每日一题活动！冲啊！

截止到 2020-10-08 10:54:09, 我已经完成了 103 / 1468 的题目， 还有 231 道题目未解锁:lock:（就是没买）.

完成情况统计（我都是用Python写的，思路记录在了Markdown里）:

1. Markdown: 103
2. Python: 0

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LeetCode题解

ID	Title	Difficulty	Markdown	Python
001	Two Sum	Easy	Markdown	To Do
002	Add Two Numbers	Medium	Markdown	To Do
003	Longest Substring Without Repeating Characters	Medium	Markdown	To Do
004	Median of Two Sorted Arrays	Hard	To Do	To Do
005	Longest Palindromic Substring	Medium	To Do	To Do
006	ZigZag Conversion	Medium	To Do	To Do
007	Reverse Integer	Easy	To Do	To Do
008	String to Integer (atoi)	Medium	To Do	To Do
009	Palindrome Number	Easy	To Do	To Do
010	Regular Expression Matching	Hard	To Do	To Do
011	Container With Most Water	Medium	To Do	To Do
012	Integer to Roman	Medium	To Do	To Do
013	Roman to Integer	Easy	To Do	To Do
014	Longest Common Prefix	Easy	To Do	To Do
015	3Sum	Medium	To Do	To Do
016	3Sum Closest	Medium	To Do	To Do
017	Letter Combinations of a Phone Number	Medium	To Do	To Do
018	4Sum	Medium	To Do	To Do
019	Remove Nth Node From End of List	Medium	Markdown	To Do
020	Valid Parentheses	Easy	Markdown	To Do
021	Merge Two Sorted Lists	Easy	Markdown	To Do
022	Generate Parentheses	Medium	To Do	To Do
023	Merge k Sorted Lists	Hard	To Do	To Do
024	Swap Nodes in Pairs	Medium	Markdown	To Do
025	Reverse Nodes in k-Group	Hard	To Do	To Do
026	Remove Duplicates from Sorted Array	Easy	To Do	To Do
027	Remove Element	Easy	To Do	To Do
028	Implement strStr()	Easy	To Do	To Do
029	Divide Two Integers	Medium	To Do	To Do
030	Substring with Concatenation of All Words	Hard	To Do	To Do
031	Next Permutation	Medium	To Do	To Do
032	Longest Valid Parentheses	Hard	To Do	To Do
033	Search in Rotated Sorted Array	Medium	To Do	To Do
034	Find First and Last Position of Element in Sorted Array	Medium	Markdown	To Do
035	Search Insert Position	Easy	To Do	To Do
036	Valid Sudoku	Medium	To Do	To Do
037	Sudoku Solver	Hard	To Do	To Do
038	Count and Say	Easy	To Do	To Do
039	Combination Sum	Medium	To Do	To Do
040	Combination Sum II	Medium	To Do	To Do
041	First Missing Positive	Hard	To Do	To Do
042	Trapping Rain Water	Hard	To Do	To Do
043	Multiply Strings	Medium	To Do	To Do
044	Wildcard Matching	Hard	To Do	To Do
045	Jump Game II	Hard	To Do	To Do
046	Permutations	Medium	To Do	To Do
047	Permutations II	Medium	To Do	To Do
048	Rotate Image	Medium	To Do	To Do
049	Group Anagrams	Medium	To Do	To Do
050	Pow(x, n)	Medium	To Do	To Do
051	N-Queens	Hard	To Do	To Do
052	N-Queens II	Hard	To Do	To Do
053	Maximum Subarray	Easy	To Do	To Do
054	Spiral Matrix	Medium	To Do	To Do
055	Jump Game	Medium	To Do	To Do
056	Merge Intervals	Medium	Markdown	To Do
057	Insert Interval	Medium	Markdown	To Do
058	Length of Last Word	Easy	To Do	To Do
059	Spiral Matrix II	Medium	To Do	To Do
060	Permutation Sequence	Hard	To Do	To Do
061	Rotate List	Medium	To Do	To Do
062	Unique Paths	Medium	Markdown	To Do
063	Unique Paths II	Medium	To Do	To Do
064	Minimum Path Sum	Medium	Markdown	To Do
065	Valid Number	Hard	To Do	To Do
066	Plus One	Easy	To Do	To Do
067	Add Binary	Easy	To Do	To Do
068	Text Justification	Hard	To Do	To Do
069	Sqrt(x)	Easy	Markdown	To Do
070	Climbing Stairs	Easy	Markdown	To Do
071	Simplify Path	Medium	To Do	To Do
072	Edit Distance	Hard	Markdown	To Do
073	Set Matrix Zeroes	Medium	To Do	To Do
074	Search a 2D Matrix	Medium	To Do	To Do
075	Sort Colors	Medium	To Do	To Do
076	Minimum Window Substring	Hard	To Do	To Do
077	Combinations	Medium	To Do	To Do
078	Subsets	Medium	To Do	To Do
079	Word Search	Medium	To Do	To Do
080	Remove Duplicates from Sorted Array II	Medium	To Do	To Do
081	Search in Rotated Sorted Array II	Medium	To Do	To Do
082	Remove Duplicates from Sorted List II	Medium	To Do	To Do
083	Remove Duplicates from Sorted List	Easy	Markdown	To Do
084	Largest Rectangle in Histogram	Hard	To Do	To Do
085	Maximal Rectangle	Hard	To Do	To Do
086	Partition List	Medium	To Do	To Do
087	Scramble String	Hard	To Do	To Do
088	Merge Sorted Array	Easy	Markdown	To Do
089	Gray Code	Medium	To Do	To Do
090	Subsets II	Medium	To Do	To Do
091	Decode Ways	Medium	Markdown	To Do
092	Reverse Linked List II	Medium	To Do	To Do
093	Restore IP Addresses	Medium	To Do	To Do
094	Binary Tree Inorder Traversal	Medium	Markdown	To Do
095	Unique Binary Search Trees II	Medium	To Do	To Do
096	Unique Binary Search Trees	Medium	To Do	To Do
097	Interleaving String	Hard	To Do	To Do
098	Validate Binary Search Tree	Medium	To Do	To Do
099	Recover Binary Search Tree	Hard	To Do	To Do
100	Same Tree	Easy	To Do	To Do
101	Symmetric Tree	Easy	Markdown	To Do
102	Binary Tree Level Order Traversal	Medium	To Do	To Do
103	Binary Tree Zigzag Level Order Traversal	Medium	To Do	To Do
104	Maximum Depth of Binary Tree	Easy	Markdown	To Do
105	Construct Binary Tree from Preorder and Inorder Traversal	Medium	To Do	To Do
106	Construct Binary Tree from Inorder and Postorder Traversal	Medium	To Do	To Do
107	Binary Tree Level Order Traversal II	Easy	To Do	To Do
108	Convert Sorted Array to Binary Search Tree	Easy	Markdown	To Do
109	Convert Sorted List to Binary Search Tree	Medium	Markdown	To Do
110	Balanced Binary Tree	Easy	Markdown	To Do
111	Minimum Depth of Binary Tree	Easy	Markdown	To Do
112	Path Sum	Easy	Markdown	To Do
113	Path Sum II	Medium	To Do	To Do
114	Flatten Binary Tree to Linked List	Medium	Markdown	To Do
115	Distinct Subsequences	Hard	To Do	To Do
116	Populating Next Right Pointers in Each Node	Medium	To Do	To Do
117	Populating Next Right Pointers in Each Node II	Medium	To Do	To Do
118	Pascal's Triangle	Easy	To Do	To Do
119	Pascal's Triangle II	Easy	To Do	To Do
120	Triangle	Medium	To Do	To Do
121	Best Time to Buy and Sell Stock	Easy	Markdown	To Do
122	Best Time to Buy and Sell Stock II	Easy	Markdown	To Do
123	Best Time to Buy and Sell Stock III	Hard	Markdown	To Do
124	Binary Tree Maximum Path Sum	Hard	To Do	To Do
125	Valid Palindrome	Easy	To Do	To Do
126	Word Ladder II	Hard	To Do	To Do
127	Word Ladder	Medium	To Do	To Do
128	Longest Consecutive Sequence	Hard	To Do	To Do
129	Sum Root to Leaf Numbers	Medium	To Do	To Do
130	Surrounded Regions	Medium	To Do	To Do
131	Palindrome Partitioning	Medium	To Do	To Do
132	Palindrome Partitioning II	Hard	To Do	To Do
133	Clone Graph	Medium	To Do	To Do
134	Gas Station	Medium	To Do	To Do
135	Candy	Hard	Markdown	To Do
136	Single Number	Easy	To Do	To Do
