LeetCode

Author: github.com/lzl124631x

My C++ Code for LeetCode OJ.

Please give this repo a ⭐ if it inspires you. Thanks. 😊

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randomly picking a problem.

#	Title	Difficulty	Solution
1	Two Sum	Easy	Solution
2	Add Two Numbers	Medium	Solution
3	Longest Substring Without Repeating Characters	Medium	Solution
4	Median of Two Sorted Arrays	Hard	Solution
5	Longest Palindromic Substring	Medium	Solution
6	ZigZag Conversion	Medium	Solution
7	Reverse Integer	Easy	Solution
8	String to Integer (atoi)	Medium	Solution
9	Palindrome Number	Easy	Solution
10	Regular Expression Matching	Hard	Solution
11	Container With Most Water	Medium	Solution
12	Integer to Roman	Medium	Solution
13	Roman to Integer	Easy	Solution
14	Longest Common Prefix		Solution
15	3Sum	Medium	Solution
16	3Sum Closest	Medium	Solution
17	Letter Combinations of a Phone Number	Medium	Solution
18	4Sum	Medium	Solution
19	Remove Nth Node From End of List		Solution
20	Valid Parentheses	Easy	Solution
21	Merge Two Sorted Lists	Easy	Solution
22	Generate Parentheses	Medium	Solution
23	Merge k Sorted Lists	Hard	Solution
24	Swap Nodes in Pairs	Medium	Solution
25	Reverse Nodes in k-Group		Solution
26	Remove Duplicates from Sorted Array	Easy	Solution
27	Remove Element		Solution
28	Implement strStr()	Easy	Solution
29	Divide Two Integers	Medium	Solution
30	Substring with Concatenation of All Words		Solution
31	Next Permutation	Medium	Solution
32	Longest Valid Parentheses	Hard	Solution
33	Search in Rotated Sorted Array	Medium	Solution
34	Search for a Range		Solution
35	Search Insert Position	Easy	Solution
36	Valid Sudoku		Solution
38	Count and Say		Solution
39	Combination Sum	Medium	Solution
40	Combination Sum II	Medium	Solution
41	First Missing Positive	Hard	Solution
42	Trapping Rain Water	Hard	Solution
43	Multiply Strings		Solution
44	Wildcard Matching	Hard	Solution
45	Jump Game II	Hard	Solution
46	Permutations	Medium	Solution
47	Permutations II	Medium	Solution
48	Rotate Image		Solution
49	Group Anagrams	Medium	Solution
50	Pow(x, n)	Medium	Solution
53	Maximum Subarray	Easy	Solution
54	Spiral Matrix	Medium	Solution
55	Jump Game	Medium	Solution
57	Insert Interval	Hard	Solution
58	Length of Last Word	Easy	Solution
59	Spiral Matrix II	Medium	Solution
60	Permutation Sequence	Medium	Solution
61	Rotate List	Medium	Solution
62	Unique Paths	Medium	Solution
63	Unique Paths II	Medium	Solution
64	Minimum Path Sum	Medium	Solution
65	Valid Number	Hard	Solution
66	Plus One	Easy	Solution
67	Add Binary	Easy	Solution
69	Sqrt(x)		Solution
70	Climbing Stairs	Easy	Solution
71	Simplify Path		Solution
72	Edit Distance	Hard	Solution
74	Search a 2D Matrix	Medium	Solution
75	Sort Colors	Medium	Solution
76	Minimum Window Substring	Hard	Solution
77	Combinations	Medium	Solution
78	Subsets	Medium	Solution
79	Word Search	Medium	Solution
80	Remove Duplicates from Sorted Array II	Medium	Solution
81	Search in Rotated Sorted Array II	Medium	Solution
82	Remove Duplicates from Sorted List II	Medium	Solution
83	Remove Duplicates from Sorted List		Solution
84	Largest Rectangle in Histogram	Hard	Solution
85	Maximal Rectangle	Hard	Solution
86	Partition List	Medium	Solution
87	Scramble String	Hard	Solution
88	Merge Sorted Array	Easy	Solution
89	Gray Code	Medium	Solution
90	Subsets II	Medium	Solution
91	Decode Ways	Medium	Solution
92	Reverse Linked List II	Medium	Solution
93	Restore IP Addresses		Solution
94	Binary Tree Inorder Traversal	Medium	Solution
95	Unique Binary Search Trees II	Medium	Solution
96	Unique Binary Search Trees	Medium	Solution
97	Interleaving String	Hard	Solution
98	Validate Binary Search Tree	Medium	Solution
99	Recover Binary Search Tree	Hard	Solution
100	Same Tree	Easy	Solution
101	Symmetric Tree		Solution
102	Binary Tree Level Order Traversal	Medium	Solution
103	Binary Tree Zigzag Level Order Traversal	Medium	Solution
104	Maximum Depth of Binary Tree	Easy	Solution
106	Construct Binary Tree from Inorder and Postorder Traversal		Solution
107	Binary Tree Level Order Traversal II	Easy	Solution
108	Convert Sorted Array to Binary Search Tree		Solution
109	Convert Sorted List to Binary Search Tree		Solution
110	Balanced Binary Tree		Solution
111	Minimum Depth of Binary Tree	Easy	Solution
112	Path Sum		Solution
113	Path Sum II		Solution
114	Flatten Binary Tree to Linked List		Solution
115	Distinct Subsequences	Hard	Solution
116	Populating Next Right Pointers in Each Node	Medium	Solution
117	Populating Next Right Pointers in Each Node II	Medium	Solution
118	Pascal's Triangle	Easy	Solution
119	Pascal's Triangle II	Easy	Solution
121	Best Time to Buy and Sell Stock	Easy	Solution
122	Best Time to Buy and Sell Stock II	Easy	Solution
123	Best Time to Buy and Sell Stock III	Hard	Solution
124	Binary Tree Maximum Path Sum	Hard	Solution
125	Valid Palindrome	Easy	Solution
126	Word Ladder II		Solution
127	Word Ladder	Hard	Solution
128	Longest Consecutive Sequence	Hard	Solution
129	Sum Root to Leaf Numbers	Medium	Solution
130	Surrounded Regions	Medium	Solution
131	Palindrome Partitioning	Medium	Solution
133	Clone Graph	Medium	Solution
134	Gas Station	Medium	Solution
136	Single Number	Easy	Solution
137	Single Number II	Medium	Solution
138	Copy List with Random Pointer	Medium	Solution
139	Word Break	Medium	Solution
140	Word Break II	Hard	Solution
141	Linked List Cycle	Easy	Solution
142	Linked List Cycle II	Medium	Solution
143	Reorder List	Medium	Solution
144	Binary Tree Preorder Traversal	Medium	Solution
145	Binary Tree Postorder Traversal	Hard	Solution
146	LRU Cache	Hard	Solution
147	Insertion Sort List	Medium	Solution
148	Sort List	Medium	Solution
149	Max Points on a Line	Hard	Solution
150	Evaluate Reverse Polish Notation		Solution
151	Reverse Words in a String	Medium	Solution
152	Maximum Product Subarray	Medium	Solution
153	Find Minimum in Rotated Sorted Array	Medium	Solution
154	Find Minimum in Rotated Sorted Array II	Hard	Solution
155	Min Stack	Easy	Solution
156	Binary Tree Upside Down	Medium	Solution
157	Read N Characters Given Read4	Easy	Solution
158	Read N Characters Given Read4 II - Call multiple times	Hard	Solution
159	Longest Substring with At Most Two Distinct Characters	Hard	Solution
161	One Edit Distance	Medium	Solution
162	Find Peak Element	Medium	Solution
164	Maximum Gap		Solution
165	Compare Version Numbers	Medium	Solution
166	Fraction to Recurring Decimal		Solution
167	Two Sum II - Input array is sorted		Solution
169	Majority Element	Easy	Solution
171	Excel Sheet Column Number	Easy	Solution
173	Binary Search Tree Iterator	Medium	Solution
174	Dungeon Game	Hard	Solution
175	Combine Two Tables	Easy	Solution
176	Second Highest Salary	Easy	Solution
179	Largest Number	Medium	Solution
181	Employees Earning More Than Their Managers	Easy	Solution
182	Duplicate Emails	Easy	Solution
187	Repeated DNA Sequences		Solution
188	Best Time to Buy and Sell Stock IV	Hard	Solution
189	Rotate Array	Medium	Solution
190	Reverse Bits	Easy	Solution
191	Number of 1 Bits	Easy	Solution
195	Tenth Line	Easy	Solution
198	House Robber	Easy	Solution
199	Binary Tree Right Side View	Medium	Solution
200	Number of Islands	Medium	Solution
201	Bitwise AND of Numbers Range	Medium	Solution
202	Happy Number	Easy	Solution
203	Remove Linked List Elements	Easy	Solution
204	Count Primes	Easy	Solution
206	Reverse Linked List	Easy	Solution
207	Course Schedule	Medium	Solution
208	Implement Trie (Prefix Tree)	Medium	Solution
209	Minimum Size Subarray Sum	Medium	Solution
210	Course Schedule II	Medium	Solution
211	Add and Search Word - Data structure design	Medium	Solution
