
59	Spiral Matrix II	Medium
60	Permutation Sequence	Hard
61	Rotate List	Medium	Go
62	Unique Paths	Medium	Go
63	Unique Paths II	Medium
64	Minimum Path Sum	Medium
65	Valid Number	Hard
66	Plus One	Easy	Go
67	Add Binary	Easy
68	Text Justification	Hard
69	Sqrt(x)	Easy	Go
70	Climbing Stairs	Easy	Go
71	Simplify Path	Medium
72	Edit Distance	Hard
73	Set Matrix Zeroes	Medium	Go
74	Search a 2D Matrix	Medium
75	Sort Colors	Medium	Go
76	Minimum Window Substring	Hard	Go
77	Combinations	Medium
78	Subsets	Medium	Go
79	Word Search	Medium	Go
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	Go
85	Maximal Rectangle	Hard
86	Partition List	Medium	Go
87	Scramble String	Hard
88	Merge Sorted Array	Easy	Go
89	Gray Code	Medium
90	Subsets II	Medium
91	Decode Ways	Medium	Go
92	Reverse Linked List II	Medium
93	Restore IP Addresses	Medium
94	Binary Tree Inorder Traversal	Medium	Go
95	Unique Binary Search Trees II	Medium	Go
96	Unique Binary Search Trees	Medium	Go
97	Interleaving String	Hard
98	Validate Binary Search Tree	Medium	Go
99	Recover Binary Search Tree	Hard	Go
100	Same Tree	Easy	Go
101	Symmetric Tree	Easy	Go
102	Binary Tree Level Order Traversal	Medium	Go
103	Binary Tree Zigzag Level Order Traversal	Medium	Go
104	Maximum Depth of Binary Tree	Easy	Go
105	Construct Binary Tree from Preorder and Inorder Traversal	Medium	Go
106	Construct Binary Tree from Inorder and Postorder Traversal	Medium	Go
107	Binary Tree Level Order Traversal II	Medium	Go
108	Convert Sorted Array to Binary Search Tree	Easy	Go
109	Convert Sorted List to Binary Search Tree	Medium
110	Balanced Binary Tree	Easy	Go
111	Minimum Depth of Binary Tree	Easy	Go
112	Path Sum	Easy	Go
113	Path Sum II	Medium	Go
114	Flatten Binary Tree to Linked List	Medium	Go
115	Distinct Subsequences	Hard
116	Populating Next Right Pointers in Each Node	Medium	Go
117	Populating Next Right Pointers in Each Node II	Medium	Go
118	Pascal's Triangle	Easy	Go
119	Pascal's Triangle II	Easy
120	Triangle	Medium
121	Best Time to Buy and Sell Stock	Easy	Go
122	Best Time to Buy and Sell Stock II	Easy	Go
123	Best Time to Buy and Sell Stock III	Hard
124	Binary Tree Maximum Path Sum	Hard	Go
125	Valid Palindrome	Easy	Go
126	Word Ladder II	Hard
127	Word Ladder	Hard	Go
128	Longest Consecutive Sequence	Medium	Go
129	Sum Root to Leaf Numbers	Medium	Go
130	Surrounded Regions	Medium	Go
131	Palindrome Partitioning	Medium	Go
132	Palindrome Partitioning II	Hard
133	Clone Graph	Medium
134	Gas Station	Medium	Go
135	Candy	Hard
136	Single Number	Easy	Go
137	Single Number II	Medium
138	Copy List with Random Pointer	Medium	Go
139	Word Break	Medium	Go
140	Word Break II	Hard
141	Linked List Cycle	Easy	Go
142	Linked List Cycle II	Medium
143	Reorder List	Medium
144	Binary Tree Preorder Traversal	Medium	Go
145	Binary Tree Postorder Traversal	Medium	Go
146	LRU Cache	Medium	Go
147	Insertion Sort List	Medium
148	Sort List	Medium	Go
149	Max Points on a Line	Hard
150	Evaluate Reverse Polish Notation	Medium	Go
151	Reverse Words in a String	Medium
152	Maximum Product Subarray	Medium	Go
153	Find Minimum in Rotated Sorted Array	Medium
154	Find Minimum in Rotated Sorted Array II	Hard
155	Min Stack	Easy	Go
160	Intersection of Two Linked Lists	Easy	Go
162	Find Peak Element	Medium	Go
164	Maximum Gap	Hard
165	Compare Version Numbers	Medium
166	Fraction to Recurring Decimal	Medium
167	Two Sum II - Input array is sorted	Easy
168	Excel Sheet Column Title	Easy
169	Majority Element	Easy	Go
171	Excel Sheet Column Number	Easy	Go
172	Factorial Trailing Zeroes	Easy	Go
173	Binary Search Tree Iterator	Medium	Go
174	Dungeon Game	Hard
175	Combine Two Tables	Easy
176	Second Highest Salary	Easy
177	Nth Highest Salary	Medium
178	Rank Scores	Medium
179	Largest Number	Medium	Go
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
187	Repeated DNA Sequences	Medium
188	Best Time to Buy and Sell Stock IV	Hard
189	Rotate Array	Medium	Go
190	Reverse Bits	Easy	Go
191	Number of 1 Bits	Easy	Go
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	Go
199	Binary Tree Right Side View	Medium	Go
200	Number of Islands	Medium	Go
201	Bitwise AND of Numbers Range	Medium
202	Happy Number	Easy	Go
203	Remove Linked List Elements	Easy
204	Count Primes	Easy	Go
205	Isomorphic Strings	Easy
206	Reverse Linked List	Easy	Go
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	Go
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	Go
223	Rectangle Area	Medium
224	Basic Calculator	Hard
225	Implement Stack using Queues	Easy
226	Invert Binary Tree	Easy	Go
227	Basic Calculator II	Medium
228	Summary Ranges	Easy
229	Majority Element II	Medium
230	Kth Smallest Element in a BST	Medium	Go
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	Go