137	Single Number II	Medium	To Do	To Do
138	Copy List with Random Pointer	Medium	To Do	To Do
139	Word Break	Medium	Markdown	To Do
140	Word Break II	Hard	To Do	To Do
141	Linked List Cycle	Easy	Markdown	To Do
142	Linked List Cycle II	Medium	To Do	To Do
143	Reorder List	Medium	To Do	To Do
144	Binary Tree Preorder Traversal	Medium	Markdown	To Do
145	Binary Tree Postorder Traversal	Medium	Markdown	To Do
146	LRU Cache	Medium	To Do	To Do
147	Insertion Sort List	Medium	Markdown	To Do
148	Sort List	Medium	To Do	To Do
149	Max Points on a Line	Hard	To Do	To Do
150	Evaluate Reverse Polish Notation	Medium	To Do	To Do
151	Reverse Words in a String	Medium	To Do	To Do
152	Maximum Product Subarray	Medium	To Do	To Do
153	Find Minimum in Rotated Sorted Array	Medium	Markdown	To Do
154	Find Minimum in Rotated Sorted Array II	Hard	To Do	To Do
155	Min Stack	Easy	Markdown	To Do
156	Binary Tree Upside Down 🔒	Medium	To Do	To Do
157	Read N Characters Given Read4 🔒	Easy	To Do	To Do
158	Read N Characters Given Read4 II - Call multiple times 🔒	Hard	To Do	To Do
159	Longest Substring with At Most Two Distinct Characters 🔒	Medium	To Do	To Do
160	Intersection of Two Linked Lists	Easy	Markdown	To Do
161	One Edit Distance 🔒	Medium	To Do	To Do
162	Find Peak Element	Medium	To Do	To Do
163	Missing Ranges 🔒	Medium	To Do	To Do
164	Maximum Gap	Hard	To Do	To Do
165	Compare Version Numbers	Medium	To Do	To Do
166	Fraction to Recurring Decimal	Medium	To Do	To Do
167	Two Sum II - Input array is sorted	Easy	Markdown	To Do
168	Excel Sheet Column Title	Easy	To Do	To Do
169	Majority Element	Easy	To Do	To Do
170	Two Sum III - Data structure design 🔒	Easy	To Do	To Do
171	Excel Sheet Column Number	Easy	To Do	To Do
172	Factorial Trailing Zeroes	Easy	To Do	To Do
173	Binary Search Tree Iterator	Medium	To Do	To Do
174	Dungeon Game	Hard	To Do	To Do
179	Largest Number	Medium	To Do	To Do
186	Reverse Words in a String II 🔒	Medium	To Do	To Do
187	Repeated DNA Sequences	Medium	To Do	To Do
188	Best Time to Buy and Sell Stock IV	Hard	Markdown	To Do
189	Rotate Array	Easy	Markdown	To Do
190	Reverse Bits	Easy	To Do	To Do
191	Number of 1 Bits	Easy	To Do	To Do
198	House Robber	Easy	To Do	To Do
199	Binary Tree Right Side View	Medium	To Do	To Do
200	Number of Islands	Medium	To Do	To Do
201	Bitwise AND of Numbers Range	Medium	To Do	To Do
202	Happy Number	Easy	To Do	To Do
203	Remove Linked List Elements	Easy	To Do	To Do
204	Count Primes	Easy	To Do	To Do
205	Isomorphic Strings	Easy	To Do	To Do
206	Reverse Linked List	Easy	Markdown	To Do
207	Course Schedule	Medium	To Do	To Do
208	Implement Trie (Prefix Tree)	Medium	To Do	To Do
209	Minimum Size Subarray Sum	Medium	To Do	To Do
210	Course Schedule II	Medium	To Do	To Do
211	Design Add and Search Words Data Structure	Medium	To Do	To Do
212	Word Search II	Hard	To Do	To Do
213	House Robber II	Medium	Markdown	To Do
214	Shortest Palindrome	Hard	To Do	To Do
215	Kth Largest Element in an Array	Medium	To Do	To Do
216	Combination Sum III	Medium	To Do	To Do
217	Contains Duplicate	Easy	To Do	To Do
218	The Skyline Problem	Hard	To Do	To Do
219	Contains Duplicate II	Easy	To Do	To Do
220	Contains Duplicate III	Medium	To Do	To Do
221	Maximal Square	Medium	To Do	To Do
222	Count Complete Tree Nodes	Medium	To Do	To Do
223	Rectangle Area	Medium	To Do	To Do
224	Basic Calculator	Hard	To Do	To Do
225	Implement Stack using Queues	Easy	Markdown	To Do
226	Invert Binary Tree	Easy	Markdown	To Do
227	Basic Calculator II	Medium	To Do	To Do
228	Summary Ranges	Medium	To Do	To Do
229	Majority Element II	Medium	To Do	To Do
230	Kth Smallest Element in a BST	Medium	Markdown	To Do
231	Power of Two	Easy	To Do	To Do
232	Implement Queue using Stacks	Easy	Markdown	To Do
233	Number of Digit One	Hard	To Do	To Do
234	Palindrome Linked List	Easy	Markdown	To Do
235	Lowest Common Ancestor of a Binary Search Tree	Easy	Markdown	To Do
236	Lowest Common Ancestor of a Binary Tree	Medium	Markdown	To Do
237	Delete Node in a Linked List	Easy	To Do	To Do
238	Product of Array Except Self	Medium	To Do	To Do
239	Sliding Window Maximum	Hard	To Do	To Do
240	Search a 2D Matrix II	Medium	Markdown	To Do
241	Different Ways to Add Parentheses	Medium	To Do	To Do
242	Valid Anagram	Easy	To Do	To Do
243	Shortest Word Distance 🔒	Easy	To Do	To Do
244	Shortest Word Distance II 🔒	Medium	To Do	To Do
245	Shortest Word Distance III 🔒	Medium	To Do	To Do
246	Strobogrammatic Number 🔒	Easy	To Do	To Do
247	Strobogrammatic Number II 🔒	Medium	To Do	To Do
248	Strobogrammatic Number III 🔒	Hard	To Do	To Do
249	Group Shifted Strings 🔒	Medium	To Do	To Do
250	Count Univalue Subtrees 🔒	Medium	To Do	To Do
251	Flatten 2D Vector 🔒	Medium	To Do	To Do
252	Meeting Rooms 🔒	Easy	To Do	To Do
253	Meeting Rooms II 🔒	Medium	To Do	To Do
254	Factor Combinations 🔒	Medium	To Do	To Do
255	Verify Preorder Sequence in Binary Search Tree 🔒	Medium	To Do	To Do
256	Paint House 🔒	Medium	To Do	To Do
257	Binary Tree Paths	Easy	To Do	To Do
258	Add Digits	Easy	To Do	To Do
259	3Sum Smaller 🔒	Medium	To Do	To Do
260	Single Number III	Medium	To Do	To Do
261	Graph Valid Tree 🔒	Medium	To Do	To Do
263	Ugly Number	Easy	To Do	To Do
264	Ugly Number II	Medium	To Do	To Do
265	Paint House II 🔒	Hard	To Do	To Do
266	Palindrome Permutation 🔒	Easy	To Do	To Do
267	Palindrome Permutation II 🔒	Medium	To Do	To Do
268	Missing Number	Easy	To Do	To Do
269	Alien Dictionary 🔒	Hard	To Do	To Do
270	Closest Binary Search Tree Value 🔒	Easy	To Do	To Do
271	Encode and Decode Strings 🔒	Medium	To Do	To Do
272	Closest Binary Search Tree Value II 🔒	Hard	To Do	To Do
273	Integer to English Words	Hard	To Do	To Do
274	H-Index	Medium	To Do	To Do
275	H-Index II	Medium	To Do	To Do
276	Paint Fence 🔒	Easy	To Do	To Do
277	Find the Celebrity 🔒	Medium	To Do	To Do
278	First Bad Version	Easy	Markdown	To Do
279	Perfect Squares	Medium	Markdown	To Do
280	Wiggle Sort 🔒	Medium	To Do	To Do
281	Zigzag Iterator 🔒	Medium	To Do	To Do
282	Expression Add Operators	Hard	To Do	To Do
283	Move Zeroes	Easy	Markdown	To Do
284	Peeking Iterator	Medium	To Do	To Do
285	Inorder Successor in BST 🔒	Medium	To Do	To Do
286	Walls and Gates 🔒	Medium	To Do	To Do
287	Find the Duplicate Number	Medium	To Do	To Do
288	Unique Word Abbreviation 🔒	Medium	To Do	To Do
289	Game of Life	Medium	To Do	To Do
290	Word Pattern	Easy	To Do	To Do
291	Word Pattern II 🔒	Hard	To Do	To Do
292	Nim Game	Easy	To Do	To Do
293	Flip Game 🔒	Easy	To Do	To Do