212	Word Search II	Hard	Solution
213	House Robber II	Medium	Solution
214	Shortest Palindrome	Hard	Solution
215	Kth Largest Element in an Array	Medium	Solution
216	Combination Sum III	Medium	Solution
218	The Skyline Problem	Hard	Solution
219	Contains Duplicate II	Easy	Solution
220	Contains Duplicate III	Medium	Solution
221	Maximal Square	Medium	Solution
222	Count Complete Tree Nodes	Medium	Solution
223	Rectangle Area		Solution
224	Basic Calculator	Hard	Solution
225	Implement Stack using Queues	Easy	Solution
226	Invert Binary Tree	Easy	Solution
227	Basic Calculator II	Medium	Solution
228	Summary Ranges	Easy	Solution
229	Majority Element II		Solution
230	Kth Smallest Element in a BST	Medium	Solution
231	Power of Two	Easy	Solution
232	Implement Queue using Stacks	Easy	Solution
234	Palindrome Linked List	Easy	Solution
237	Delete Node in a Linked List	Easy	Solution
238	Product of Array Except Self	Medium	Solution
239	Sliding Window Maximum	Hard	Solution
240	Search a 2D Matrix II	Medium	Solution
241	Different Ways to Add Parentheses	Medium	Solution
242	Valid Anagram	Easy	Solution
243	Shortest Word Distance	Easy	Solution
244	Shortest Word Distance II	Medium	Solution
246	Strobogrammatic Number	Easy	Solution
247	Strobogrammatic Number II	Medium	Solution
249	Group Shifted Strings	Medium	Solution
250	Count Univalue Subtrees	Medium	Solution
252	Meeting Rooms	Easy	Solution
253	Meeting Rooms II	Medium	Solution
256	Paint House	Easy	Solution
257	Binary Tree Paths	Easy	Solution
258	Add Digits	Easy	Solution
259	3Sum Smaller	Medium	Solution
260	Single Number III	Medium	Solution
261	Graph Valid Tree	Medium	Solution
263	Ugly Number		Solution
264	Ugly Number II	Medium	Solution
266	Palindrome Permutation	Easy	Solution
268	Missing Number	Easy	Solution
270	Closest Binary Search Tree Value	Easy	Solution
271	Encode and Decode Strings	Medium	Solution
274	H-Index	Medium	Solution
275	H-Index II	Medium	Solution
278	First Bad Version	Easy	Solution
279	Perfect Squares	Medium	Solution
280	Wiggle Sort	Medium	Solution
281	Zigzag Iterator	Medium	Solution
284	Peeking Iterator	Medium	Solution
285	Inorder Successor in BST	Medium	Solution
287	Find the Duplicate Number	Medium	Solution
289	Game of Life	Medium	Solution
290	Word Pattern	Easy	Solution
293	Flip Game	Easy	Solution
295	Find Median from Data Stream	Hard	Solution
297	Serialize and Deserialize Binary Tree	Hard	Solution
298	Binary Tree Longest Consecutive Sequence	Medium	Solution
299	Bulls and Cows	Easy	Solution
300	Longest Increasing Subsequence	Medium	Solution
301	Remove Invalid Parentheses	Hard	Solution
303	Range Sum Query - Immutable		Solution
304	Range Sum Query 2D - Immutable		Solution
307	Range Sum Query - Mutable	Medium	Solution
309	Best Time to Buy and Sell Stock with Cooldown	Medium	Solution
310	Minimum Height Trees	Medium	Solution
312	Burst Balloons	Hard	Solution
313	Super Ugly Number		Solution
315	Count of Smaller Numbers After Self	Hard	Solution
316	Remove Duplicate Letters	Hard	Solution
320	Generalized Abbreviation	Medium	Solution
321	Create Maximum Number	Hard	Solution
322	Coin Change		Solution
324	Wiggle Sort II		Solution
327	Count of Range Sum	Hard	Solution
328	Odd Even Linked List	Medium	Solution
329	Longest Increasing Path in a Matrix	Hard	Solution
330	Patching Array		Solution
331	Verify Preorder Serialization of a Binary Tree		Solution
332	Reconstruct Itinerary	Medium	Solution
333	Largest BST Subtree	Medium	Solution
334	Increasing Triplet Subsequence	Medium	Solution
335	Self Crossing		Solution
336	Palindrome Pairs	Hard	Solution
337	House Robber III	Medium	Solution
338	Counting Bits	Medium	Solution
339	Nested List Weight Sum	Easy	Solution
340	Longest Substring with At Most K Distinct Characters	Hard	Solution
341	Flatten Nested List Iterator	Medium	Solution
342	Power of Four	Easy	Solution
343	Integer Break	Medium	Solution
344	Reverse String	Easy	Solution
345	Reverse Vowels of a String	Easy	Solution
346	Moving Average from Data Stream	Easy	Solution
347	Top K Frequent Elements	Medium	Solution
348	Design Tic-Tac-Toe	Medium	Solution
349	Intersection of Two Arrays		Solution
350	Intersection of Two Arrays II		Solution
352	Data Stream as Disjoint Intervals		Solution
354	Russian Doll Envelopes	Hard	Solution
355	Design Twitter	Medium	Solution
357	Count Numbers with Unique Digits		Solution
359	Logger Rate Limiter	Easy	Solution
360	Sort Transformed Array	Medium	Solution
361	Bomb Enemy	Medium	Solution
363	Max Sum of Rectangle No Larger Than K	Hard	Solution
364	Nested List Weight Sum II	Medium	Solution
365	Water and Jug Problem		Solution
366	Find Leaves of Binary Tree	Medium	Solution
367	Valid Perfect Square	Easy	Solution
368	Largest Divisible Subset	Medium	Solution
369	Plus One Linked List	Medium	Solution
370	Range Addition	Medium	Solution
371	Sum of Two Integers	Easy	Solution
372	Super Pow		Solution
373	Find K Pairs with Smallest Sums		Solution
374	Guess Number Higher or Lower		Solution
375	Guess Number Higher or Lower II	Medium	Solution
376	Wiggle Subsequence	Medium	Solution
377	Combination Sum IV	Medium	Solution
378	Kth Smallest Element in a Sorted Matrix		Solution
379	Design Phone Directory	Medium	Solution
380	Insert Delete GetRandom O(1)	Medium	Solution
381	Insert Delete GetRandom O(1) - Duplicates allowed	Hard	Solution
382	Linked List Random Node	Medium	Solution
383	Ransom Note	Easy	Solution
384	Shuffle an Array		Solution
385	Mini Parser	Medium	Solution
386	Lexicographical Numbers	Medium	Solution
387	First Unique Character in a String	Easy	Solution
388	Longest Absolute File Path	Medium	Solution
389	Find the Difference	Easy	Solution
390	Elimination Game		Solution
391	Perfect Rectangle		Solution
392	Is Subsequence	Easy	Solution
393	UTF-8 Validation		Solution
394	Decode String		Solution
395	Longest Substring with At Least K Repeating Characters	Medium	Solution
396	Rotate Function	Medium	Solution
397	Integer Replacement		Solution
398	Random Pick Index		Solution
399	Evaluate Division	Medium	Solution
400	Nth Digit	Medium	Solution
401	Binary Watch		Solution
402	Remove K Digits	Medium	Solution
403	Frog Jump	Hard	Solution
404	Sum of Left Leaves	Easy	Solution
405	Convert a Number to Hexadecimal		Solution
406	Queue Reconstruction by Height	Medium	Solution
407	Trapping Rain Water II	Hard	Solution
408	Valid Word Abbreviation	Easy	Solution
409	Longest Palindrome	Easy	Solution
410	Split Array Largest Sum	Hard	Solution
412	Fizz Buzz	Easy	Solution
413	Arithmetic Slices	Medium	Solution
414	Third Maximum Number		Solution
415	Add Strings	Easy	Solution
416	Partition Equal Subset Sum	Medium	Solution
417	Pacific Atlantic Water Flow	Medium	Solution
419	Battleships in a Board		Solution
420	Strong Password Checker		Solution
421	Maximum XOR of Two Numbers in an Array	Medium	Solution
422	Valid Word Square	Easy	Solution
423	Reconstruct Original Digits from English		Solution
424	Longest Repeating Character Replacement		Solution
427	Construct Quad Tree	Easy	Solution
429	N-ary Tree Level Order Traversal	Easy	Solution
430	Flatten a Multilevel Doubly Linked List	Medium	Solution
432	All O`one Data Structure		Solution
434	Number of Segments in a String		Solution
435	Non-overlapping Intervals	Medium	Solution
436	Find Right Interval	Medium	Solution
437	Path Sum III	Medium	Solution
438	Find All Anagrams in a String	Medium	Solution
440	K-th Smallest in Lexicographical Order		Solution
441	Arranging Coins	Easy	Solution
442	Find All Duplicates in an Array	Medium	Solution
443	String Compression	Easy	Solution
445	Add Two Numbers II	Medium	Solution
446	Arithmetic Slices II - Subsequence	Hard	Solution
