LeetCode

This is my answer of Leetcode, most of them written by Python method.

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Directory

id	title	Difficulty	Solution	Lock	Solved
1	Two Sum	easy	c		✅
2	Add Two Numbers	medium
3	Longest Substring Without Repeating Characters	medium
4	Median of Two Sorted Arrays	hard	cpp		✅
5	Longest Palindromic Substring	medium
6	ZigZag Conversion	medium
7	Reverse Integer	easy			✅
8	String to Integer (atoi)	medium
9	Palindrome Number	easy
10	Regular Expression Matching	hard
11	Container With Most Water	medium
12	Integer to Roman	medium
13	Roman to Integer	easy
14	Longest Common Prefix	easy
15	3Sum	medium	cpp		✅
16	3Sum Closest	medium
17	Letter Combinations of a Phone Number	medium
18	4Sum	medium
19	Remove Nth Node From End of List	medium
20	Valid Parentheses	easy			✅
21	Merge Two Sorted Lists	easy
22	Generate Parentheses	medium			✅
23	Merge k Sorted Lists	hard
24	Swap Nodes in Pairs	medium
25	Reverse Nodes in k-Group	hard
26	Remove Duplicates from Sorted Array	easy	c		✅
27	Remove Element	easy
28	Implement strStr()	easy
29	Divide Two Integers	medium	cpp		✅
30	Substring with Concatenation of All Words	hard
31	Next Permutation	medium	c		✅
32	Longest Valid Parentheses	hard
33	Search in Rotated Sorted Array	medium	cpp		✅
34	Search for a Range	medium	cpp		✅
35	Search Insert Position	easy	cpp		✅
36	Valid Sudoku	medium
37	Sudoku Solver	hard
38	Count and Say	easy
39	Combination Sum	medium	c		✅
40	Combination Sum II	medium	c		✅
41	First Missing Positive	hard			✅
42	Trapping Rain Water	hard
43	Multiply Strings	medium
44	Wildcard Matching	hard
45	Jump Game II	hard	c		✅
46	Permutations	medium
47	Permutations II	medium
48	Rotate Image	medium	c		✅
49	Group Anagrams	medium
50	Pow(x, n)	medium			✅
51	N-Queens	hard
52	N-Queens II	hard
53	Maximum Subarray	easy	cpp		✅
54	Spiral Matrix	medium			✅
55	Jump Game	medium	c		✅
56	Merge Intervals	medium	c		✅
57	Insert Interval	hard	c		✅
58	Length of Last Word	easy
59	Spiral Matrix II	medium
60	Permutation Sequence	medium
61	Rotate List	medium
62	Unique Paths	medium	cpp		✅
63	Unique Paths II	medium	cpp		✅
64	Minimum Path Sum	medium			✅
65	Valid Number	hard
66	Plus One	easy	c		✅
67	Add Binary	easy
68	Text Justification	hard
69	Sqrt(x)	easy			✅
70	Climbing Stairs	easy			✅
71	Simplify Path	medium
72	Edit Distance	hard	cpp		✅
73	Set Matrix Zeroes	medium
74	Search a 2D Matrix	medium	c		✅
75	Sort Colors	medium
76	Minimum Window Substring	hard
77	Combinations	medium
78	Subsets	medium	c		✅
79	Word Search	medium			✅
80	Remove Duplicates from Sorted Array II	medium
81	Search in Rotated Sorted Array II	medium	cpp		✅
82	Remove Duplicates from Sorted List II	medium
83	Remove Duplicates from Sorted List	easy
84	Largest Rectangle in Histogram	hard	c		✅
85	Maximal Rectangle	hard	c		✅
86	Partition List	medium
87	Scramble String	hard
88	Merge Sorted Array	easy
89	Gray Code	medium
90	Subsets II	medium
91	Decode Ways	medium			✅
92	Reverse Linked List II	medium
93	Restore IP Addresses	medium
94	Binary Tree Inorder Traversal	medium
95	Unique Binary Search Trees II	medium
96	Unique Binary Search Trees	medium