294	Flip Game II 🔒	Medium	To Do	To Do
295	Find Median from Data Stream	Hard	To Do	To Do
296	Best Meeting Point 🔒	Hard	To Do	To Do
297	Serialize and Deserialize Binary Tree	Hard	To Do	To Do
298	Binary Tree Longest Consecutive Sequence 🔒	Medium	To Do	To Do
299	Bulls and Cows	Medium	To Do	To Do
300	Longest Increasing Subsequence	Medium	Markdown	To Do
301	Remove Invalid Parentheses	Hard	To Do	To Do
302	Smallest Rectangle Enclosing Black Pixels 🔒	Hard	To Do	To Do
303	Range Sum Query - Immutable	Easy	Markdown	To Do
304	Range Sum Query 2D - Immutable	Medium	To Do	To Do
305	Number of Islands II 🔒	Hard	To Do	To Do
306	Additive Number	Medium	To Do	To Do
307	Range Sum Query - Mutable	Medium	To Do	To Do
308	Range Sum Query 2D - Mutable 🔒	Hard	To Do	To Do
309	Best Time to Buy and Sell Stock with Cooldown	Medium	Markdown	To Do
310	Minimum Height Trees	Medium	To Do	To Do
311	Sparse Matrix Multiplication 🔒	Medium	To Do	To Do
312	Burst Balloons	Hard	To Do	To Do
313	Super Ugly Number	Medium	To Do	To Do
314	Binary Tree Vertical Order Traversal 🔒	Medium	To Do	To Do
315	Count of Smaller Numbers After Self	Hard	To Do	To Do
316	Remove Duplicate Letters	Medium	To Do	To Do
317	Shortest Distance from All Buildings 🔒	Hard	To Do	To Do
318	Maximum Product of Word Lengths	Medium	To Do	To Do
319	Bulb Switcher	Medium	To Do	To Do
320	Generalized Abbreviation 🔒	Medium	To Do	To Do
321	Create Maximum Number	Hard	To Do	To Do
322	Coin Change	Medium	Markdown	To Do
323	Number of Connected Components in an Undirected Graph 🔒	Medium	To Do	To Do
324	Wiggle Sort II	Medium	To Do	To Do
325	Maximum Size Subarray Sum Equals k 🔒	Medium	To Do	To Do
326	Power of Three	Easy	To Do	To Do
327	Count of Range Sum	Hard	To Do	To Do
328	Odd Even Linked List	Medium	Markdown	To Do
329	Longest Increasing Path in a Matrix	Hard	To Do	To Do
330	Patching Array	Hard	To Do	To Do
331	Verify Preorder Serialization of a Binary Tree	Medium	To Do	To Do
332	Reconstruct Itinerary	Medium	To Do	To Do
333	Largest BST Subtree 🔒	Medium	To Do	To Do
334	Increasing Triplet Subsequence	Medium	To Do	To Do
335	Self Crossing	Hard	To Do	To Do
336	Palindrome Pairs	Hard	To Do	To Do
337	House Robber III	Medium	Markdown	To Do
338	Counting Bits	Medium	To Do	To Do
339	Nested List Weight Sum 🔒	Easy	To Do	To Do
340	Longest Substring with At Most K Distinct Characters 🔒	Hard	To Do	To Do
341	Flatten Nested List Iterator	Medium	To Do	To Do
342	Power of Four	Easy	To Do	To Do
343	Integer Break	Medium	Markdown	To Do
344	Reverse String	Easy	To Do	To Do
345	Reverse Vowels of a String	Easy	Markdown	To Do
346	Moving Average from Data Stream 🔒	Easy	To Do	To Do
347	Top K Frequent Elements	Medium	To Do	To Do
348	Design Tic-Tac-Toe 🔒	Medium	To Do	To Do
349	Intersection of Two Arrays	Easy	To Do	To Do
350	Intersection of Two Arrays II	Easy	To Do	To Do
351	Android Unlock Patterns 🔒	Medium	To Do	To Do
352	Data Stream as Disjoint Intervals	Hard	To Do	To Do
353	Design Snake Game 🔒	Medium	To Do	To Do
354	Russian Doll Envelopes	Hard	To Do	To Do
355	Design Twitter	Medium	To Do	To Do
356	Line Reflection 🔒	Medium	To Do	To Do
357	Count Numbers with Unique Digits	Medium	To Do	To Do
358	Rearrange String k Distance Apart 🔒	Hard	To Do	To Do
359	Logger Rate Limiter 🔒	Easy	To Do	To Do
360	Sort Transformed Array 🔒	Medium	To Do	To Do
361	Bomb Enemy 🔒	Medium	To Do	To Do
362	Design Hit Counter 🔒	Medium	To Do	To Do
363	Max Sum of Rectangle No Larger Than K	Hard	To Do	To Do
364	Nested List Weight Sum II 🔒	Medium	To Do	To Do
365	Water and Jug Problem	Medium	To Do	To Do
366	Find Leaves of Binary Tree 🔒	Medium	To Do	To Do
367	Valid Perfect Square	Easy	To Do	To Do
368	Largest Divisible Subset	Medium	To Do	To Do
369	Plus One Linked List 🔒	Medium	To Do	To Do
370	Range Addition 🔒	Medium	To Do	To Do
371	Sum of Two Integers	Medium	To Do	To Do
372	Super Pow	Medium	To Do	To Do
373	Find K Pairs with Smallest Sums	Medium	To Do	To Do
374	Guess Number Higher or Lower	Easy	To Do	To Do
375	Guess Number Higher or Lower II	Medium	To Do	To Do
376	Wiggle Subsequence	Medium	Markdown	To Do
377	Combination Sum IV	Medium	Markdown	To Do
378	Kth Smallest Element in a Sorted Matrix	Medium	To Do	To Do
379	Design Phone Directory 🔒	Medium	To Do	To Do
380	Insert Delete GetRandom O(1)	Medium	To Do	To Do
381	Insert Delete GetRandom O(1) - Duplicates allowed	Hard	To Do	To Do
382	Linked List Random Node	Medium	To Do	To Do
383	Ransom Note	Easy	To Do	To Do
384	Shuffle an Array	Medium	To Do	To Do
385	Mini Parser	Medium	To Do	To Do
386	Lexicographical Numbers	Medium	To Do	To Do
387	First Unique Character in a String	Easy	To Do	To Do
388	Longest Absolute File Path	Medium	To Do	To Do
389	Find the Difference	Easy	To Do	To Do
390	Elimination Game	Medium	To Do	To Do
391	Perfect Rectangle	Hard	To Do	To Do
392	Is Subsequence	Easy	To Do	To Do
393	UTF-8 Validation	Medium	To Do	To Do
394	Decode String	Medium	To Do	To Do
395	Longest Substring with At Least K Repeating Characters	Medium	To Do	To Do
396	Rotate Function	Medium	To Do	To Do
397	Integer Replacement	Medium	To Do	To Do
398	Random Pick Index	Medium	To Do	To Do
399	Evaluate Division	Medium	To Do	To Do
400	Nth Digit	Medium	To Do	To Do
401	Binary Watch	Easy	To Do	To Do
402	Remove K Digits	Medium	To Do	To Do
403	Frog Jump	Hard	To Do	To Do
404	Sum of Left Leaves	Easy	Markdown	To Do
405	Convert a Number to Hexadecimal	Easy	To Do	To Do
406	Queue Reconstruction by Height	Medium	To Do	To Do
407	Trapping Rain Water II	Hard	To Do	To Do
408	Valid Word Abbreviation 🔒	Easy	To Do	To Do
409	Longest Palindrome	Easy	To Do	To Do
410	Split Array Largest Sum	Hard	To Do	To Do
411	Minimum Unique Word Abbreviation 🔒	Hard	To Do	To Do
412	Fizz Buzz	Easy	To Do	To Do
413	Arithmetic Slices	Medium	Markdown	To Do
414	Third Maximum Number	Easy	To Do	To Do
415	Add Strings	Easy	To Do	To Do
416	Partition Equal Subset Sum	Medium	Markdown	To Do
417	Pacific Atlantic Water Flow	Medium	To Do	To Do
418	Sentence Screen Fitting 🔒	Medium	To Do	To Do
419	Battleships in a Board	Medium	To Do	To Do
420	Strong Password Checker	Hard	To Do	To Do
421	Maximum XOR of Two Numbers in an Array	Medium	To Do	To Do
422	Valid Word Square 🔒	Easy	To Do	To Do
423	Reconstruct Original Digits from English	Medium	To Do	To Do
424	Longest Repeating Character Replacement	Medium	To Do	To Do
425	Word Squares 🔒	Hard	To Do	To Do
432	All O`one Data Structure	Hard	To Do	To Do