447	Number of Boomerangs		Solution
448	Find All Numbers Disappeared in an Array	Easy	Solution
449	Serialize and Deserialize BST		Solution
450	Delete Node in a BST	Medium	Solution
451	Sort Characters By Frequency	Medium	Solution
452	Minimum Number of Arrows to Burst Balloons	Medium	Solution
453	Minimum Moves to Equal Array Elements		Solution
454	4Sum II	Medium	Solution
455	Assign Cookies		Solution
456	132 Pattern	Medium	Solution
457	Circular Array Loop	Medium	Solution
459	Repeated Substring Pattern	Easy	Solution
460	LFU Cache		Solution
461	Hamming Distance	Easy	Solution
462	Minimum Moves to Equal Array Elements II		Solution
463	Island Perimeter	Easy	Solution
464	Can I Win		Solution
466	Count The Repetitions	Hard	Solution
467	Unique Substrings in Wraparound String		Solution
468	Validate IP Address	Medium	Solution
470	Implement Rand10() Using Rand7()	Medium	Solution
471	Encode String with Shortest Length	Hard	Solution
472	Concatenated Words	Hard	Solution
473	Matchsticks to Square	Medium	Solution
474	Ones and Zeroes	Medium	Solution
475	Heaters		Solution
476	Number Complement	Easy	Solution
477	Total Hamming Distance		Solution
478	Generate Random Point in a Circle	Medium	Solution
480	Sliding Window Median		Solution
481	Magical String		Solution
482	License Key Formatting		Solution
483	Smallest Good Base	Hard	Solution
485	Max Consecutive Ones		Solution
486	Predict the Winner	Medium	Solution
487	Max Consecutive Ones II		Solution
488	Zuma Game		Solution
489	Robot Room Cleaner	Hard	Solution
490	The Maze	Medium	Solution
491	Increasing Subsequences	Medium	Solution
492	Construct the Rectangle		Solution
494	Target Sum	Medium	Solution
495	Teemo Attacking	Medium	Solution
496	Next Greater Element I	Easy	Solution
497	Random Point in Non-overlapping Rectangles	Medium	Solution
498	Diagonal Traverse		Solution
500	Keyboard Row		Solution
501	Find Mode in Binary Search Tree		Solution
502	IPO		Solution
503	Next Greater Element II	Medium	Solution
504	Base 7		Solution
506	Relative Ranks		Solution
507	Perfect Number	Easy	Solution
508	Most Frequent Subtree Sum		Solution
509	Fibonacci Number	Easy	Solution
513	Find Bottom Left Tree Value	Medium	Solution
514	Freedom Trail	Hard	Solution
515	Find Largest Value in Each Tree Row		Solution
516	Longest Palindromic Subsequence	Medium	Solution
517	Super Washing Machines	Hard	Solution
518	Coin Change 2	Medium	Solution
519	Random Flip Matrix	Medium	Solution
520	Detect Capital	Easy	Solution
521	Longest Uncommon Subsequence I	Easy	Solution
523	Continuous Subarray Sum	Medium	Solution
524	Longest Word in Dictionary through Deleting		Solution
525	Contiguous Array	Medium	Solution
526	Beautiful Arrangement	Medium	Solution
528	Random Pick with Weight	Medium	Solution
529	Minesweeper		Solution
530	Minimum Absolute Difference in BST		Solution
532	K-diff Pairs in an Array	Easy	Solution
535	Encode and Decode TinyURL		Solution
536	Construct Binary Tree from String		Solution
537	Complex Number Multiplication	Medium	Solution
538	Convert BST to Greater Tree	Medium	Solution
539	Minimum Time Difference		Solution
540	Single Element in a Sorted Array	Medium	Solution
541	Reverse String II		Solution
542	01 Matrix		Solution
543	Diameter of Binary Tree	Easy	Solution
544	Output Contest Matches	Medium	Solution
546	Remove Boxes	Hard	Solution
547	Friend Circles	Medium	Solution
549	Binary Tree Longest Consecutive Sequence II		Solution
551	Student Attendance Record I	Easy	Solution
552	Student Attendance Record II	Hard	Solution
553	Optimal Division	Medium	Solution
554	Brick Wall	Medium	Solution
556	Next Greater Element III	Medium	Solution
557	Reverse Words in a String III		Solution
558	Quad Tree Intersection	Easy	Solution
559	Maximum Depth of N-ary Tree	Easy	Solution
560	Subarray Sum Equals K	Medium	Solution
561	Array Partition I		Solution
562	Longest Line of Consecutive One in Matrix		Solution
563	Binary Tree Tilt	Easy	Solution
565	Array Nesting	Medium	Solution
566	Reshape the Matrix	Easy	Solution
567	Permutation in String	Medium	Solution
570	Managers with at Least 5 Direct Reports	Medium	Solution
572	Subtree of Another Tree	Easy	Solution
575	Distribute Candies	Easy	Solution
576	Out of Boundary Paths	Medium	Solution
577	Employee Bonus	Easy	Solution
581	Shortest Unsorted Continuous Subarray	Medium	Solution
582	Kill Process	Medium	Solution
583	Delete Operation for Two Strings	Medium	Solution
584	Find Customer Referee	Easy	Solution
586	Customer Placing the Largest Number of Orders	Easy	Solution
589	N-ary Tree Preorder Traversal	Easy	Solution
590	N-ary Tree Postorder Traversal	Easy	Solution
591	Tag Validator	Hard	Solution
593	Valid Square	Medium	Solution
594	Longest Harmonious Subsequence	Easy	Solution
595	Big Countries	Easy	Solution
597	Friend Requests I: Overall Acceptance Rate	Easy	Solution
598	Range Addition II	Easy	Solution
599	Minimum Index Sum of Two Lists	Easy	Solution
600	Non-negative Integers without Consecutive Ones	Hard	Solution
603	Consecutive Available Seats	Easy	Solution
604	Design Compressed String Iterator	Easy	Solution
605	Can Place Flowers	Easy	Solution
606	Construct String from Binary Tree	Easy	Solution
607	Sales Person	Easy	Solution
609	Find Duplicate File in System	Medium	Solution
610	Triangle Judgement	Easy	Solution
611	Valid Triangle Number	Medium	Solution
613	Shortest Distance in a Line	Easy	Solution
616	Add Bold Tag in String	Medium	Solution
617	Merge Two Binary Trees	Easy	Solution
620	Not Boring Movies	Easy	Solution
621	Task Scheduler	Medium	Solution
622	Design Circular Queue	Medium	Solution
623	Add One Row to Tree	Medium	Solution
627	Swap Salary	Easy	Solution
628	Maximum Product of Three Numbers	Easy	Solution
629	K Inverse Pairs Array	Hard	Solution
632	Smallest Range Covering Elements from K Lists	Hard	Solution
636	Exclusive Time of Functions	Medium	Solution
637	Average of Levels in Binary Tree	Easy	Solution
638	Shopping Offers	Medium	Solution
639	Decode Ways II	Hard	Solution
640	Solve the Equation	Medium	Solution
641	Design Circular Deque	Medium	Solution
643	Maximum Average Subarray I	Easy	Solution
645	Set Mismatch	Easy	Solution
646	Maximum Length of Pair Chain	Medium	Solution
647	Palindromic Substrings	Medium	Solution
648	Replace Words	Medium	Solution
650	2 Keys Keyboard	Medium	Solution
651	4 Keys Keyboard	Medium	Solution
652	Find Duplicate Subtrees	Medium	Solution
653	Two Sum IV - Input is a BST	Easy	Solution
654	Maximum Binary Tree	Medium	Solution
655	Print Binary Tree	Medium	Solution
657	Robot Return to Origin	Easy	Solution
659	Split Array into Consecutive Subsequences	Medium	Solution
661	Image Smoother	Easy	Solution
662	Maximum Width of Binary Tree	Medium	Solution
663	Equal Tree Partition	Medium	Solution
664	Strange Printer	Hard	Solution
665	Non-decreasing Array	Easy	Solution
666	Path Sum IV	Medium	Solution
667	Beautiful Arrangement II	Medium	Solution
668	Kth Smallest Number in Multiplication Table	Hard	Solution
669	Trim a Binary Search Tree	Medium	Solution
670	Maximum Swap	Medium	Solution
671	Second Minimum Node In a Binary Tree	Easy	Solution
673	Number of Longest Increasing Subsequence	Medium	Solution
674	Longest Continuous Increasing Subsequence	Easy	Solution
676	Implement Magic Dictionary	Medium	Solution
677	Map Sum Pairs	Medium	Solution
678	Valid Parenthesis String	Medium	Solution
680	Valid Palindrome II	Easy	Solution
682	Baseball Game	Easy	Solution
684	Redundant Connection	Medium	Solution
686	Repeated String Match	Medium	Solution
687	Longest Univalue Path	Easy	Solution
688	Knight Probability in Chessboard	Medium	Solution
690	Employee Importance	Easy	Solution