236	Lowest Common Ancestor of a Binary Tree	Medium	Go
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
257	Binary Tree Paths	Easy	Go
258	Add Digits	Easy
260	Single Number III	Medium
262	Trips and Users	Hard
263	Ugly Number	Easy	Go
264	Ugly Number II	Medium	Go
268	Missing Number	Easy
273	Integer to English Words	Hard
274	H-Index	Medium
275	H-Index II	Medium
278	First Bad Version	Easy
279	Perfect Squares	Medium
282	Expression Add Operators	Hard	Go
283	Move Zeroes	Easy
284	Peeking Iterator	Medium
287	Find the Duplicate Number	Medium
289	Game of Life	Medium
290	Word Pattern	Easy
292	Nim Game	Easy
295	Find Median from Data Stream	Hard
297	Serialize and Deserialize Binary Tree	Hard	Go
299	Bulls and Cows	Medium
300	Longest Increasing Subsequence	Medium
301	Remove Invalid Parentheses	Hard
303	Range Sum Query - Immutable	Easy
304	Range Sum Query 2D - Immutable	Medium
306	Additive Number	Medium
307	Range Sum Query - Mutable	Medium
309	Best Time to Buy and Sell Stock with Cooldown	Medium
310	Minimum Height Trees	Medium
312	Burst Balloons	Hard
313	Super Ugly Number	Medium
315	Count of Smaller Numbers After Self	Hard
316	Remove Duplicate Letters	Medium
318	Maximum Product of Word Lengths	Medium
319	Bulb Switcher	Medium
321	Create Maximum Number	Hard
322	Coin Change	Medium
324	Wiggle Sort II	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	Medium
334	Increasing Triplet Subsequence	Medium
335	Self Crossing	Hard
336	Palindrome Pairs	Hard
337	House Robber III	Medium	Go
338	Counting Bits	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
347	Top K Frequent Elements	Medium
349	Intersection of Two Arrays	Easy	Go
350	Intersection of Two Arrays II	Easy	Go
352	Data Stream as Disjoint Intervals	Hard
354	Russian Doll Envelopes	Hard
355	Design Twitter	Medium
357	Count Numbers with Unique Digits	Medium
363	Max Sum of Rectangle No Larger Than K	Hard
365	Water and Jug Problem	Medium
367	Valid Perfect Square	Easy
368	Largest Divisible Subset	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
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	Go
405	Convert a Number to Hexadecimal	Easy
406	Queue Reconstruction by Height	Medium
407	Trapping Rain Water II	Hard
409	Longest Palindrome	Easy
410	Split Array Largest Sum	Hard
412	Fizz Buzz	Easy
413	Arithmetic Slices	Medium
414	Third Maximum Number	Easy
415	Add Strings	Easy	Go
416	Partition Equal Subset Sum	Medium
417	Pacific Atlantic Water Flow	Medium
419	Battleships in a Board	Medium
420	Strong Password Checker	Hard
421	Maximum XOR of Two Numbers in an Array	Medium
423	Reconstruct Original Digits from English	Medium
424	Longest Repeating Character Replacement	Medium
429	N-ary Tree Level Order Traversal	Medium	Go
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	Go
438	Find All Anagrams in a String	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
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	Easy
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
466	Count The Repetitions	Hard
467	Unique Substrings in Wraparound String	Medium
468	Validate IP Address	Medium
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
485	Max Consecutive Ones	Easy
486	Predict the Winner	Medium
488	Zuma Game	Hard
489	Kth Smallest Instructions	Hard
491	Increasing Subsequences	Medium
492	Construct the Rectangle	Easy
493	Reverse Pairs	Hard
494	Target Sum	Medium
495	Teemo Attacking	Medium
496	Next Greater Element I	Easy
498	Diagonal Traverse	Medium
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
506	Relative Ranks	Easy
507	Perfect Number	Easy
508	Most Frequent Subtree 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
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	Go
525	Contiguous Array	Medium
526	Beautiful Arrangement	Medium
528	Swapping Nodes in a Linked List	Medium
529	Minesweeper	Medium
530	Minimum Absolute Difference in BST	Easy
532	K-diff Pairs in an Array	Medium
535	Encode and Decode TinyURL	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
546	Remove Boxes	Hard
547	Number of Provinces	Medium
551	Student Attendance Record I	Easy
552	Student Attendance Record II	Hard
553	Optimal Division	Medium
554	Brick Wall	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
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
572	Subtree of Another Tree	Easy
575	Distribute Candies	Easy
576	Out of Boundary Paths	Medium
581	Shortest Unsorted Continuous Subarray	Medium
583	Delete Operation for Two Strings	Medium
587	Erect the Fence	Hard
590	N-ary Tree Postorder Traversal	Easy	Go
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
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
605	Can Place Flowers	Easy