433	Minimum Genetic Mutation	Medium	To Do	To Do
434	Number of Segments in a String	Easy	To Do	To Do
435	Non-overlapping Intervals	Medium	To Do	To Do
436	Find Right Interval	Medium	To Do	To Do
437	Path Sum III	Medium	Markdown	To Do
438	Find All Anagrams in a String	Medium	To Do	To Do
439	Ternary Expression Parser 🔒	Medium	To Do	To Do
440	K-th Smallest in Lexicographical Order	Hard	To Do	To Do
441	Arranging Coins	Easy	To Do	To Do
442	Find All Duplicates in an Array	Medium	To Do	To Do
443	String Compression	Medium	To Do	To Do
444	Sequence Reconstruction 🔒	Medium	To Do	To Do
445	Add Two Numbers II	Medium	Markdown	To Do
446	Arithmetic Slices II - Subsequence	Hard	To Do	To Do
447	Number of Boomerangs	Easy	To Do	To Do
448	Find All Numbers Disappeared in an Array	Easy	To Do	To Do
449	Serialize and Deserialize BST	Medium	To Do	To Do
450	Delete Node in a BST	Medium	To Do	To Do
451	Sort Characters By Frequency	Medium	To Do	To Do
452	Minimum Number of Arrows to Burst Balloons	Medium	To Do	To Do
453	Minimum Moves to Equal Array Elements	Easy	To Do	To Do
454	4Sum II	Medium	To Do	To Do
455	Assign Cookies	Easy	Markdown	To Do
456	132 Pattern	Medium	To Do	To Do
457	Circular Array Loop	Medium	To Do	To Do
458	Poor Pigs	Hard	To Do	To Do
459	Repeated Substring Pattern	Easy	To Do	To Do
460	LFU Cache	Hard	To Do	To Do
461	Hamming Distance	Easy	To Do	To Do
462	Minimum Moves to Equal Array Elements II	Medium	To Do	To Do
463	Island Perimeter	Easy	To Do	To Do
464	Can I Win	Medium	To Do	To Do
465	Optimal Account Balancing 🔒	Hard	To Do	To Do
466	Count The Repetitions	Hard	To Do	To Do
467	Unique Substrings in Wraparound String	Medium	To Do	To Do
468	Validate IP Address	Medium	To Do	To Do
469	Convex Polygon 🔒	Medium	To Do	To Do
471	Encode String with Shortest Length 🔒	Hard	To Do	To Do
472	Concatenated Words	Hard	To Do	To Do
473	Matchsticks to Square	Medium	To Do	To Do
474	Ones and Zeroes	Medium	Markdown	To Do
475	Heaters	Easy	To Do	To Do
476	Number Complement	Easy	To Do	To Do
477	Total Hamming Distance	Medium	To Do	To Do
479	Largest Palindrome Product	Hard	To Do	To Do
480	Sliding Window Median	Hard	To Do	To Do
481	Magical String	Medium	To Do	To Do
482	License Key Formatting	Easy	To Do	To Do
483	Smallest Good Base	Hard	To Do	To Do
484	Find Permutation 🔒	Medium	To Do	To Do
485	Max Consecutive Ones	Easy	Markdown	To Do
486	Predict the Winner	Medium	To Do	To Do
487	Max Consecutive Ones II 🔒	Medium	To Do	To Do
488	Zuma Game	Hard	To Do	To Do
490	The Maze 🔒	Medium	To Do	To Do
491	Increasing Subsequences	Medium	To Do	To Do
492	Construct the Rectangle	Easy	To Do	To Do
493	Reverse Pairs	Hard	To Do	To Do
494	Target Sum	Medium	Markdown	To Do
495	Teemo Attacking	Medium	To Do	To Do
496	Next Greater Element I	Easy	To Do	To Do
498	Diagonal Traverse	Medium	To Do	To Do
499	The Maze III 🔒	Hard	To Do	To Do
500	Keyboard Row	Easy	To Do	To Do
501	Find Mode in Binary Search Tree	Easy	Markdown	To Do
502	IPO	Hard	To Do	To Do
503	Next Greater Element II	Medium	Markdown	To Do
504	Base 7	Easy	To Do	To Do
505	The Maze II 🔒	Medium	To Do	To Do
506	Relative Ranks	Easy	To Do	To Do
507	Perfect Number	Easy	To Do	To Do
508	Most Frequent Subtree Sum	Medium	To Do	To Do
510	Inorder Successor in BST II 🔒	Medium	To Do	To Do
1059	All Paths from Source Lead to Destination 🔒	Medium	To Do	To Do
513	Find Bottom Left Tree Value	Medium	Markdown	To Do
514	Freedom Trail	Hard	To Do	To Do
515	Find Largest Value in Each Tree Row	Medium	To Do	To Do
516	Longest Palindromic Subsequence	Medium	To Do	To Do
517	Super Washing Machines	Hard	To Do	To Do
518	Coin Change 2	Medium	Markdown	To Do
520	Detect Capital	Easy	To Do	To Do
521	Longest Uncommon Subsequence I	Easy	To Do	To Do
522	Longest Uncommon Subsequence II	Medium	To Do	To Do
523	Continuous Subarray Sum	Medium	To Do	To Do
524	Longest Word in Dictionary through Deleting	Medium	Markdown	To Do
525	Contiguous Array	Medium	To Do	To Do
526	Beautiful Arrangement	Medium	To Do	To Do
527	Word Abbreviation 🔒	Hard	To Do	To Do
529	Minesweeper	Medium	To Do	To Do
530	Minimum Absolute Difference in BST	Easy	Markdown	To Do
531	Lonely Pixel I 🔒	Medium	To Do	To Do
532	K-diff Pairs in an Array	Medium	To Do	To Do
533	Lonely Pixel II 🔒	Medium	To Do	To Do
535	Encode and Decode TinyURL	Medium	To Do	To Do
536	Construct Binary Tree from String 🔒	Medium	To Do	To Do
537	Complex Number Multiplication	Medium	To Do	To Do
538	Convert BST to Greater Tree	Medium	Markdown	To Do
539	Minimum Time Difference	Medium	To Do	To Do
540	Single Element in a Sorted Array	Medium	Markdown	To Do
541	Reverse String II	Easy	To Do	To Do
542	01 Matrix	Medium	To Do	To Do
543	Diameter of Binary Tree	Easy	Markdown	To Do
544	Output Contest Matches 🔒	Medium	To Do	To Do
545	Boundary of Binary Tree 🔒	Medium	To Do	To Do
546	Remove Boxes	Hard	To Do	To Do
547	Friend Circles	Medium	To Do	To Do
548	Split Array with Equal Sum 🔒	Medium	To Do	To Do
549	Binary Tree Longest Consecutive Sequence II 🔒	Medium	To Do	To Do
551	Student Attendance Record I	Easy	To Do	To Do
552	Student Attendance Record II	Hard	To Do	To Do
553	Optimal Division	Medium	To Do	To Do
554	Brick Wall	Medium	To Do	To Do
555	Split Concatenated Strings 🔒	Medium	To Do	To Do
556	Next Greater Element III	Medium	To Do	To Do
557	Reverse Words in a String III	Easy	To Do	To Do
560	Subarray Sum Equals K	Medium	To Do	To Do
561	Array Partition I	Easy	To Do	To Do
562	Longest Line of Consecutive One in Matrix 🔒	Medium	To Do	To Do
563	Binary Tree Tilt	Easy	To Do	To Do
564	Find the Closest Palindrome	Hard	To Do	To Do
565	Array Nesting	Medium	To Do	To Do
566	Reshape the Matrix	Easy	Markdown	To Do
567	Permutation in String	Medium	To Do	To Do
568	Maximum Vacation Days 🔒	Hard	To Do	To Do
572	Subtree of Another Tree	Easy	Markdown	To Do
573	Squirrel Simulation 🔒	Medium	To Do	To Do
575	Distribute Candies	Easy	To Do	To Do
576	Out of Boundary Paths	Medium	To Do	To Do
581	Shortest Unsorted Continuous Subarray	Easy	To Do	To Do
582	Kill Process 🔒	Medium	To Do	To Do
583	Delete Operation for Two Strings	Medium	Markdown	To Do
587	Erect the Fence	Hard	To Do	To Do
588	Design In-Memory File System 🔒	Hard	To Do	To Do
591	Tag Validator	Hard	To Do	To Do
592	Fraction Addition and Subtraction	Medium	To Do	To Do
593	Valid Square	Medium	To Do	To Do
594	Longest Harmonious Subsequence	Easy	To Do	To Do
598	Range Addition II	Easy	To Do	To Do
599	Minimum Index Sum of Two Lists	Easy	To Do	To Do