691	Stickers to Spell Word	Hard	Solution
693	Binary Number with Alternating Bits	Easy	Solution
694	Number of Distinct Islands	Medium	Solution
695	Max Area of Island	Medium	Solution
696	Count Binary Substrings	Easy	Solution
697	Degree of an Array	Easy	Solution
698	Partition to K Equal Sum Subsets	Medium	Solution
699	Falling Squares	Hard	Solution
700	Search in a Binary Search Tree	Easy	Solution
701	Insert into a Binary Search Tree	Medium	Solution
702	Search in a Sorted Array of Unknown Size	Medium	Solution
703	Kth Largest Element in a Stream	Easy	Solution
704	Binary Search	Easy	Solution
705	Design HashSet	Easy	Solution
706	Design HashMap	Easy	Solution
707	Design Linked List	Easy	Solution
709	To Lower Case	Easy	Solution
712	Minimum ASCII Delete Sum for Two Strings	Medium	Solution
713	Subarray Product Less Than K	Medium	Solution
714	Best Time to Buy and Sell Stock with Transaction Fee	Medium	Solution
717	1-bit and 2-bit Characters	Easy	Solution
718	Maximum Length of Repeated Subarray	Medium	Solution
719	Find K-th Smallest Pair Distance	Hard	Solution
720	Longest Word in Dictionary	Easy	Solution
721	Accounts Merge	Medium	Solution
723	Candy Crush	Medium	Solution
724	Find Pivot Index	Easy	Solution
725	Split Linked List in Parts	Medium	Solution
726	Number of Atoms	Hard	Solution
728	Self Dividing Numbers	Easy	Solution
730	Count Different Palindromic Subsequences	Hard	Solution
733	Flood Fill	Easy	Solution
735	Asteroid Collision	Medium	Solution
739	Daily Temperatures	Medium	Solution
740	Delete and Earn	Medium	Solution
743	Network Delay Time	Medium	Solution
744	Find Smallest Letter Greater Than Target	Easy	Solution
745	Prefix and Suffix Search	Hard	Solution
746	Min Cost Climbing Stairs	Easy	Solution
747	Largest Number At Least Twice of Others	Easy	Solution
748	Shortest Completing Word	Easy	Solution
750	Number Of Corner Rectangles	Medium	Solution
751	IP to CIDR	Hard	Solution
752	Open the Lock	Medium	Solution
753	Cracking the Safe	Hard	Solution
754	Reach a Number	Easy	Solution
755	Pour Water	Medium	Solution
756	Pyramid Transition Matrix	Medium	Solution
757	Set Intersection Size At Least Two	Hard	Solution
760	Find Anagram Mappings	Easy	Solution
762	Prime Number of Set Bits in Binary Representation	Easy	Solution
763	Partition Labels	Medium	Solution
765	Couples Holding Hands	Hard	Solution
766	Toeplitz Matrix	Easy	Solution
767	Reorganize String	Medium	Solution
768	Max Chunks To Make Sorted II	Hard	Solution
769	Max Chunks To Make Sorted	Medium	Solution
770	Basic Calculator IV	Hard	Solution
771	Jewels and Stones	Easy	Solution
773	Sliding Puzzle	Hard	Solution
775	Global and Local Inversions	Medium	Solution
777	Swap Adjacent in LR String	Medium	Solution
780	Reaching Points	Hard	Solution
781	Rabbits in Forest	Medium	Solution
783	Minimum Distance Between BST Nodes	Medium	Solution
784	Letter Case Permutation	Easy	Solution
785	Is Graph Bipartite?	Medium	Solution
787	Cheapest Flights Within K Stops	Medium	Solution
788	Rotated Digits	Easy	Solution
791	Custom Sort String	Medium	Solution
793	Preimage Size of Factorial Zeroes Function	Hard	Solution
794	Valid Tic-Tac-Toe State	Medium	Solution
795	Number of Subarrays with Bounded Maximum	Medium	Solution
796	Rotate String	Easy	Solution
797	All Paths From Source to Target	Medium	Solution
798	Smallest Rotation with Highest Score	Hard	Solution
799	Champagne Tower	Medium	Solution
800	Similar RGB Color	Easy	Solution
801	Minimum Swaps To Make Sequences Increasing	Medium	Solution
802	Find Eventual Safe States	Medium	Solution
804	Unique Morse Code Words	Easy	Solution
805	Split Array With Same Average	Hard	Solution
806	Number of Lines To Write String	Easy	Solution
807	Max Increase to Keep City Skyline	Medium	Solution
809	Expressive Words	Medium	Solution
810	Chalkboard XOR Game	Hard	Solution
811	Subdomain Visit Count	Easy	Solution
812	Largest Triangle Area	Easy	Solution
813	Largest Sum of Averages	Medium	Solution
814	Binary Tree Pruning	Medium	Solution
817	Linked List Components	Medium	Solution
819	Most Common Word	Easy	Solution
820	Short Encoding of Words	Medium	Solution
821	Shortest Distance to a Character	Easy	Solution
823	Binary Trees With Factors	Medium	Solution
824	Goat Latin	Easy	Solution
825	Friends Of Appropriate Ages	Medium	Solution
826	Most Profit Assigning Work	Medium	Solution
827	Making A Large Island	Hard	Solution
828	Unique Letter String	Hard	Solution
829	Consecutive Numbers Sum	Hard	Solution
830	Positions of Large Groups	Easy	Solution
831	Masking Personal Information	Medium	Solution
832	Flipping an Image	Easy	Solution
835	Image Overlap	Medium	Solution
836	Rectangle Overlap	Easy	Solution
837	New 21 Game	Medium	Solution
839	Similar String Groups	Hard	Solution
840	Magic Squares In Grid	Easy	Solution
841	Keys and Rooms	Medium	Solution
843	Guess the Word	Hard	Solution
844	Backspace String Compare	Easy	Solution
845	Longest Mountain in Array	Medium	Solution
846	Hand of Straights	Medium	Solution
849	Maximize Distance to Closest Person	Medium	Solution
852	Peak Index in a Mountain Array	Easy	Solution
855	Exam Room	Medium	Solution
856	Score of Parentheses	Medium	Solution
857	Minimum Cost to Hire K Workers	Hard	Solution
858	Mirror Reflection	Medium	Solution
859	Buddy Strings	Easy	Solution
860	Lemonade Change	Easy	Solution
861	Score After Flipping Matrix	Medium	Solution
862	Shortest Subarray with Sum at Least K	Hard	Solution
863	All Nodes Distance K in Binary Tree	Medium	Solution
865	Smallest Subtree with all the Deepest Nodes	Medium	Solution
866	Prime Palindrome	Medium	Solution
867	Transpose Matrix	Easy	Solution
868	Binary Gap	Easy	Solution
869	Reordered Power of 2	Medium	Solution
870	Advantage Shuffle	Medium	Solution
872	Leaf-Similar Trees	Easy	Solution
874	Walking Robot Simulation	Easy	Solution
875	Koko Eating Bananas	Medium	Solution
876	Middle of the Linked List	Easy	Solution
877	Stone Game	Medium	Solution
880	Decoded String at Index	Medium	Solution
881	Boats to Save People	Medium	Solution
882	Reachable Nodes In Subdivided Graph	Hard	Solution
883	Projection Area of 3D Shapes	Easy	Solution
884	Uncommon Words from Two Sentences	Easy	Solution
885	Spiral Matrix III	Medium	Solution
886	Possible Bipartition	Medium	Solution
887	Super Egg Drop	Hard	Solution
888	Fair Candy Swap	Easy	Solution
889	Construct Binary Tree from Preorder and Postorder Traversal	Medium	Solution
890	Find and Replace Pattern	Medium	Solution
891	Sum of Subsequence Widths		Solution
892	Surface Area of 3D Shapes	Easy	Solution
893	Groups of Special-Equivalent Strings	Easy	Solution
894	All Possible Full Binary Trees	Medium	Solution
895	Maximum Frequency Stack	Hard	Solution
896	Monotonic Array	Easy	Solution
897	Increasing Order Search Tree	Easy	Solution
899	Orderly Queue	Hard	Solution
900	RLE Iterator	Medium	Solution
901	Online Stock Span	Medium	Solution
902	Numbers At Most N Given Digit Set	Hard	Solution
903	Valid Permutations for DI Sequence	Hard	Solution
905	Sort Array By Parity	Easy	Solution
906	Super Palindromes	Hard	Solution
908	Smallest Range I	Easy	Solution
911	Online Election	Medium	Solution
912	Sort an Array	Medium	Solution
913	Cat and Mouse	Hard	Solution
914	X of a Kind in a Deck of Cards	Easy	Solution
916	Word Subsets	Medium	Solution
917	Reverse Only Letters	Easy	Solution
918	Maximum Sum Circular Subarray	Medium	Solution
919	Complete Binary Tree Inserter	Medium	Solution
920	Number of Music Playlists	Hard	Solution
921	Minimum Add to Make Parentheses Valid	Medium	Solution
922	Sort Array By Parity II	Easy	Solution
923	3Sum With Multiplicity	Medium	Solution
924	Minimize Malware Spread	Hard	Solution