97	Interleaving String	hard	cpp		✅
98	Validate Binary Search Tree	medium
99	Recover Binary Search Tree	hard
100	Same Tree	easy
101	Symmetric Tree	easy
102	Binary Tree Level Order Traversal	medium
103	Binary Tree Zigzag Level Order Traversal	medium
104	Maximum Depth of Binary Tree	easy	cpp		✅
105	Construct Binary Tree from Preorder and Inorder Traversal	medium
106	Construct Binary Tree from Inorder and Postorder Traversal	medium
107	Binary Tree Level Order Traversal II	easy
108	Convert Sorted Array to Binary Search Tree	easy	cpp		✅
109	Convert Sorted List to Binary Search Tree	medium
110	Balanced Binary Tree	easy
111	Minimum Depth of Binary Tree	easy
112	Path Sum	easy
113	Path Sum II	medium
114	Flatten Binary Tree to Linked List	medium
115	Distinct Subsequences	hard	cpp		✅
116	Populating Next Right Pointers in Each Node	medium
117	Populating Next Right Pointers in Each Node II	medium
118	Pascal's Triangle	easy	c		✅
119	Pascal's Triangle II	easy	c		✅
120	Triangle	medium	cpp		✅
121	Best Time to Buy and Sell Stock	easy			✅
122	Best Time to Buy and Sell Stock II	easy			✅
123	Best Time to Buy and Sell Stock III	hard			✅
124	Binary Tree Maximum Path Sum	hard
125	Valid Palindrome	easy			✅
126	Word Ladder II	hard
127	Word Ladder	medium
128	Longest Consecutive Sequence	hard	cpp		✅
129	Sum Root to Leaf Numbers	medium
130	Surrounded Regions	medium
131	Palindrome Partitioning	medium	cpp		✅
132	Palindrome Partitioning II	hard	cpp		✅
133	Clone Graph	medium
134	Gas Station	medium
135	Candy	hard
136	Single Number	easy
137	Single Number II	medium
138	Copy List with Random Pointer	medium
139	Word Break	medium			✅
140	Word Break II	hard
141	Linked List Cycle	easy
142	Linked List Cycle II	medium
143	Reorder List	medium
144	Binary Tree Preorder Traversal	medium
145	Binary Tree Postorder Traversal	hard
146	LRU Cache	hard
147	Insertion Sort List	medium
148	Sort List	medium
149	Max Points on a Line	hard
150	Evaluate Reverse Polish Notation	medium
151	Reverse Words in a String	medium
152	Maximum Product Subarray	medium			✅
153	Find Minimum in Rotated Sorted Array	medium	cpp		✅
154	Find Minimum in Rotated Sorted Array II	hard	cpp		✅
155	Min Stack	easy
156	Binary Tree Upside Down	medium		🔒
157	Read N Characters Given Read4	easy		🔒
158	Read N Characters Given Read4 II - Call multiple times	hard		🔒
159	Longest Substring with At Most Two Distinct Characters	hard		🔒
160	Intersection of Two Linked Lists	easy
161	One Edit Distance	medium		🔒
162	Find Peak Element	medium	cpp		✅
163	Missing Ranges	medium		🔒
164	Maximum Gap	hard
165	Compare Version Numbers	medium
166	Fraction to Recurring Decimal	medium
167	Two Sum II - Input array is sorted	easy	cpp		✅
168	Excel Sheet Column Title	easy
169	Majority Element	easy			✅
170	Two Sum III - Data structure design	easy		🔒
171	Excel Sheet Column Number	easy
172	Factorial Trailing Zeroes	easy
173	Binary Search Tree Iterator	medium
174	Dungeon Game	hard	cpp		✅
175	Combine Two Tables	easy
176	Second Highest Salary	easy
177	Nth Highest Salary	medium
178	Rank Scores	medium
179	Largest Number	medium
180	Consecutive Numbers	medium