606	Construct String from Binary Tree	Easy
609	Find Duplicate File in System	Medium
611	Valid Triangle Number	Medium
617	Merge Two Binary Trees	Easy
620	Not Boring Movies	Easy
621	Task Scheduler	Medium
623	Add One Row to Tree	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
632	Smallest Range Covering Elements from K Lists	Hard
633	Sum of Square Numbers	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
643	Maximum Average Subarray I	Easy
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
652	Find Duplicate Subtrees	Medium
653	Two Sum IV - Input is a BST	Easy
654	Maximum Binary Tree	Medium
655	Print Binary Tree	Medium
657	Robot Return to Origin	Easy
658	Find K Closest Elements	Medium
659	Split Array into Consecutive Subsequences	Medium
661	Image Smoother	Easy
662	Maximum Width of Binary Tree	Medium
664	Strange Printer	Hard
665	Non-decreasing Array	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
682	Baseball Game	Easy
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	Easy
691	Stickers to Spell Word	Hard
692	Top K Frequent Words	Medium
693	Binary Number with Alternating Bits	Easy
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
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
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	Easy
721	Accounts Merge	Medium
722	Remove Comments	Medium
724	Find Pivot Index	Easy
725	Split Linked List in Parts	Medium
726	Number of Atoms	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
735	Asteroid Collision	Medium
736	Parse Lisp Expression	Hard
738	Monotone Increasing Digits	Medium
739	Daily Temperatures	Medium
740	Delete and Earn	Medium
741	Cherry Pickup	Hard
742	To Lower Case	Easy
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
753	Open the Lock	Medium
754	Cracking the Safe	Hard
755	Reach a Number	Medium
757	Pyramid Transition Matrix	Medium
759	Set Intersection Size At Least Two	Hard
763	Special Binary String	Hard
764	N-ary Tree Level Order Traversal	Medium
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
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
787	Sliding Puzzle	Hard
789	Kth Largest Element in a Stream	Easy
790	Global and Local Inversions	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	Easy
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
819	Minimum Swaps To Make Sequences Increasing	Medium
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	Easy
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
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
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	Easy
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	Easy
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	Go
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	Easy
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
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
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
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
1078	Remove Outermost Parentheses	Easy
1079	Sum of Root To Leaf Binary Numbers	Easy
1080	Camelcase Matching	Medium
1081	Video Stitching	Medium
1086	Divisor Game	Easy
1087	Longest Arithmetic Subsequence	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
1103	Moving Stones Until Consecutive	Easy
1104	Coloring A Border	Medium
1105	Uncrossed Lines	Medium
1106	Escape a Large Maze	Hard
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
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
1127	Last Stone Weight	Easy
1128	Remove All Adjacent Duplicates In String	Easy
1129	Longest String Chain	Medium
1130	Last Stone Weight II	Medium
1133	Last Substring in Lexicographical Order	Hard
1137	Height Checker	Easy
1138	Grumpy Bookstore Owner	Medium
1139	Previous Permutation With One Swap	Medium
1140	Distant Barcodes	Medium
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
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
1168	Duplicate Zeros	Easy
1169	Largest Values From Labels	Medium
1170	Shortest Common Supersequence	Hard
1171	Shortest Path in Binary Matrix	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
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
1203	Print in Order	Easy
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
1210	Mean of Array After Removing Some Elements	Easy
1211	Iterator for Combination	Medium
1212	Sequential Digits	Medium
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
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
1234	Number of Paths with Max Score	Hard
1236	N-th Tribonacci Number	Easy
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
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