925	Long Pressed Name	Easy	Solution
926	Flip String to Monotone Increasing	Medium	Solution
928	Minimize Malware Spread II	Hard	Solution
929	Unique Email Addresses	Easy	Solution
930	Binary Subarrays With Sum	Medium	Solution
931	Minimum Falling Path Sum	Medium	Solution
932	Beautiful Array	Medium	Solution
933	Number of Recent Calls	Easy	Solution
935	Knight Dialer	Medium	Solution
936	Stamping The Sequence	Hard	Solution
937	Reorder Log Files	Easy	Solution
938	Range Sum of BST	Easy	Solution
939	Minimum Area Rectangle	Medium	Solution
940	Distinct Subsequences II	Hard	Solution
941	Valid Mountain Array	Easy	Solution
942	DI String Match	Easy	Solution
943	Find the Shortest Superstring	Hard	Solution
944	Delete Columns to Make Sorted	Easy	Solution
945	Minimum Increment to Make Array Unique	Medium	Solution
946	Validate Stack Sequences	Medium	Solution
947	Most Stones Removed with Same Row or Column	Medium	Solution
948	Bag of Tokens	Medium	Solution
949	Largest Time for Given Digits	Easy	Solution
950	Reveal Cards In Increasing Order	Medium	Solution
951	Flip Equivalent Binary Trees	Medium	Solution
952	Largest Component Size by Common Factor	Hard	Solution
953	Verifying an Alien Dictionary	Easy	Solution
954	Array of Doubled Pairs	Medium	Solution
955	Delete Columns to Make Sorted II	Medium	Solution
956	Tallest Billboard	Hard	Solution
957	Prison Cells After N Days	Medium	Solution
958	Check Completeness of a Binary Tree	Medium	Solution
959	Regions Cut By Slashes	Medium	Solution
960	Delete Columns to Make Sorted III	Hard	Solution
961	N-Repeated Element in Size 2N Array	Easy	Solution
962	Maximum Width Ramp	Medium	Solution
967	Numbers With Same Consecutive Differences	Medium	Solution
968	Binary Tree Cameras	Hard	Solution
969	Pancake Sorting	Medium	Solution
970	Powerful Integers	Easy	Solution
971	Flip Binary Tree To Match Preorder Traversal	Medium	Solution
973	K Closest Points to Origin	Easy	Solution
977	Squares of a Sorted Array	Easy	Solution
978	Longest Turbulent Subarray	Medium	Solution
979	Distribute Coins in Binary Tree	Medium	Solution
980	Unique Paths III	Hard	Solution
983	Minimum Cost For Tickets	Medium	Solution
984	String Without AAA or BBB	Medium	Solution
985	Sum of Even Numbers After Queries	Easy	Solution
986	Interval List Intersections	Medium	Solution
987	Vertical Order Traversal of a Binary Tree	Medium	Solution
989	Add to Array-Form of Integer	Easy	Solution
990	Satisfiability of Equality Equations	Medium	Solution
991	Broken Calculator	Medium	Solution
992	Subarrays with K Different Integers	Hard	Solution
993	Cousins in Binary Tree	Easy	Solution
994	Rotting Oranges	Medium	Solution
996	Number of Squareful Arrays	Hard	Solution
997	Find the Town Judge	Easy	Solution
998	Maximum Binary Tree II	Medium	Solution
999	Available Captures for Rook	Easy	Solution
1000	Minimum Cost to Merge Stones	Hard	Solution
1002	Find Common Characters	Easy	Solution
1003	Check If Word Is Valid After Substitutions	Medium	Solution
1004	Max Consecutive Ones III	Medium	Solution
1005	Maximize Sum Of Array After K Negations	Easy	Solution
1008	Construct Binary Search Tree from Preorder Traversal	Medium	Solution
1010	Pairs of Songs With Total Durations Divisible by 60	Medium	Solution
1011	Capacity To Ship Packages Within D Days	Medium	Solution
1012	Complement of Base 10 Integer	Easy	Solution
1013	Partition Array Into Three Parts With Equal Sum	Easy	Solution
1014	Best Sightseeing Pair	Medium	Solution
1016	Binary String With Substrings Representing 1 To N	Medium	Solution
1017	Convert to Base -2	Medium	Solution
1018	Binary Prefix Divisible By 5	Easy	Solution
1019	Next Greater Node In Linked List	Medium	Solution
1020	Number of Enclaves	Medium	Solution
1021	Remove Outermost Parentheses	Easy	Solution
1022	Sum of Root To Leaf Binary Numbers	Easy	Solution
1023	Camelcase Matching	Medium	Solution
1025	Divisor Game	Easy	Solution
1026	Maximum Difference Between Node and Ancestor	Medium	Solution
1027	Longest Arithmetic Sequence	Medium	Solution
1028	Recover a Tree From Preorder Traversal	Hard	Solution
1029	Two City Scheduling	Easy	Solution
1030	Matrix Cells in Distance Order	Easy	Solution
1031	Maximum Sum of Two Non-Overlapping Subarrays	Medium	Solution
1032	Stream of Characters	Hard	Solution
1033	Moving Stones Until Consecutive	Easy	Solution
1034	Coloring A Border	Medium	Solution
1035	Uncrossed Lines	Medium	Solution
1037	Valid Boomerang	Easy	Solution
1038	Binary Search Tree to Greater Sum Tree	Medium	Solution
1039	Minimum Score Triangulation of Polygon	Medium	Solution
1041	Robot Bounded In Circle	Medium	Solution
1042	Flower Planting With No Adjacent	Easy	Solution
1043	Partition Array for Maximum Sum	Medium	Solution
1044	Longest Duplicate Substring	Hard	Solution
1046	Last Stone Weight	Easy	Solution
1047	Remove All Adjacent Duplicates In String	Easy	Solution
1048	Longest String Chain	Medium	Solution
1051	Height Checker	Easy	Solution
1052	Grumpy Bookstore Owner	Medium	Solution
1053	Previous Permutation With One Swap	Medium	Solution
1054	Distant Barcodes	Medium	Solution
1071	Greatest Common Divisor of Strings	Easy	Solution
1072	Flip Columns For Maximum Number of Equal Rows	Medium	Solution
1073	Adding Two Negabinary Numbers	Medium	Solution
1074	Number of Submatrices That Sum to Target	Hard	Solution
1078	Occurrences After Bigram	Easy	Solution
1079	Letter Tile Possibilities	Medium	Solution
1080	Insufficient Nodes in Root to Leaf Paths	Medium	Solution
1081	Smallest Subsequence of Distinct Characters	Medium	Solution
1089	Duplicate Zeros	Easy	Solution
1090	Largest Values From Labels	Medium	Solution
1091	Shortest Path in Binary Matrix	Medium	Solution
1092	Shortest Common Supersequence	Hard	Solution
1094	Car Pooling	Medium	Solution
1096	Brace Expansion II	Hard	Solution
1103	Distribute Candies to People	Easy	Solution
1104	Path In Zigzag Labelled Binary Tree	Medium	Solution
1105	Filling Bookcase Shelves	Medium	Solution
1106	Parsing A Boolean Expression	Hard	Solution
1108	Defanging an IP Address	Easy	Solution
1109	Corporate Flight Bookings	Medium	Solution
1110	Delete Nodes And Return Forest	Medium	Solution
1111	Maximum Nesting Depth of Two Valid Parentheses Strings	Medium	Solution
1122	Relative Sort Array	Easy	Solution
1123	Lowest Common Ancestor of Deepest Leaves	Medium	Solution
1125	Smallest Sufficient Team	Hard	Solution
1128	Number of Equivalent Domino Pairs	Easy	Solution
1130	Minimum Cost Tree From Leaf Values	Medium	Solution
1137	N-th Tribonacci Number	Easy	Solution
1139	Largest 1-Bordered Square	Medium	Solution
1140	Stone Game II	Medium	Solution
1143	Longest Common Subsequence	Medium	Solution
1146	Snapshot Array	Medium	Solution
1154	Day of the Year	Easy	Solution
1155	Number of Dice Rolls With Target Sum	Medium	Solution
1160	Find Words That Can Be Formed by Characters	Easy	Solution
1161	Maximum Level Sum of a Binary Tree	Medium	Solution
1162	As Far from Land as Possible	Medium	Solution
1163	Last Substring in Lexicographical Order	Hard	Solution
1169	Invalid Transactions	Medium	Solution
1170	Compare Strings by Frequency of the Smallest Character	Easy	Solution
1175	Prime Arrangements	Easy	Solution
1184	Distance Between Bus Stops	Easy	Solution
1185	Day of the Week	Easy	Solution
1186	Maximum Subarray Sum with One Deletion	Medium	Solution
1187	Make Array Strictly Increasing	Hard	Solution
1189	Maximum Number of Balloons	Easy	Solution
1190	Reverse Substrings Between Each Pair of Parentheses	Medium	Solution
1200	Minimum Absolute Difference	Easy	Solution
1202	Smallest String With Swaps	Medium	Solution
1203	Sort Items by Groups Respecting Dependencies	Hard	Solution