181	Employees Earning More Than Their Managers	easy
182	Duplicate Emails	easy
183	Customers Who Never Order	easy
184	Department Highest Salary	medium
185	Department Top Three Salaries	hard
186	Reverse Words in a String II	medium		🔒
187	Repeated DNA Sequences	medium
188	Best Time to Buy and Sell Stock IV	hard
189	Rotate Array	easy			✅
190	Reverse Bits	easy
191	Number of 1 Bits	easy
192	Word Frequency	medium
193	Valid Phone Numbers	easy
194	Transpose File	medium
195	Tenth Line	easy
196	Delete Duplicate Emails	easy
197	Rising Temperature	easy
198	House Robber	easy			✅
199	Binary Tree Right Side View	medium
200	Number of Islands	medium
201	Bitwise AND of Numbers Range	medium
202	Happy Number	easy
203	Remove Linked List Elements	easy
204	Count Primes	easy
205	Isomorphic Strings	easy
206	Reverse Linked List	easy
207	Course Schedule	medium
208	Implement Trie (Prefix Tree)	medium
209	Minimum Size Subarray Sum	medium	c		✅
210	Course Schedule II	medium
211	Add and Search Word - Data structure design	medium
212	Word Search II	hard
213	House Robber II	medium
214	Shortest Palindrome	hard
215	Kth Largest Element in an Array	medium
216	Combination Sum III	medium
217	Contains Duplicate	easy
218	The Skyline Problem	hard
219	Contains Duplicate II	easy
220	Contains Duplicate III	medium
221	Maximal Square	medium
222	Count Complete Tree Nodes	medium	cpp		✅
223	Rectangle Area	medium
224	Basic Calculator	hard
225	Implement Stack using Queues	easy
226	Invert Binary Tree	easy
227	Basic Calculator II	medium
228	Summary Ranges	medium			✅
229	Majority Element II	medium			✅
230	Kth Smallest Element in a BST	medium	cpp		✅
231	Power of Two	easy
232	Implement Queue using Stacks	easy
233	Number of Digit One	hard
234	Palindrome Linked List	easy
235	Lowest Common Ancestor of a Binary Search Tree	easy
236	Lowest Common Ancestor of a Binary Tree	medium
237	Delete Node in a Linked List	easy
238	Product of Array Except Self	medium	cpp		✅
239	Sliding Window Maximum	hard
240	Search a 2D Matrix II	medium	cpp		✅
241	Different Ways to Add Parentheses	medium
242	Valid Anagram	easy	cpp		✅
243	Shortest Word Distance	easy		🔒
244	Shortest Word Distance II	medium		🔒
245	Shortest Word Distance III	medium		🔒
246	Strobogrammatic Number	easy		🔒
247	Strobogrammatic Number II	medium		🔒
248	Strobogrammatic Number III	hard		🔒
249	Group Shifted Strings	medium		🔒
250	Count Univalue Subtrees	medium		🔒
251	Flatten 2D Vector	medium		🔒
252	Meeting Rooms	easy		🔒
253	Meeting Rooms II	medium		🔒
254	Factor Combinations	medium		🔒
255	Verify Preorder Sequence in Binary Search Tree	medium		🔒
256	Paint House	easy		🔒
257	Binary Tree Paths	easy
258	Add Digits	easy
259	3Sum Smaller	medium		🔒
260	Single Number III	medium
261	Graph Valid Tree	medium		🔒
262	Trips and Users	hard
263	Ugly Number	easy
264	Ugly Number II	medium
265	Paint House II	hard		🔒
266	Palindrome Permutation	easy		🔒
267	Palindrome Permutation II	medium		🔒
268	Missing Number	easy	c		✅
269	Alien Dictionary	hard		🔒
270	Closest Binary Search Tree Value	easy		🔒
271	Encode and Decode Strings	medium		🔒
272	Closest Binary Search Tree Value II	hard		🔒
273	Integer to English Words	hard