600	Non-negative Integers without Consecutive Ones	Hard	To Do	To Do
604	Design Compressed String Iterator 🔒	Easy	To Do	To Do
605	Can Place Flowers	Easy	To Do	To Do
606	Construct String from Binary Tree	Easy	To Do	To Do
609	Find Duplicate File in System	Medium	To Do	To Do
611	Valid Triangle Number	Medium	To Do	To Do
616	Add Bold Tag in String 🔒	Medium	To Do	To Do
617	Merge Two Binary Trees	Easy	Markdown	To Do
621	Task Scheduler	Medium	To Do	To Do
623	Add One Row to Tree	Medium	To Do	To Do
624	Maximum Distance in Arrays 🔒	Medium	To Do	To Do
625	Minimum Factorization 🔒	Medium	To Do	To Do
628	Maximum Product of Three Numbers	Easy	To Do	To Do
629	K Inverse Pairs Array	Hard	To Do	To Do
630	Course Schedule III	Hard	To Do	To Do
631	Design Excel Sum Formula 🔒	Hard	To Do	To Do
632	Smallest Range Covering Elements from K Lists	Hard	To Do	To Do
633	Sum of Square Numbers	Medium	Markdown	To Do
634	Find the Derangement of An Array 🔒	Medium	To Do	To Do
635	Design Log Storage System 🔒	Medium	To Do	To Do
636	Exclusive Time of Functions	Medium	To Do	To Do
637	Average of Levels in Binary Tree	Easy	Markdown	To Do
638	Shopping Offers	Medium	To Do	To Do
639	Decode Ways II	Hard	To Do	To Do
640	Solve the Equation	Medium	To Do	To Do
642	Design Search Autocomplete System 🔒	Hard	To Do	To Do
643	Maximum Average Subarray I	Easy	To Do	To Do
644	Maximum Average Subarray II 🔒	Hard	To Do	To Do
645	Set Mismatch	Easy	To Do	To Do
646	Maximum Length of Pair Chain	Medium	Markdown	To Do
647	Palindromic Substrings	Medium	To Do	To Do
648	Replace Words	Medium	To Do	To Do
649	Dota2 Senate	Medium	To Do	To Do
650	2 Keys Keyboard	Medium	Markdown	To Do
651	4 Keys Keyboard 🔒	Medium	To Do	To Do
652	Find Duplicate Subtrees	Medium	To Do	To Do
653	Two Sum IV - Input is a BST	Easy	Markdown	To Do
654	Maximum Binary Tree	Medium	To Do	To Do
655	Print Binary Tree	Medium	To Do	To Do
656	Coin Path 🔒	Hard	To Do	To Do
657	Robot Return to Origin	Easy	To Do	To Do
658	Find K Closest Elements	Medium	To Do	To Do
659	Split Array into Consecutive Subsequences	Medium	To Do	To Do
660	Remove 9 🔒	Hard	To Do	To Do
661	Image Smoother	Easy	To Do	To Do
662	Maximum Width of Binary Tree	Medium	To Do	To Do
663	Equal Tree Partition 🔒	Medium	To Do	To Do
664	Strange Printer	Hard	To Do	To Do
665	Non-decreasing Array	Easy	To Do	To Do
666	Path Sum IV 🔒	Medium	To Do	To Do
667	Beautiful Arrangement II	Medium	To Do	To Do
668	Kth Smallest Number in Multiplication Table	Hard	To Do	To Do
669	Trim a Binary Search Tree	Easy	Markdown	To Do
670	Maximum Swap	Medium	To Do	To Do
671	Second Minimum Node In a Binary Tree	Easy	Markdown	To Do
672	Bulb Switcher II	Medium	To Do	To Do
673	Number of Longest Increasing Subsequence	Medium	Markdown	To Do
674	Longest Continuous Increasing Subsequence	Easy	Markdown	To Do
675	Cut Off Trees for Golf Event	Hard	To Do	To Do
676	Implement Magic Dictionary	Medium	To Do	To Do
677	Map Sum Pairs	Medium	To Do	To Do
678	Valid Parenthesis String	Medium	To Do	To Do
679	24 Game	Hard	To Do	To Do
680	Valid Palindrome II	Easy	Markdown	To Do
681	Next Closest Time 🔒	Medium	To Do	To Do
682	Baseball Game	Easy	To Do	To Do
683	K Empty Slots 🔒	Hard	To Do	To Do
684	Redundant Connection	Medium	To Do	To Do
685	Redundant Connection II	Hard	To Do	To Do
686	Repeated String Match	Medium	To Do	To Do
687	Longest Univalue Path	Easy	Markdown	To Do
688	Knight Probability in Chessboard	Medium	To Do	To Do
689	Maximum Sum of 3 Non-Overlapping Subarrays	Hard	To Do	To Do
690	Employee Importance	Easy	To Do	To Do
691	Stickers to Spell Word	Hard	To Do	To Do
692	Top K Frequent Words	Medium	To Do	To Do
693	Binary Number with Alternating Bits	Easy	To Do	To Do
694	Number of Distinct Islands 🔒	Medium	To Do	To Do
695	Max Area of Island	Medium	To Do	To Do
696	Count Binary Substrings	Easy	To Do	To Do
697	Degree of an Array	Easy	To Do	To Do
698	Partition to K Equal Sum Subsets	Medium	To Do	To Do
699	Falling Squares	Hard	To Do	To Do
711	Number of Distinct Islands II 🔒	Hard	To Do	To Do
712	Minimum ASCII Delete Sum for Two Strings	Medium	To Do	To Do
713	Subarray Product Less Than K	Medium	To Do	To Do
714	Best Time to Buy and Sell Stock with Transaction Fee	Medium	Markdown	To Do
715	Range Module	Hard	To Do	To Do
716	Max Stack 🔒	Easy	To Do	To Do
717	1-bit and 2-bit Characters	Easy	To Do	To Do
718	Maximum Length of Repeated Subarray	Medium	To Do	To Do
719	Find K-th Smallest Pair Distance	Hard	To Do	To Do
720	Longest Word in Dictionary	Easy	To Do	To Do
721	Accounts Merge	Medium	To Do	To Do
722	Remove Comments	Medium	To Do	To Do
723	Candy Crush 🔒	Medium	To Do	To Do
724	Find Pivot Index	Easy	To Do	To Do
725	Split Linked List in Parts	Medium	Markdown	To Do
726	Number of Atoms	Hard	To Do	To Do
727	Minimum Window Subsequence 🔒	Hard	To Do	To Do
728	Self Dividing Numbers	Easy	To Do	To Do
729	My Calendar I	Medium	To Do	To Do
730	Count Different Palindromic Subsequences	Hard	To Do	To Do
731	My Calendar II	Medium	To Do	To Do
732	My Calendar III	Hard	To Do	To Do
733	Flood Fill	Easy	To Do	To Do
734	Sentence Similarity 🔒	Easy	To Do	To Do
735	Asteroid Collision	Medium	To Do	To Do
736	Parse Lisp Expression	Hard	To Do	To Do
737	Sentence Similarity II 🔒	Medium	To Do	To Do
738	Monotone Increasing Digits	Medium	To Do	To Do
739	Daily Temperatures	Medium	Markdown	To Do
740	Delete and Earn	Medium	To Do	To Do
741	Cherry Pickup	Hard	To Do	To Do
709	To Lower Case	Easy	To Do	To Do
742	Closest Leaf in a Binary Tree 🔒	Medium	To Do	To Do
743	Network Delay Time	Medium	To Do	To Do
744	Find Smallest Letter Greater Than Target	Easy	Markdown	To Do
745	Prefix and Suffix Search	Hard	To Do	To Do
746	Min Cost Climbing Stairs	Easy	To Do	To Do
747	Largest Number At Least Twice of Others	Easy	To Do	To Do
748	Shortest Completing Word	Easy	To Do	To Do
749	Contain Virus	Hard	To Do	To Do
750	Number Of Corner Rectangles 🔒	Medium	To Do	To Do
751	IP to CIDR 🔒	Medium	To Do	To Do
752	Open the Lock	Medium	To Do	To Do
753	Cracking the Safe	Hard	To Do	To Do
754	Reach a Number	Medium	To Do	To Do
755	Pour Water 🔒	Medium	To Do	To Do
756	Pyramid Transition Matrix	Medium	To Do	To Do
426	Convert Binary Search Tree to Sorted Doubly Linked List 🔒	Medium	To Do	To Do
757	Set Intersection Size At Least Two	Hard	To Do	To Do
758	Bold Words in String 🔒	Easy	To Do	To Do
759	Employee Free Time 🔒	Hard	To Do	To Do
760	Find Anagram Mappings 🔒	Easy	To Do	To Do