1207	Unique Number of Occurrences	Easy	Solution
1209	Remove All Adjacent Duplicates in String II	Medium	Solution
1210	Minimum Moves to Reach Target with Rotations	Hard	Solution
1217	Minimum Cost to Move Chips to The Same Position	Easy	Solution
1219	Path with Maximum Gold	Medium	Solution
1220	Count Vowels Permutation	Hard	Solution
1221	Split a String in Balanced Strings	Easy	Solution
1222	Queens That Can Attack the King	Medium	Solution
1223	Dice Roll Simulation	Medium	Solution
1226	The Dining Philosophers	Medium	Solution
1232	Check If It Is a Straight Line	Easy	Solution
1233	Remove Sub-Folders from the Filesystem	Medium	Solution
1234	Replace the Substring for Balanced String	Medium	Solution
1235	Maximum Profit in Job Scheduling	Hard	Solution
1237	Find Positive Integer Solution for a Given Equation	Easy	Solution
1238	Circular Permutation in Binary Representation	Medium	Solution
1247	Minimum Swaps to Make Strings Equal	Medium	Solution
1248	Count Number of Nice Subarrays	Medium	Solution
1249	Minimum Remove to Make Valid Parentheses	Medium	Solution
1252	Cells with Odd Values in a Matrix	Easy	Solution
1253	Reconstruct a 2-Row Binary Matrix	Medium	Solution
1254	Number of Closed Islands	Medium	Solution
1260	Shift 2D Grid	Easy	Solution
1261	Find Elements in a Contaminated Binary Tree	Medium	Solution
1262	Greatest Sum Divisible by Three	Medium	Solution
1263	Minimum Moves to Move a Box to Their Target Location	Hard	Solution
1266	Minimum Time Visiting All Points	Easy	Solution
1267	Count Servers that Communicate	Medium	Solution
1268	Search Suggestions System	Medium	Solution
1269	Number of Ways to Stay in the Same Place After Some Steps	Hard	Solution
1275	Find Winner on a Tic Tac Toe Game	Easy	Solution
1277	Count Square Submatrices with All Ones	Medium	Solution
1278	Palindrome Partitioning III	Hard	Solution
1281	Subtract the Product and Sum of Digits of an Integer	Easy	Solution
1282	Group the People Given the Group Size They Belong To	Medium	Solution
1283	Find the Smallest Divisor Given a Threshold	Medium	Solution
1284	Minimum Number of Flips to Convert Binary Matrix to Zero Matrix	Hard	Solution
1286	Iterator for Combination	Medium	Solution
1287	Element Appearing More Than 25% In Sorted Array	Easy	Solution
1288	Remove Covered Intervals	Medium	Solution
1289	Minimum Falling Path Sum II	Hard	Solution
1290	Convert Binary Number in a Linked List to Integer	Easy	Solution
1291	Sequential Digits	Medium	Solution
1292	Maximum Side Length of a Square with Sum Less than or Equal to Threshold	Medium	Solution
1293	Shortest Path in a Grid with Obstacles Elimination	Hard	Solution
1295	Find Numbers with Even Number of Digits	Easy	Solution
1296	Divide Array in Sets of K Consecutive Numbers	Medium	Solution
1298	Maximum Candies You Can Get from Boxes	Hard	Solution
1299	Replace Elements with Greatest Element on Right Side	Easy	Solution
1300	Sum of Mutated Array Closest to Target	Medium	Solution
1301	Number of Paths with Max Score	Hard	Solution
1302	Deepest Leaves Sum	Medium	Solution
1304	Find N Unique Integers Sum up to Zero	Easy	Solution
1305	All Elements in Two Binary Search Trees	Medium	Solution
1306	Jump Game III	Medium	Solution
1307	Verbal Arithmetic Puzzle	Hard	Solution
1309	Decrypt String from Alphabet to Integer Mapping	Easy	Solution
1310	XOR Queries of a Subarray	Medium	Solution
1311	Get Watched Videos by Your Friends	Medium	Solution
1312	Minimum Insertion Steps to Make a String Palindrome	Hard	Solution
1313	Decompress Run-Length Encoded List	Easy	Solution
1314	Matrix Block Sum	Medium	Solution
1315	Sum of Nodes with Even-Valued Grandparent	Medium	Solution
1316	Distinct Echo Substrings	Hard	Solution
1317	Convert Integer to the Sum of Two No-Zero Integers	Easy	Solution
1318	Minimum Flips to Make a OR b Equal to c	Medium	Solution
1319	Number of Operations to Make Network Connected	Medium	Solution
1320	Minimum Distance to Type a Word Using Two Fingers	Hard	Solution
1323	Maximum 69 Number	Easy	Solution
1324	Print Words Vertically	Medium	Solution
1325	Delete Leaves With a Given Value	Medium	Solution
1326	Minimum Number of Taps to Open to Water a Garden	Hard	Solution
1328	Break a Palindrome	Medium	Solution
1329	Sort the Matrix Diagonally	Medium	Solution
1330	Reverse Subarray To Maximize Array Value	Hard	Solution
1331	Rank Transform of an Array	Easy	Solution
1332	Remove Palindromic Subsequences	Easy	Solution
1333	Filter Restaurants by Vegan-Friendly, Price and Distance	Medium	Solution
1334	Find the City With the Smallest Number of Neighbors at a Threshold Distance	Medium	Solution
1335	Minimum Difficulty of a Job Schedule	Hard	Solution
1338	Reduce Array Size to The Half	Medium	Solution
1339	Maximum Product of Splitted Binary Tree	Medium	Solution
1340	Jump Game V	Hard	Solution
1341	The K Weakest Rows in a Matrix	Easy	Solution
1342	Number of Steps to Reduce a Number to Zero	Easy	Solution
1343	Number of Sub-arrays of Size K and Average Greater than or Equal to Threshold	Medium	Solution
1344	Angle Between Hands of a Clock	Medium	Solution
1345	Jump Game IV	Hard	Solution
1346	Check If N and Its Double Exist	Easy	Solution
1347	Minimum Number of Steps to Make Two Strings Anagram	Medium	Solution
1348	Tweet Counts Per Frequency	Medium	Solution
1349	Maximum Students Taking Exam	Hard	Solution
1351	Count Negative Numbers in a Sorted Matrix	Easy	Solution
1352	Product of the Last K Numbers	Medium	Solution
1353	Maximum Number of Events That Can Be Attended	Medium	Solution
1354	Construct Target Array With Multiple Sums	Hard	Solution
1356	Sort Integers by The Number of 1 Bits	Easy	Solution
1357	Apply Discount Every n Orders	Medium	Solution
1358	Number of Substrings Containing All Three Characters	Medium	Solution
1359	Count All Valid Pickup and Delivery Options	Hard	Solution
1360	Number of Days Between Two Dates	Easy	Solution
1361	Validate Binary Tree Nodes	Medium	Solution
1363	Largest Multiple of Three	Hard	Solution
1367	Linked List in Binary Tree	Medium	Solution
1368	Minimum Cost to Make at Least One Valid Path in a Grid	Hard	Solution
1370	Increasing Decreasing String	Easy	Solution
1371	Find the Longest Substring Containing Vowels in Even Counts	Medium	Solution
1372	Longest ZigZag Path in a Binary Tree	Medium	Solution
1373	Maximum Sum BST in Binary Tree	Hard	Solution
1374	Generate a String With Characters That Have Odd Counts	Easy	Solution
1375	Bulb Switcher III	Medium	Solution
1376	Time Needed to Inform All Employees	Medium	Solution
1377	Frog Position After T Seconds	Hard	Solution
1379	Find a Corresponding Node of a Binary Tree in a Clone of That Tree	Medium	Solution
1380	Lucky Numbers in a Matrix	Easy	Solution
1381	Design a Stack With Increment Operation	Medium	Solution
1382	Balance a Binary Search Tree	Medium	Solution
1383	Maximum Performance of a Team	Hard	Solution
1385	Find the Distance Value Between Two Arrays	Easy	Solution
1386	Cinema Seat Allocation	Medium	Solution
1387	Sort Integers by The Power Value	Medium	Solution
1388	Pizza With 3n Slices	Hard	Solution
1389	Create Target Array in the Given Order	Easy	Solution
1390	Four Divisors	Medium	Solution
1391	Check if There is a Valid Path in a Grid	Medium	Solution
1392	Longest Happy Prefix	Hard	Solution
1397	Find All Good Strings	Hard	Solution
1399	Count Largest Group	Easy	Solution
1400	Construct K Palindrome Strings	Medium	Solution
1401	Circle and Rectangle Overlapping	Medium	Solution
1402	Reducing Dishes	Hard	Solution
1403	Minimum Subsequence in Non-Increasing Order	Easy	Solution
1404	Number of Steps to Reduce a Number in Binary Representation to One	Medium	Solution