274	H-Index	medium	cpp		✅
275	H-Index II	medium	cpp		✅
276	Paint Fence	easy		🔒
277	Find the Celebrity	medium		🔒
278	First Bad Version	easy	cpp		✅
279	Perfect Squares	medium
280	Wiggle Sort	medium		🔒
281	Zigzag Iterator	medium		🔒
282	Expression Add Operators	hard
283	Move Zeroes	easy			✅
284	Peeking Iterator	medium
285	Inorder Successor in BST	medium		🔒
286	Walls and Gates	medium		🔒
287	Find the Duplicate Number	medium	c		✅
288	Unique Word Abbreviation	medium		🔒
289	Game of Life	medium
290	Word Pattern	easy
291	Word Pattern II	hard		🔒
292	Nim Game	easy
293	Flip Game	easy		🔒
294	Flip Game II	medium		🔒
295	Find Median from Data Stream	hard
296	Best Meeting Point	hard		🔒
297	Serialize and Deserialize Binary Tree	hard
298	Binary Tree Longest Consecutive Sequence	medium		🔒
299	Bulls and Cows	medium
300	Longest Increasing Subsequence	medium	cpp		✅
301	Remove Invalid Parentheses	hard
302	Smallest Rectangle Enclosing Black Pixels	hard		🔒
303	Range Sum Query - Immutable	easy			✅
304	Range Sum Query 2D - Immutable	medium
305	Number of Islands II	hard		🔒
306	Additive Number	medium
307	Range Sum Query - Mutable	medium
308	Range Sum Query 2D - Mutable	hard		🔒
309	Best Time to Buy and Sell Stock with Cooldown	medium
310	Minimum Height Trees	medium
311	Sparse Matrix Multiplication	medium		🔒
312	Burst Balloons	hard	cpp		✅
313	Super Ugly Number	medium
314	Binary Tree Vertical Order Traversal	medium		🔒
315	Count of Smaller Numbers After Self	hard
316	Remove Duplicate Letters	hard	cpp		✅
317	Shortest Distance from All Buildings	hard		🔒
318	Maximum Product of Word Lengths	medium
319	Bulb Switcher	medium
320	Generalized Abbreviation	medium		🔒
321	Create Maximum Number	hard
322	Coin Change	medium
323	Number of Connected Components in an Undirected Graph	medium		🔒
324	Wiggle Sort II	medium
325	Maximum Size Subarray Sum Equals k	medium		🔒
326	Power of Three	easy
327	Count of Range Sum	hard
328	Odd Even Linked List	medium			✅
329	Longest Increasing Path in a Matrix	hard
330	Patching Array	hard
331	Verify Preorder Serialization of a Binary Tree	medium
332	Reconstruct Itinerary	medium
333	Largest BST Subtree	medium		🔒
334	Increasing Triplet Subsequence	medium
335	Self Crossing	hard	cpp		✅
336	Palindrome Pairs	hard
337	House Robber III	medium
338	Counting Bits	medium			✅
339	Nested List Weight Sum	easy		🔒
340	Longest Substring with At Most K Distinct Characters	hard		🔒
341	Flatten Nested List Iterator	medium			❌
342	Power of Four	easy
343	Integer Break	medium	cpp		✅
344	Reverse String	easy			✅
345	Reverse Vowels of a String	easy
346	Moving Average from Data Stream	easy		🔒
347	Top K Frequent Elements	medium
348	Design Tic-Tac-Toe	medium		🔒
349	Intersection of Two Arrays	easy	cpp		✅
350	Intersection of Two Arrays II	easy	cpp		✅
351	Android Unlock Patterns	medium		🔒
352	Data Stream as Disjoint Intervals	hard
353	Design Snake Game	medium		🔒
354	Russian Doll Envelopes	hard	cpp		✅
355	Design Twitter	medium
356	Line Reflection	medium		🔒
357	Count Numbers with Unique Digits	medium	cpp		✅
358	Rearrange String k Distance Apart	hard		🔒
359	Logger Rate Limiter	easy		🔒
360	Sort Transformed Array	medium		🔒