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
1267	Remove Zero Sum Consecutive Nodes from Linked List	Medium
1270	Dinner Plate Stacks	Hard
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
1279	Prime Arrangements	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
1293	Three Consecutive Odds	Easy
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
1304	Longest Happy String	Medium
1306	Minimum Absolute Difference	Easy
1307	Ugly Number III	Medium
1308	Smallest String With Swaps	Medium
1309	Sort Items by Groups Respecting Dependencies	Hard
1316	Fizz Buzz Multithreaded	Medium
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
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
1337	Design Skiplist	Hard
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
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
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
1367	Maximum Height by Stacking Cuboids	Hard
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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	Bulb Switcher III	Medium
1492	Time Needed to Inform All Employees	Medium
1493	Frog Position After T Seconds	Hard
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
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
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
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
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
1537	Maximum Score After Splitting a String	Easy
1538	Maximum Points You Can Obtain from Cards	Medium
1539	Diagonal Traverse II	Medium
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
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
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
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
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
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
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
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
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
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
1651	Shuffle String	Easy
1652	Bulb Switcher IV	Medium
1653	Number of Good Leaf Nodes Pairs	Medium
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	Hard
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
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
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
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
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 Deletion Cost to Avoid Repeating Letters	Medium
1701	Remove Max Number of Edges to Keep Graph Fully Traversable	Hard
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
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
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
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
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
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
1746	Largest Substring Between Two Equal Characters	Easy
1747	Lexicographically Smallest String After Applying Operations	Medium
1748	Best Team With No Conflicts	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
1760	Check Array Formation Through Concatenation	Easy
1761	Count Sorted Vowel Strings	Medium
1762	Furthest Building You Can Reach	Medium
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
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
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
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
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
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
1797	Goal Parser Interpretation	Easy
1798	Max Number of K-Sum Pairs	Medium
1799	Minimum Incompatibility	Hard
1800	Concatenation of Consecutive Binary Numbers	Medium
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
1812	Reformat Phone Number	Easy
1813	Maximum Erasure Value	Medium
1814	Jump Game VI	Medium
1815	Checking Existence of Edge Length Limited Paths	Hard
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
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
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
1839	Decode XORed Array	Easy
1840	Minimize Hamming Distance After Swap Operations	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
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
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
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
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
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
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