1405	Longest Happy String	Medium	Solution
1406	Stone Game III	Hard	Solution
1408	String Matching in an Array	Easy	Solution
1409	Queries on a Permutation With Key	Medium	Solution
1410	HTML Entity Parser	Medium	Solution
1411	Number of Ways to Paint N × 3 Grid	Hard	Solution
1413	Minimum Value to Get Positive Step by Step Sum	Easy	Solution
1414	Find the Minimum Number of Fibonacci Numbers Whose Sum Is K	Medium	Solution
1415	The k-th Lexicographical String of All Happy Strings of Length n	Medium	Solution
1416	Restore The Array	Hard	Solution
1419	Minimum Number of Frogs Croaking	Medium	Solution
1420	Build Array Where You Can Find The Maximum Exactly K Comparisons	Hard	Solution
1422	Maximum Score After Splitting a String	Easy	Solution
1423	Maximum Points You Can Obtain from Cards	Medium	Solution
1424	Diagonal Traverse II	Medium	Solution
1425	Constrained Subsequence Sum	Hard	Solution
1428	Leftmost Column with at Least a One	Medium	Solution
1429	First Unique Number	Medium	Solution
1430	Check If a String Is a Valid Sequence from Root to Leaves Path in a Binary Tree	Medium	Solution
1434	Number of Ways to Wear Different Hats to Each Other	Hard	Solution
1436	Destination City	Easy	Solution
1437	Check If All 1's Are at Least Length K Places Away	Medium	Solution
1438	Longest Continuous Subarray With Absolute Diff Less Than or Equal to Limit	Medium	Solution
1439	Find the Kth Smallest Sum of a Matrix With Sorted Rows	Hard	Solution
1441	Build an Array With Stack Operations		Solution
1442	Count Triplets That Can Form Two Arrays of Equal XOR	Medium	Solution
1443	Minimum Time to Collect All Apples in a Tree	Medium	Solution
1444	Number of Ways of Cutting a Pizza	Hard	Solution
1446	Consecutive Characters	Easy	Solution
1447	Simplified Fractions	Medium	Solution
1448	Count Good Nodes in Binary Tree	Medium	Solution
1449	Form Largest Integer With Digits That Add up to Target	Hard	Solution
1452	People Whose List of Favorite Companies Is Not a Subset of Another List	Medium	Solution
1455	Check If a Word Occurs As a Prefix of Any Word in a Sentence	Easy	Solution
1456	Maximum Number of Vowels in a Substring of Given Length	Medium	Solution
1457	Pseudo-Palindromic Paths in a Binary Tree	Medium	Solution
1458	Max Dot Product of Two Subsequences	Hard	Solution
1460	Make Two Arrays Equal by Reversing Sub-arrays	Easy	Solution
1461	Check If a String Contains All Binary Codes of Size K	Medium	Solution
1462	Course Schedule IV	Medium	Solution
1463	Cherry Pickup II	Hard	Solution
1464	Maximum Product of Two Elements in an Array	Easy	Solution
1467	Probability of a Two Boxes Having The Same Number of Distinct Balls	Hard	Solution
1470	Shuffle the Array	Easy	Solution
1471	The k Strongest Values in an Array	Medium	Solution
1472	Design Browser History	Medium	Solution
1473	Paint House III	Hard	Solution
1475	Final Prices With a Special Discount in a Shop	Easy	Solution
1476	Subrectangle Queries	Medium	Solution
1477	Find Two Non-overlapping Sub-arrays Each With Target Sum		Solution
1478	Allocate Mailboxes	Hard	Solution
1480	Running Sum of 1d Array	Easy	Solution
1481	Least Number of Unique Integers after K Removals	Medium	Solution
1482	Minimum Number of Days to Make m Bouquets	Medium	Solution
1483	Kth Ancestor of a Tree Node	Hard	Solution
1486	XOR Operation in an Array	Easy	Solution
1487	Making File Names Unique	Medium	Solution
1488	Avoid Flood in The City	Medium	Solution
1489	Find Critical and Pseudo-Critical Edges in Minimum Spanning Tree	Hard	Solution
1491	Average Salary Excluding the Minimum and Maximum Salary	Easy	Solution
1492	The kth Factor of n	Medium	Solution
1493	Longest Subarray of 1's After Deleting One Element	Medium	Solution
1494	Parallel Courses II	Hard	Solution
1496	Path Crossing	Easy	Solution
1497	Check If Array Pairs Are Divisible by k	Medium	Solution
1498	Number of Subsequences That Satisfy the Given Sum Condition	Medium	Solution
1499	Max Value of Equation	Hard	Solution
1502	Can Make Arithmetic Progression From Sequence	Easy	Solution
1503	Last Moment Before All Ants Fall Out of a Plank	Medium	Solution
1504	Count Submatrices With All Ones	Medium	Solution
1505	Minimum Possible Integer After at Most K Adjacent Swaps On Digits	Hard	Solution
1507	Reformat Date	Easy	Solution
1508	Range Sum of Sorted Subarray Sums	Medium	Solution
1509	Minimum Difference Between Largest and Smallest Value in Three Moves	Medium	Solution
1510	Stone Game IV	Hard	Solution
1512	Number of Good Pairs	Easy	Solution
1513	Number of Substrings With Only 1s	Medium	Solution
1514	Path with Maximum Probability	Medium	Solution
1515	Best Position for a Service Centre	Hard	Solution
1518	Water Bottles	Easy	Solution
1519	Number of Nodes in the Sub-Tree With the Same Label	Medium	Solution
1520	Maximum Number of Non-Overlapping Substrings	Medium	Solution
1521	Find a Value of a Mysterious Function Closest to Target	Hard	Solution
1523	Count Odd Numbers in an Interval Range	Easy	Solution
1524	Number of Sub-arrays With Odd Sum	Medium	Solution
1525	Number of Good Ways to Split a String	Medium	Solution
1526	Minimum Number of Increments on Subarrays to Form a Target Array	Hard	Solution
1531	String Compression II	Hard	Solution
1534	Count Good Triplets	Easy	Solution
1535	Find the Winner of an Array Game	Medium	Solution
1536	Minimum Swaps to Arrange a Binary Grid	Medium	Solution
1537	Get the Maximum Score	Hard	Solution
1539	Kth Missing Positive Number	Easy	Solution
1540	Can Convert String in K Moves	Medium	Solution
1541	Minimum Insertions to Balance a Parentheses String	Medium	Solution
1542	Find Longest Awesome Substring	Hard	Solution
1544	Make The String Great	Easy	Solution
1545	Find Kth Bit in Nth Binary String	Medium	Solution
1546	Maximum Number of Non-Overlapping Subarrays With Sum Equals Target	Medium	Solution
1547	Minimum Cost to Cut a Stick	Hard	Solution
1550	Three Consecutive Odds	Easy	Solution
1551	Minimum Operations to Make Array Equal	Medium	Solution
1552	Magnetic Force Between Two Balls	Medium	Solution
1553	Minimum Number of Days to Eat N Oranges	Hard	Solution
1556	Thousand Separator	Easy	Solution
1557	Minimum Number of Vertices to Reach All Nodes	Medium	Solution
1558	Minimum Numbers of Function Calls to Make Target Array	Medium	Solution
1559	Detect Cycles in 2D Grid		Solution
1560	Most Visited Sector in a Circular Track	Easy	Solution
1561	Maximum Number of Coins You Can Get	Medium	Solution
1562	Find Latest Group of Size M	Medium	Solution
1563	Stone Game V	Hard	Solution
1566	Detect Pattern of Length M Repeated K or More Times	Easy	Solution
1567	Maximum Length of Subarray With Positive Product	Medium	Solution
1568	Minimum Number of Days to Disconnect Island	Medium	Solution
1569	Number of Ways to Reorder Array to Get Same BST	Hard	Solution
1572	Matrix Diagonal Sum	Easy	Solution
1573	Number of Ways to Split a String	Medium	Solution
1574	Shortest Subarray to be Removed to Make Array Sorted	Medium	Solution
1575	Count All Possible Routes	Hard	Solution
1576	Replace All ?'s to Avoid Consecutive Repeating Characters	Easy	Solution
1577	Number of Ways Where Square of Number Is Equal to Product of Two Numbers	Medium	Solution
1578	Minimum Deletion Cost to Avoid Repeating Letters	Medium	Solution
1579	Remove Max Number of Edges to Keep Graph Fully Traversable	Hard	Solution
1582	Special Positions in a Binary Matrix	Easy	Solution
1583	Count Unhappy Friends	Medium	Solution
1584	Min Cost to Connect All Points	Medium	Solution
1585	Check If String Is Transformable With Substring Sort Operations	Hard	Solution
1588	Sum of All Odd Length Subarrays	Easy	Solution
1589	Maximum Sum Obtained of Any Permutation	Medium	Solution