361	Bomb Enemy	medium		🔒
362	Design Hit Counter	medium		🔒
363	Max Sum of Rectangle No Larger Than K	hard	cpp		✅
364	Nested List Weight Sum II	medium		🔒
365	Water and Jug Problem	medium
366	Find Leaves of Binary Tree	medium		🔒
367	Valid Perfect Square	easy	cpp		✅
368	Largest Divisible Subset	medium
369	Plus One Linked List	medium		🔒
370	Range Addition	medium		🔒
371	Sum of Two Integers	easy
372	Super Pow	medium
373	Find K Pairs with Smallest Sums	medium
374	Guess Number Higher or Lower	easy	cpp		✅
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	cpp		✅
379	Design Phone Directory	medium		🔒
380	Insert Delete GetRandom O(1)	medium	cpp		✅
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	cpp		✅
388	Longest Absolute File Path	medium
389	Find the Difference	easy
390	Elimination Game	medium
391	Perfect Rectangle	hard
392	Is Subsequence	medium	cpp		✅
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	easy
401	Binary Watch	easy
402	Remove K Digits	medium
403	Frog Jump	hard
404	Sum of Left Leaves	easy
405	Convert a Number to Hexadecimal	easy
406	Queue Reconstruction by Height	medium
407	Trapping Rain Water II	hard
408	Valid Word Abbreviation	easy		🔒
409	Longest Palindrome	easy
410	Split Array Largest Sum	hard	cpp		✅
411	Minimum Unique Word Abbreviation	hard		🔒
412	Fizz Buzz	easy
413	Arithmetic Slices	medium			✅
414	Third Maximum Number	easy			✅
415	Add Strings	easy
416	Partition Equal Subset Sum	medium
417	Pacific Atlantic Water Flow	medium
418	Sentence Screen Fitting	medium		🔒
419	Battleships in a Board	medium
420	Strong Password Checker	hard
421	Maximum XOR of Two Numbers in an Array	medium
422	Valid Word Square	easy		🔒
423	Reconstruct Original Digits from English	medium
424	Longest Repeating Character Replacement	medium
425	Word Squares	hard		🔒
432	All O`one Data Structure	hard
433	Minimum Genetic Mutation	medium
434	Number of Segments in a String	easy
435	Non-overlapping Intervals	medium
436	Find Right Interval	medium	cpp		✅
437	Path Sum III	easy
438	Find All Anagrams in a String	easy
439	Ternary Expression Parser	medium		🔒
440	K-th Smallest in Lexicographical Order	hard
441	Arranging Coins	easy			✅
442	Find All Duplicates in an Array	medium	c		✅
443	String Compression	easy
444	Sequence Reconstruction	medium		🔒
445	Add Two Numbers II	medium
446	Arithmetic Slices II - Subsequence	hard
447	Number of Boomerangs	easy
448	Find All Numbers Disappeared in an Array	easy	c		✅
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	cpp		✅
455	Assign Cookies	easy
456	132 Pattern	medium
457	Circular Array Loop	medium
458	Poor Pigs	easy			✅
459	Repeated Substring Pattern	easy
460	LFU Cache	hard
461	Hamming Distance	easy			✅
462	Minimum Moves to Equal Array Elements II	medium
463	Island Perimeter	easy
464	Can I Win	medium
465	Optimal Account Balancing	hard		🔒
466	Count The Repetitions	hard
467	Unique Substrings in Wraparound String	medium
468	Validate IP Address	medium
469	Convex Polygon	medium		🔒
471	Encode String with Shortest Length	hard		🔒
472	Concatenated Words	hard
473	Matchsticks to Square	medium
474	Ones and Zeroes	medium
475	Heaters	easy	cpp		✅