761	Special Binary String	Hard	To Do	To Do
429	N-ary Tree Level Order Traversal	Medium	To Do	To Do
428	Serialize and Deserialize N-ary Tree 🔒	Hard	To Do	To Do
430	Flatten a Multilevel Doubly Linked List	Medium	To Do	To Do
762	Prime Number of Set Bits in Binary Representation	Easy	To Do	To Do
763	Partition Labels	Medium	To Do	To Do
764	Largest Plus Sign	Medium	To Do	To Do
765	Couples Holding Hands	Hard	To Do	To Do
431	Encode N-ary Tree to Binary Tree 🔒	Hard	To Do	To Do
427	Construct Quad Tree	Medium	To Do	To Do
558	Logical OR of Two Binary Grids Represented as Quad-Trees	Medium	To Do	To Do
559	Maximum Depth of N-ary Tree	Easy	To Do	To Do
589	N-ary Tree Preorder Traversal	Easy	To Do	To Do
590	N-ary Tree Postorder Traversal	Easy	To Do	To Do
766	Toeplitz Matrix	Easy	To Do	To Do
767	Reorganize String	Medium	To Do	To Do
768	Max Chunks To Make Sorted II	Hard	To Do	To Do
769	Max Chunks To Make Sorted	Medium	To Do	To Do
770	Basic Calculator IV	Hard	To Do	To Do
771	Jewels and Stones	Easy	To Do	To Do
700	Search in a Binary Search Tree	Easy	To Do	To Do
701	Insert into a Binary Search Tree	Medium	To Do	To Do
772	Basic Calculator III 🔒	Hard	To Do	To Do
702	Search in a Sorted Array of Unknown Size 🔒	Medium	To Do	To Do
773	Sliding Puzzle	Hard	To Do	To Do
774	Minimize Max Distance to Gas Station 🔒	Hard	To Do	To Do
703	Kth Largest Element in a Stream	Easy	To Do	To Do
775	Global and Local Inversions	Medium	To Do	To Do
776	Split BST 🔒	Medium	To Do	To Do
704	Binary Search	Easy	To Do	To Do
777	Swap Adjacent in LR String	Medium	To Do	To Do
778	Swim in Rising Water	Hard	To Do	To Do
779	K-th Symbol in Grammar	Medium	To Do	To Do
780	Reaching Points	Hard	To Do	To Do
781	Rabbits in Forest	Medium	To Do	To Do
782	Transform to Chessboard	Hard	To Do	To Do
783	Minimum Distance Between BST Nodes	Easy	Markdown	To Do
784	Letter Case Permutation	Medium	To Do	To Do
785	Is Graph Bipartite?	Medium	To Do	To Do
786	K-th Smallest Prime Fraction	Hard	To Do	To Do
787	Cheapest Flights Within K Stops	Medium	To Do	To Do
788	Rotated Digits	Easy	To Do	To Do
789	Escape The Ghosts	Medium	To Do	To Do
790	Domino and Tromino Tiling	Medium	To Do	To Do
791	Custom Sort String	Medium	To Do	To Do
792	Number of Matching Subsequences	Medium	To Do	To Do
793	Preimage Size of Factorial Zeroes Function	Hard	To Do	To Do
794	Valid Tic-Tac-Toe State	Medium	To Do	To Do
795	Number of Subarrays with Bounded Maximum	Medium	To Do	To Do
796	Rotate String	Easy	To Do	To Do
797	All Paths From Source to Target	Medium	To Do	To Do
798	Smallest Rotation with Highest Score	Hard	To Do	To Do
799	Champagne Tower	Medium	To Do	To Do
705	Design HashSet	Easy	To Do	To Do
706	Design HashMap	Easy	To Do	To Do
800	Similar RGB Color 🔒	Easy	To Do	To Do
801	Minimum Swaps To Make Sequences Increasing	Medium	To Do	To Do
802	Find Eventual Safe States	Medium	To Do	To Do
803	Bricks Falling When Hit	Hard	To Do	To Do
804	Unique Morse Code Words	Easy	To Do	To Do
805	Split Array With Same Average	Hard	To Do	To Do
806	Number of Lines To Write String	Easy	To Do	To Do
807	Max Increase to Keep City Skyline	Medium	To Do	To Do
808	Soup Servings	Medium	To Do	To Do
809	Expressive Words	Medium	To Do	To Do
810	Chalkboard XOR Game	Hard	To Do	To Do
811	Subdomain Visit Count	Easy	To Do	To Do
812	Largest Triangle Area	Easy	To Do	To Do
813	Largest Sum of Averages	Medium	To Do	To Do
814	Binary Tree Pruning	Medium	To Do	To Do
815	Bus Routes	Hard	To Do	To Do
816	Ambiguous Coordinates	Medium	To Do	To Do
817	Linked List Components	Medium	To Do	To Do
818	Race Car	Hard	To Do	To Do
819	Most Common Word	Easy	To Do	To Do
707	Design Linked List	Medium	To Do	To Do
820	Short Encoding of Words	Medium	To Do	To Do
821	Shortest Distance to a Character	Easy	To Do	To Do
822	Card Flipping Game	Medium	To Do	To Do
823	Binary Trees With Factors	Medium	To Do	To Do
708	Insert into a Sorted Circular Linked List 🔒	Medium	To Do	To Do
824	Goat Latin	Easy	To Do	To Do
825	Friends Of Appropriate Ages	Medium	To Do	To Do
826	Most Profit Assigning Work	Medium	To Do	To Do
827	Making A Large Island	Hard	To Do	To Do
828	Count Unique Characters of All Substrings of a Given String	Hard	To Do	To Do
829	Consecutive Numbers Sum	Hard	To Do	To Do
830	Positions of Large Groups	Easy	To Do	To Do
831	Masking Personal Information	Medium	To Do	To Do
641	Design Circular Deque	Medium	To Do	To Do
622	Design Circular Queue	Medium	To Do	To Do
832	Flipping an Image	Easy	To Do	To Do
833	Find And Replace in String	Medium	To Do	To Do
834	Sum of Distances in Tree	Hard	To Do	To Do
835	Image Overlap	Medium	To Do	To Do
489	Robot Room Cleaner 🔒	Hard	To Do	To Do
836	Rectangle Overlap	Easy	To Do	To Do
837	New 21 Game	Medium	To Do	To Do
838	Push Dominoes	Medium	To Do	To Do
839	Similar String Groups	Hard	To Do	To Do
840	Magic Squares In Grid	Medium	To Do	To Do
841	Keys and Rooms	Medium	To Do	To Do
842	Split Array into Fibonacci Sequence	Medium	To Do	To Do
843	Guess the Word	Hard	To Do	To Do
844	Backspace String Compare	Easy	To Do	To Do
845	Longest Mountain in Array	Medium	To Do	To Do
846	Hand of Straights	Medium	To Do	To Do
847	Shortest Path Visiting All Nodes	Hard	To Do	To Do
848	Shifting Letters	Medium	To Do	To Do
849	Maximize Distance to Closest Person	Medium	To Do	To Do
850	Rectangle Area II	Hard	To Do	To Do
851	Loud and Rich	Medium	To Do	To Do
852	Peak Index in a Mountain Array	Easy	To Do	To Do
853	Car Fleet	Medium	To Do	To Do
854	K-Similar Strings	Hard	To Do	To Do
855	Exam Room	Medium	To Do	To Do
856	Score of Parentheses	Medium	To Do	To Do
857	Minimum Cost to Hire K Workers	Hard	To Do	To Do
858	Mirror Reflection	Medium	To Do	To Do
859	Buddy Strings	Easy	To Do	To Do
860	Lemonade Change	Easy	To Do	To Do
861	Score After Flipping Matrix	Medium	To Do	To Do
862	Shortest Subarray with Sum at Least K	Hard	To Do	To Do
863	All Nodes Distance K in Binary Tree	Medium	To Do	To Do
710	Random Pick with Blacklist	Hard	To Do	To Do
864	Shortest Path to Get All Keys	Hard	To Do	To Do
865	Smallest Subtree with all the Deepest Nodes	Medium	To Do	To Do
866	Prime Palindrome	Medium	To Do	To Do
867	Transpose Matrix	Easy	To Do	To Do
868	Binary Gap	Easy	To Do	To Do
869	Reordered Power of 2	Medium	To Do	To Do
870	Advantage Shuffle	Medium	To Do	To Do
871	Minimum Number of Refueling Stops	Hard	To Do	To Do
470	Implement Rand10() Using Rand7()	Medium	To Do	To Do
872	Leaf-Similar Trees	Easy	To Do	To Do