1590	Make Sum Divisible by P	Medium	Solution
1591	Strange Printer II	Hard	Solution
1592	Rearrange Spaces Between Words	Easy	Solution
1593	Split a String Into the Max Number of Unique Substrings	Medium	Solution
1594	Maximum Non Negative Product in a Matrix	Medium	Solution
1595	Minimum Cost to Connect Two Groups of Points	Hard	Solution
1598	Crawler Log Folder	Easy	Solution
1599	Maximum Profit of Operating a Centennial Wheel	Medium	Solution
1600	Throne Inheritance	Medium	Solution
1601	Maximum Number of Achievable Transfer Requests	Hard	Solution
1603	Design Parking System	Easy	Solution
1604	Alert Using Same Key-Card Three or More Times in a One Hour Period	Medium	Solution
1605	Find Valid Matrix Given Row and Column Sums	Medium	Solution
1606	Find Servers That Handled Most Number of Requests	Hard	Solution
1608	Special Array With X Elements Greater Than or Equal X	Easy	Solution
1609	Even Odd Tree	Medium	Solution
1610	Maximum Number of Visible Points	Medium	Solution
1611	Minimum One Bit Operations to Make Integers Zero	Hard	Solution
1614	Maximum Nesting Depth of the Parentheses	Easy	Solution
1615	Maximal Network Rank	Medium	Solution
1616	Split Two Strings to Make Palindrome	Medium	Solution
1617	Count Subtrees With Max Distance Between Cities	Hard	Solution
1619	Mean of Array After Removing Some Elements	Easy	Solution
1620	Coordinate With Maximum Network Quality	Medium	Solution
1621	Number of Sets of K Non-Overlapping Line Segments	Medium	Solution
1622	Fancy Sequence	Hard	Solution
1624	Largest Substring Between Two Equal Characters	Easy	Solution
1625	Lexicographically Smallest String After Applying Operations	Medium	Solution
1626	Best Team With No Conflicts	Medium	Solution
1627	Graph Connectivity With Threshold	Hard	Solution
1631	Path With Minimum Effort	Medium	Solution
1632	Rank Transform of a Matrix	Hard	Solution
1636	Sort Array by Increasing Frequency	Easy	Solution
1637	Widest Vertical Area Between Two Points Containing No Points	Medium	Solution
1638	Count Substrings That Differ by One Character	Medium	Solution
1639	Number of Ways to Form a Target String Given a Dictionary	Hard	Solution
1640	Check Array Formation Through Concatenation	Easy	Solution
1641	Count Sorted Vowel Strings	Medium	Solution
1642	Furthest Building You Can Reach	Medium	Solution
1643	Kth Smallest Instructions	Hard	Solution
1648	Sell Diminishing-Valued Colored Balls	Medium	Solution
1649	Create Sorted Array through Instructions	Hard	Solution
1654	Minimum Jumps to Reach Home	Medium	Solution
1657	Determine if Two Strings Are Close	Medium	Solution
1658	Minimum Operations to Reduce X to Zero	Medium	Solution
1659	Maximize Grid Happiness	Hard	Solution
1662	Check If Two String Arrays are Equivalent	Easy	Solution
1663	Smallest String With A Given Numeric Value	Medium	Solution
1664	Ways to Make a Fair Array	Medium	Solution
1665	Minimum Initial Energy to Finish Tasks	Hard	Solution
1668	Maximum Repeating Substring	Easy	Solution
1669	Merge In Between Linked Lists	Medium	Solution
1670	Design Front Middle Back Queue	Medium	Solution
1671	Minimum Number of Removals to Make Mountain Array	Hard	Solution
1672	Richest Customer Wealth	Easy	Solution
1673	Find the Most Competitive Subsequence	Medium	Solution
1674	Minimum Moves to Make Array Complementary	Medium	Solution
1675	Minimize Deviation in Array	Hard	Solution
1678	Goal Parser Interpretation	Easy	Solution
1679	Max Number of K-Sum Pairs	Medium	Solution
1680	Concatenation of Consecutive Binary Numbers	Medium	Solution
1681	Minimum Incompatibility	Hard	Solution
1687	Delivering Boxes from Storage to Ports	Hard	Solution
1688	Count of Matches in Tournament	Easy	Solution
1689	Partitioning Into Minimum Number Of Deci-Binary Numbers	Medium	Solution
1690	Stone Game VII	Medium	Solution
1691	Maximum Height by Stacking Cuboids	Hard	Solution
1694	Reformat Phone Number	Easy	Solution
1695	Maximum Erasure Value	Medium	Solution
1696	Jump Game VI	Medium	Solution
1697	Checking Existence of Edge Length Limited Paths	Hard	Solution
1700	Number of Students Unable to Eat Lunch	Easy	Solution
1701	Average Waiting Time	Medium	Solution
1702	Maximum Binary String After Change	Medium	Solution
1704	Determine if String Halves Are Alike	Easy	Solution
1705	Maximum Number of Eaten Apples	Medium	Solution
1706	Where Will the Ball Fall	Medium	Solution
1707	Maximum XOR With an Element From Array	Hard	Solution
1710	Maximum Units on a Truck	Easy	Solution
1711	Count Good Meals	Medium	Solution
1712	Ways to Split Array Into Three Subarrays	Medium	Solution
1713	Minimum Operations to Make a Subsequence	Hard	Solution
1716	Calculate Money in Leetcode Bank	Easy	Solution
1717	Maximum Score From Removing Substrings	Medium	Solution
1718	Construct the Lexicographically Largest Valid Sequence	Medium	Solution
1719	Number Of Ways To Reconstruct A Tree	Hard	Solution
1720	Decode XORed Array	Easy	Solution
1721	Swapping Nodes in a Linked List	Medium	Solution
1722	Minimize Hamming Distance After Swap Operations	Medium	Solution
1723	Find Minimum Time to Finish All Jobs	Hard	Solution
1727	Largest Submatrix With Rearrangements	Medium	Solution
1732	Find the Highest Altitude	Easy	Solution
1733	Minimum Number of People to Teach	Medium	Solution
1734	Decode XORed Permutation	Medium	Solution
1735	Count Ways to Make Array With Product	Hard	Solution
1736	Latest Time by Replacing Hidden Digits	Easy	Solution
1737	Change Minimum Characters to Satisfy One of Three Conditions	Medium	Solution
1738	Find Kth Largest XOR Coordinate Value	Medium	Solution
1739	Building Boxes	Hard	Solution
1744	Can You Eat Your Favorite Candy on Your Favorite Day?	Medium	Solution
1745	Palindrome Partitioning IV	Hard	Solution
1749	Maximum Absolute Sum of Any Subarray	Medium	Solution
1754	Largest Merge Of Two Strings	Medium	Solution
1763	Longest Nice Substring	Easy	Solution
1764	Form Array by Concatenating Subarrays of Another Array	Medium	Solution
1765	Map of Highest Peak	Medium	Solution
1766	Tree of Coprimes	Hard	Solution
1768	Merge Strings Alternately	Easy	Solution
1769	Minimum Number of Operations to Move All Balls to Each Box	Medium	Solution
1770	Maximum Score from Performing Multiplication Operations	Medium	Solution
1771	Maximize Palindrome Length From Subsequences	Hard	Solution
1773	Count Items Matching a Rule	Easy	Solution
1774	Closest Dessert Cost	Medium	Solution
1775	Equal Sum Arrays With Minimum Number of Operations	Medium	Solution
1784	Check if Binary String Has at Most One Segment of Ones	Easy	Solution
1785	Minimum Elements to Add to Form a Given Sum	Medium	Solution
1786	Number of Restricted Paths From First to Last Node	Medium	Solution
1787	Make the XOR of All Segments Equal to Zero	Hard	Solution
1790	Check if One String Swap Can Make Strings Equal	Easy	Solution
1791	Find Center of Star Graph	Medium	Solution
1792	Maximum Average Pass Ratio	Medium	Solution
1793	Maximum Score of a Good Subarray	Hard	Solution
1796	Second Largest Digit in a String	Easy	Solution
1797	Design Authentication Manager	Medium	Solution
1798	Maximum Number of Consecutive Values You Can Make	Medium	Solution
1799	Maximize Score After N Operations	Hard	Solution
1800	Maximum Ascending Subarray Sum	Easy	Solution
1801	Number of Orders in the Backlog	Medium	Solution
1802	Maximum Value at a Given Index in a Bounded Array	Medium	Solution
1803	Count Pairs With XOR in a Range	Hard	Solution

License

All rights reserved by github.com/lzl124631x. Contact me if you want to redistribute the code. No commercial use.

TheCodingBlogs/LeetCode

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