476	Number Complement	easy			✅
477	Total Hamming Distance	medium
479	Largest Palindrome Product	easy
480	Sliding Window Median	hard
481	Magical String	medium
482	License Key Formatting	easy
483	Smallest Good Base	hard	cpp		✅
484	Find Permutation	medium		🔒
485	Max Consecutive Ones	easy	c		✅
486	Predict the Winner	medium
487	Max Consecutive Ones II	medium		🔒
488	Zuma Game	hard
490	The Maze	medium		🔒
491	Increasing Subsequences	medium
492	Construct the Rectangle	easy
493	Reverse Pairs	hard
494	Target Sum	medium
495	Teemo Attacking	medium	c		✅
496	Next Greater Element I	easy
498	Diagonal Traverse	medium
499	The Maze III	hard		🔒
500	Keyboard Row	easy
501	Find Mode in Binary Search Tree	easy
502	IPO	hard
503	Next Greater Element II	medium
504	Base 7	easy
505	The Maze II	medium		🔒
506	Relative Ranks	easy
507	Perfect Number	easy
508	Most Frequent Subtree Sum	medium
513	Find Bottom Left Tree Value	medium
514	Freedom Trail	hard	cpp		✅
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
525	Contiguous Array	medium
526	Beautiful Arrangement	medium
527	Word Abbreviation	hard		🔒
529	Minesweeper	medium
530	Minimum Absolute Difference in BST	easy
531	Lonely Pixel I	medium		🔒
532	K-diff Pairs in an Array	easy	cpp		✅
533	Lonely Pixel II	medium		🔒
535	Encode and Decode TinyURL	medium
536	Construct Binary Tree from String	medium		🔒
537	Complex Number Multiplication	medium
538	Convert BST to Greater Tree	easy
539	Minimum Time Difference	medium
540	Single Element in a Sorted Array	medium
541	Reverse String II	easy
542	01 Matrix	medium
543	Diameter of Binary Tree	easy
544	Output Contest Matches	medium		🔒
545	Boundary of Binary Tree	medium		🔒
546	Remove Boxes	hard
547	Friend Circles	medium
548	Split Array with Equal Sum	medium		🔒
549	Binary Tree Longest Consecutive Sequence II	medium		🔒
551	Student Attendance Record I	easy			✅
552	Student Attendance Record II	hard	cpp		✅
553	Optimal Division	medium
554	Brick Wall	medium
555	Split Concatenated Strings	medium		🔒
556	Next Greater Element III	medium
557	Reverse Words in a String III	easy
560	Subarray Sum Equals K	medium
561	Array Partition I	easy	c		✅
562	Longest Line of Consecutive One in Matrix	medium		🔒
563	Binary Tree Tilt	easy
564	Find the Closest Palindrome	hard
565	Array Nesting	medium	cpp		✅
566	Reshape the Matrix	easy	c		✅
567	Permutation in String	medium
568	Maximum Vacation Days	hard		🔒
569	Median Employee Salary	hard		🔒
570	Managers with at Least 5 Direct Reports	medium		🔒
571	Find Median Given Frequency of Numbers	hard		🔒
572	Subtree of Another Tree	easy
573	Squirrel Simulation	medium		🔒
574	Winning Candidate	medium		🔒
575	Distribute Candies	easy
576	Out of Boundary Paths	medium
577	Employee Bonus	easy		🔒
578	Get Highest Answer Rate Question	medium		🔒
579	Find Cumulative Salary of an Employee	hard		🔒
580	Count Student Number in Departments	medium		🔒
581	Shortest Unsorted Continuous Subarray	easy	c		✅
582	Kill Process	medium		🔒
583	Delete Operation for Two Strings	medium
584	Find Customer Referee	easy		🔒
585	Investments in 2016	medium		🔒
586	Customer Placing the Largest Number of Orders	easy		🔒