873	Length of Longest Fibonacci Subsequence	Medium	To Do	To Do
874	Walking Robot Simulation	Easy	To Do	To Do
875	Koko Eating Bananas	Medium	To Do	To Do
876	Middle of the Linked List	Easy	To Do	To Do
877	Stone Game	Medium	To Do	To Do
878	Nth Magical Number	Hard	To Do	To Do
879	Profitable Schemes	Hard	To Do	To Do
528	Random Pick with Weight	Medium	To Do	To Do
519	Random Flip Matrix	Medium	To Do	To Do
497	Random Point in Non-overlapping Rectangles	Medium	To Do	To Do
478	Generate Random Point in a Circle	Medium	To Do	To Do
880	Decoded String at Index	Medium	To Do	To Do
881	Boats to Save People	Medium	To Do	To Do
882	Reachable Nodes In Subdivided Graph	Hard	To Do	To Do
883	Projection Area of 3D Shapes	Easy	To Do	To Do
884	Uncommon Words from Two Sentences	Easy	To Do	To Do
885	Spiral Matrix III	Medium	To Do	To Do
886	Possible Bipartition	Medium	To Do	To Do
887	Super Egg Drop	Hard	To Do	To Do
888	Fair Candy Swap	Easy	To Do	To Do
889	Construct Binary Tree from Preorder and Postorder Traversal	Medium	To Do	To Do
890	Find and Replace Pattern	Medium	To Do	To Do
891	Sum of Subsequence Widths	Hard	To Do	To Do
892	Surface Area of 3D Shapes	Easy	To Do	To Do
893	Groups of Special-Equivalent Strings	Easy	To Do	To Do
894	All Possible Full Binary Trees	Medium	To Do	To Do
895	Maximum Frequency Stack	Hard	To Do	To Do
896	Monotonic Array	Easy	To Do	To Do
897	Increasing Order Search Tree	Easy	To Do	To Do
898	Bitwise ORs of Subarrays	Medium	To Do	To Do
899	Orderly Queue	Hard	To Do	To Do
900	RLE Iterator	Medium	To Do	To Do
901	Online Stock Span	Medium	To Do	To Do
902	Numbers At Most N Given Digit Set	Hard	To Do	To Do
903	Valid Permutations for DI Sequence	Hard	To Do	To Do
904	Fruit Into Baskets	Medium	To Do	To Do
905	Sort Array By Parity	Easy	To Do	To Do
906	Super Palindromes	Hard	To Do	To Do
907	Sum of Subarray Minimums	Medium	To Do	To Do
908	Smallest Range I	Easy	To Do	To Do
909	Snakes and Ladders	Medium	To Do	To Do
910	Smallest Range II	Medium	To Do	To Do
911	Online Election	Medium	To Do	To Do
912	Sort an Array	Medium	To Do	To Do
913	Cat and Mouse	Hard	To Do	To Do
914	X of a Kind in a Deck of Cards	Easy	To Do	To Do
915	Partition Array into Disjoint Intervals	Medium	To Do	To Do
916	Word Subsets	Medium	To Do	To Do
917	Reverse Only Letters	Easy	To Do	To Do
918	Maximum Sum Circular Subarray	Medium	To Do	To Do
919	Complete Binary Tree Inserter	Medium	To Do	To Do
920	Number of Music Playlists	Hard	To Do	To Do
921	Minimum Add to Make Parentheses Valid	Medium	To Do	To Do
922	Sort Array By Parity II	Easy	To Do	To Do
923	3Sum With Multiplicity	Medium	To Do	To Do
924	Minimize Malware Spread	Hard	To Do	To Do
925	Long Pressed Name	Easy	To Do	To Do
926	Flip String to Monotone Increasing	Medium	To Do	To Do
927	Three Equal Parts	Hard	To Do	To Do
928	Minimize Malware Spread II	Hard	To Do	To Do
929	Unique Email Addresses	Easy	To Do	To Do
930	Binary Subarrays With Sum	Medium	To Do	To Do
931	Minimum Falling Path Sum	Medium	To Do	To Do
932	Beautiful Array	Medium	To Do	To Do
933	Number of Recent Calls	Easy	To Do	To Do
934	Shortest Bridge	Medium	To Do	To Do
935	Knight Dialer	Medium	To Do	To Do
936	Stamping The Sequence	Hard	To Do	To Do
937	Reorder Data in Log Files	Easy	To Do	To Do
938	Range Sum of BST	Easy	To Do	To Do
939	Minimum Area Rectangle	Medium	To Do	To Do
940	Distinct Subsequences II	Hard	To Do	To Do
941	Valid Mountain Array	Easy	To Do	To Do
942	DI String Match	Easy	To Do	To Do
943	Find the Shortest Superstring	Hard	To Do	To Do
944	Delete Columns to Make Sorted	Easy	To Do	To Do
945	Minimum Increment to Make Array Unique	Medium	To Do	To Do
946	Validate Stack Sequences	Medium	To Do	To Do
947	Most Stones Removed with Same Row or Column	Medium	To Do	To Do
948	Bag of Tokens	Medium	To Do	To Do
949	Largest Time for Given Digits	Medium	To Do	To Do
950	Reveal Cards In Increasing Order	Medium	To Do	To Do
951	Flip Equivalent Binary Trees	Medium	To Do	To Do
952	Largest Component Size by Common Factor	Hard	To Do	To Do
953	Verifying an Alien Dictionary	Easy	To Do	To Do
954	Array of Doubled Pairs	Medium	To Do	To Do
955	Delete Columns to Make Sorted II	Medium	To Do	To Do
956	Tallest Billboard	Hard	To Do	To Do
957	Prison Cells After N Days	Medium	To Do	To Do
958	Check Completeness of a Binary Tree	Medium	To Do	To Do
959	Regions Cut By Slashes	Medium	To Do	To Do
960	Delete Columns to Make Sorted III	Hard	To Do	To Do
961	N-Repeated Element in Size 2N Array	Easy	To Do	To Do
962	Maximum Width Ramp	Medium	To Do	To Do
963	Minimum Area Rectangle II	Medium	To Do	To Do
964	Least Operators to Express Number	Hard	To Do	To Do
965	Univalued Binary Tree	Easy	To Do	To Do
966	Vowel Spellchecker	Medium	To Do	To Do
967	Numbers With Same Consecutive Differences	Medium	To Do	To Do
968	Binary Tree Cameras	Hard	To Do	To Do
969	Pancake Sorting	Medium	To Do	To Do
970	Powerful Integers	Easy	To Do	To Do
971	Flip Binary Tree To Match Preorder Traversal	Medium	To Do	To Do
972	Equal Rational Numbers	Hard	To Do	To Do
509	Fibonacci Number	Easy	To Do	To Do
973	K Closest Points to Origin	Medium	To Do	To Do
974	Subarray Sums Divisible by K	Medium	To Do	To Do
975	Odd Even Jump	Hard	To Do	To Do
976	Largest Perimeter Triangle	Easy	To Do	To Do
977	Squares of a Sorted Array	Easy	To Do	To Do
978	Longest Turbulent Subarray	Medium	To Do	To Do
979	Distribute Coins in Binary Tree	Medium	To Do	To Do
980	Unique Paths III	Hard	To Do	To Do
981	Time Based Key-Value Store	Medium	To Do	To Do
982	Triples with Bitwise AND Equal To Zero	Hard	To Do	To Do
983	Minimum Cost For Tickets	Medium	To Do	To Do
984	String Without AAA or BBB	Medium	To Do	To Do
985	Sum of Even Numbers After Queries	Easy	To Do	To Do
986	Interval List Intersections	Medium	To Do	To Do
987	Vertical Order Traversal of a Binary Tree	Medium	To Do	To Do
988	Smallest String Starting From Leaf	Medium	To Do	To Do
989	Add to Array-Form of Integer	Easy	To Do	To Do
990	Satisfiability of Equality Equations	Medium	To Do	To Do
991	Broken Calculator	Medium	To Do	To Do
992	Subarrays with K Different Integers	Hard	To Do	To Do
993	Cousins in Binary Tree	Easy	To Do	To Do
994	Rotting Oranges	Medium	To Do	To Do
995	Minimum Number of K Consecutive Bit Flips	Hard	To Do	To Do
996	Number of Squareful Arrays	Hard	To Do	To Do
997	Find the Town Judge	Easy	To Do	To Do
998	Maximum Binary Tree II	Medium	To Do	To Do
999	Available Captures for Rook	Easy	To Do	To Do