587	Erect the Fence	hard
588	Design In-Memory File System	hard		🔒
591	Tag Validator	hard
592	Fraction Addition and Subtraction	medium
593	Valid Square	medium
594	Longest Harmonious Subsequence	easy
595	Big Countries	easy
596	Classes More Than 5 Students	easy
597	Friend Requests I: Overall Acceptance Rate	easy		🔒
598	Range Addition II	easy
599	Minimum Index Sum of Two Lists	easy
600	Non-negative Integers without Consecutive Ones	hard
601	Human Traffic of Stadium	hard
602	Friend Requests II: Who Has the Most Friends	medium		🔒
603	Consecutive Available Seats	easy		🔒
604	Design Compressed String Iterator	easy		🔒
605	Can Place Flowers	easy	c		✅
606	Construct String from Binary Tree	easy
607	Sales Person	easy		🔒
608	Tree Node	medium		🔒
609	Find Duplicate File in System	medium
610	Triangle Judgement	easy		🔒
611	Valid Triangle Number	medium
612	Shortest Distance in a Plane	medium		🔒
613	Shortest Distance in a Line	easy		🔒
614	Second Degree Follower	medium		🔒
615	Average Salary: Departments VS Company	hard		🔒
616	Add Bold Tag in String	medium		🔒
617	Merge Two Binary Trees	easy	c		✅
618	Students Report By Geography	hard		🔒
619	Biggest Single Number	easy		🔒
620	Not Boring Movies	easy
621	Task Scheduler	medium	c		✅
623	Add One Row to Tree	medium
624	Maximum Distance in Arrays	easy		🔒
625	Minimum Factorization	medium		🔒
626	Exchange Seats	medium
627	Swap Salary	easy
628	Maximum Product of Three Numbers	easy	c		✅
629	K Inverse Pairs Array	hard
630	Course Schedule III	hard
631	Design Excel Sum Formula	hard		🔒
632	Smallest Range	hard
633	Sum of Square Numbers	easy
634	Find the Derangement of An Array	medium		🔒
635	Design Log Storage System	medium		🔒
636	Exclusive Time of Functions	medium
637	Average of Levels in Binary Tree	easy
638	Shopping Offers	medium
639	Decode Ways II	hard
640	Solve the Equation	medium
642	Design Search Autocomplete System	hard		🔒
643	Maximum Average Subarray I	easy			✅
644	Maximum Average Subarray II	hard		🔒
645	Set Mismatch	easy
646	Maximum Length of Pair Chain	medium	cpp		✅
647	Palindromic Substrings	medium	cpp		✅
648	Replace Words	medium
649	Dota2 Senate	medium
650	2 Keys Keyboard	medium
651	4 Keys Keyboard	medium		🔒
652	Find Duplicate Subtrees	medium
653	Two Sum IV - Input is a BST	easy
654	Maximum Binary Tree	medium	cpp		✅
655	Print Binary Tree	medium
656	Coin Path	hard		🔒
657	Judge Route Circle	easy			✅
658	Find K Closest Elements	medium	cpp		✅
659	Split Array into Consecutive Subsequences	medium
660	Remove 9	hard		🔒
661	Image Smoother	easy
662	Maximum Width of Binary Tree	medium
663	Equal Tree Partition	medium		🔒
664	Strange Printer	hard
665	Non-decreasing Array	easy			✅
666	Path Sum IV	medium		🔒
667	Beautiful Arrangement II	medium			✅
668	Kth Smallest Number in Multiplication Table	hard	cpp		✅
669	Trim a Binary Search Tree	easy
670	Maximum Swap	medium	cpp		✅
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	c		✅
675	Cut Off Trees for Golf Event	hard
676	Implement Magic Dictionary	medium
677	Map Sum Pairs	medium
678	Valid Parenthesis String	medium
679	24 Game	hard
680	Valid Palindrome II	easy			✅
681	Next Closest Time	medium		🔒
682	Baseball Game	easy			✅
683	K Empty Slots	hard		🔒
684	Redundant Connection	medium
685	Redundant Connection II	hard
686	Repeated String Match	easy
687	Longest Univalue Path	easy
688	Knight Probability in Chessboard	medium
689	Maximum Sum of 3 Non-Overlapping Subarrays	hard	c		✅
690	Employee Importance	easy
691	Stickers to Spell Word	hard
692	Top K Frequent Words	medium
693	Binary Number with Alternating Bits	easy
694	Number of Distinct Islands	medium		🔒
695	Max Area of Island	easy			✅
696	Count Binary Substrings	easy
697	Degree of an Array	easy
698	Partition to K Equal Sum Subsets	medium
699	Falling Squares	hard
711	Number of Distinct Islands II	hard		🔒
712	Minimum ASCII Delete Sum for Two Strings	medium			✅
713	Subarray Product Less Than K	medium	c		✅
714	Best Time to Buy and Sell Stock with Transaction Fee	medium
715	Range Module	hard			❌
716	Max Stack	hard		🔒
717	1-bit and 2-bit Characters	easy			✅
718	Maximum Length of Repeated Subarray	medium	cpp		✅
719	Find K-th Smallest Pair Distance	hard	cpp		✅
720	Longest Word in Dictionary	easy
721	Accounts Merge	medium
722	Remove Comments	medium
723	Candy Crush	medium		🔒
724	Find Pivot Index	easy
725	Split Linked List in Parts	medium
726	Number of Atoms	hard
727	Minimum Window Subsequence	hard		🔒
728	Self Dividing Numbers	easy
729	My Calendar I	medium
730	Count Different Palindromic Subsequences	hard
731	My Calendar II	medium
732	My Calendar III	hard
733	Flood Fill	easy
734	Sentence Similarity	easy		🔒
735	Asteroid Collision	medium
736	Parse Lisp Expression	hard
737	Sentence Similarity II	medium		🔒
738	Monotone Increasing Digits	medium
739	Daily Temperatures	medium
740	Delete and Earn	medium
741	Cherry Pickup	hard
743	Closest Leaf in a Binary Tree	medium		🔒
744	Network Delay Time	medium	cpp
745	Find Smallest Letter Greater Than Target	easy			✅
746	Prefix and Suffix Search	hard
747	Min Cost Climbing Stairs	easy	cpp		✅
748	Largest Number At Least Twice of Others	easy			✅
749	Shortest Completing Word	medium
750	Contain Virus	hard
751	Number Of Corner Rectangles	medium		🔒
752	IP to CIDR	easy		🔒
753	Open the Lock	medium
754	Cracking the Safe	hard
755	Reach a Number	medium
756	Pour Water	medium		🔒
757	Pyramid Transition Matrix	medium
759	Set Intersection Size At Least Two	hard
760	Bold Words in String	easy		🔒
761	Employee Free Time	hard		🔒
762	Find Anagram Mappings	easy		🔒
763	Special Binary String	hard
767	Prime Number of Set Bits in Binary Representation	easy
768	Partition Labels	medium
769	Largest Plus Sign	medium
770	Couples Holding Hands	hard
777	Toeplitz Matrix	easy			✅
778	Reorganize String	medium	cpp
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			✅
785	Basic Calculator III	hard		🔒
787	Sliding Puzzle	hard
788	Minimize Max Distance to Gas Station	hard		🔒
790	Global and Local Inversions	medium			✅
791	Split BST	medium		🔒
793	Swap Adjacent in LR String	medium	cpp
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	easy
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			✅
818	Similar RGB Color	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			✅

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