1000	Minimum Cost to Merge Stones	Hard	To Do	To Do
1001	Grid Illumination	Hard	To Do	To Do
1002	Find Common Characters	Easy	To Do	To Do
1003	Check If Word Is Valid After Substitutions	Medium	To Do	To Do
1004	Max Consecutive Ones III	Medium	To Do	To Do
1005	Maximize Sum Of Array After K Negations	Easy	To Do	To Do
1006	Clumsy Factorial	Medium	To Do	To Do
1007	Minimum Domino Rotations For Equal Row	Medium	To Do	To Do
1008	Construct Binary Search Tree from Preorder Traversal	Medium	To Do	To Do
1055	Shortest Way to Form String 🔒	Medium	To Do	To Do
1057	Campus Bikes 🔒	Medium	To Do	To Do
1058	Minimize Rounding Error to Meet Target 🔒	Medium	To Do	To Do
1009	Complement of Base 10 Integer	Easy	To Do	To Do
1010	Pairs of Songs With Total Durations Divisible by 60	Easy	To Do	To Do
1011	Capacity To Ship Packages Within D Days	Medium	To Do	To Do
1012	Numbers With Repeated Digits	Hard	To Do	To Do
1061	Lexicographically Smallest Equivalent String 🔒	Medium	To Do	To Do
1060	Missing Element in Sorted Array 🔒	Medium	To Do	To Do
1062	Longest Repeating Substring 🔒	Medium	To Do	To Do
1063	Number of Valid Subarrays 🔒	Hard	To Do	To Do
1013	Partition Array Into Three Parts With Equal Sum	Easy	To Do	To Do
1014	Best Sightseeing Pair	Medium	To Do	To Do
1015	Smallest Integer Divisible by K	Medium	To Do	To Do
1016	Binary String With Substrings Representing 1 To N	Medium	To Do	To Do
1064	Fixed Point 🔒	Easy	To Do	To Do
1066	Campus Bikes II 🔒	Medium	To Do	To Do
1067	Digit Count in Range 🔒	Hard	To Do	To Do
1056	Confusing Number 🔒	Easy	To Do	To Do
1017	Convert to Base -2	Medium	To Do	To Do
1018	Binary Prefix Divisible By 5	Easy	To Do	To Do
1019	Next Greater Node In Linked List	Medium	To Do	To Do
1020	Number of Enclaves	Medium	To Do	To Do
1086	High Five 🔒	Easy	To Do	To Do
1065	Index Pairs of a String 🔒	Easy	To Do	To Do
1087	Brace Expansion 🔒	Medium	To Do	To Do
1088	Confusing Number II 🔒	Hard	To Do	To Do
1021	Remove Outermost Parentheses	Easy	To Do	To Do
1022	Sum of Root To Leaf Binary Numbers	Easy	To Do	To Do
1023	Camelcase Matching	Medium	To Do	To Do
1024	Video Stitching	Medium	To Do	To Do
1085	Sum of Digits in the Minimum Number 🔒	Easy	To Do	To Do
1099	Two Sum Less Than K 🔒	Easy	To Do	To Do
1100	Find K-Length Substrings With No Repeated Characters 🔒	Medium	To Do	To Do
1101	The Earliest Moment When Everyone Become Friends 🔒	Medium	To Do	To Do
1025	Divisor Game	Easy	To Do	To Do
1027	Longest Arithmetic Subsequence	Medium	To Do	To Do
1118	Number of Days in a Month 🔒	Easy	To Do	To Do
1119	Remove Vowels from a String 🔒	Easy	To Do	To Do
1134	Armstrong Number 🔒	Easy	To Do	To Do
1120	Maximum Average Subtree 🔒	Medium	To Do	To Do
1026	Maximum Difference Between Node and Ancestor	Medium	To Do	To Do
1028	Recover a Tree From Preorder Traversal	Hard	To Do	To Do
1030	Matrix Cells in Distance Order	Easy	To Do	To Do
1029	Two City Scheduling	Medium	To Do	To Do
1031	Maximum Sum of Two Non-Overlapping Subarrays	Medium	To Do	To Do
1032	Stream of Characters	Hard	To Do	To Do
1133	Largest Unique Number 🔒	Easy	To Do	To Do
1102	Path With Maximum Minimum Value 🔒	Medium	To Do	To Do
1135	Connecting Cities With Minimum Cost 🔒	Medium	To Do	To Do
1136	Parallel Courses 🔒	Hard	To Do	To Do
1150	Check If a Number Is Majority Element in a Sorted Array 🔒	Easy	To Do	To Do
1033	Moving Stones Until Consecutive	Easy	To Do	To Do
1034	Coloring A Border	Medium	To Do	To Do
1035	Uncrossed Lines	Medium	To Do	To Do
1036	Escape a Large Maze	Hard	To Do	To Do
1151	Minimum Swaps to Group All 1's Together 🔒	Medium	To Do	To Do
1152	Analyze User Website Visit Pattern 🔒	Medium	To Do	To Do
1039	Minimum Score Triangulation of Polygon	Medium	To Do	To Do
1160	Find Words That Can Be Formed by Characters	Easy	To Do	To Do
1040	Moving Stones Until Consecutive II	Medium	To Do	To Do
1038	Binary Search Tree to Greater Sum Tree	Medium	To Do	To Do
1037	Valid Boomerang	Easy	To Do	To Do
1161	Maximum Level Sum of a Binary Tree	Medium	To Do	To Do
1162	As Far from Land as Possible	Medium	To Do	To Do
1121	Divide Array Into Increasing Sequences 🔒	Hard	To Do	To Do
1041	Robot Bounded In Circle	Medium	To Do	To Do
1042	Flower Planting With No Adjacent	Easy	To Do	To Do
1043	Partition Array for Maximum Sum	Medium	To Do	To Do
1044	Longest Duplicate Substring	Hard	To Do	To Do
1165	Single-Row Keyboard 🔒	Easy	To Do	To Do
1153	String Transforms Into Another String 🔒	Hard	To Do	To Do
1166	Design File System 🔒	Medium	To Do	To Do
1167	Minimum Cost to Connect Sticks 🔒	Medium	To Do	To Do
1046	Last Stone Weight	Easy	To Do	To Do
1047	Remove All Adjacent Duplicates In String	Easy	To Do	To Do
1048	Longest String Chain	Medium	To Do	To Do
1049	Last Stone Weight II	Medium	To Do	To Do
1180	Count Substrings with Only One Distinct Letter 🔒	Easy	To Do	To Do
1181	Before and After Puzzle 🔒	Medium	To Do	To Do
1163	Last Substring in Lexicographical Order	Hard	To Do	To Do
1182	Shortest Distance to Target Color 🔒	Medium	To Do	To Do
1051	Height Checker	Easy	To Do	To Do
1052	Grumpy Bookstore Owner	Medium	To Do	To Do
1053	Previous Permutation With One Swap	Medium	To Do	To Do
1054	Distant Barcodes	Medium	To Do	To Do
1196	How Many Apples Can You Put into the Basket 🔒	Easy	To Do	To Do
1197	Minimum Knight Moves 🔒	Medium	To Do	To Do
1198	Find Smallest Common Element in All Rows 🔒	Medium	To Do	To Do
1168	Optimize Water Distribution in a Village 🔒	Hard	To Do	To Do
1074	Number of Submatrices That Sum to Target	Hard	To Do	To Do
1071	Greatest Common Divisor of Strings	Easy	To Do	To Do
1072	Flip Columns For Maximum Number of Equal Rows	Medium	To Do	To Do
1073	Adding Two Negabinary Numbers	Medium	To Do	To Do
1213	Intersection of Three Sorted Arrays 🔒	Easy	To Do	To Do
1214	Two Sum BSTs 🔒	Medium	To Do	To Do
1215	Stepping Numbers 🔒	Medium	To Do	To Do
1183	Maximum Number of Ones 🔒	Hard	To Do	To Do
1078	Occurrences After Bigram	Easy	To Do	To Do
1080	Insufficient Nodes in Root to Leaf Paths	Medium	To Do	To Do
1081	Smallest Subsequence of Distinct Characters	Medium	To Do	To Do
1079	Letter Tile Possibilities	Medium	To Do	To Do
1228	Missing Number In Arithmetic Progression 🔒	Easy	To Do	To Do
1229	Meeting Scheduler 🔒	Medium	To Do	To Do
1230	Toss Strange Coins 🔒	Medium	To Do	To Do
1199	Minimum Time to Build Blocks 🔒	Hard	To Do	To Do
1089	Duplicate Zeros	Easy	To Do	To Do
1090	Largest Values From Labels	Medium	To Do	To Do
1092	Shortest Common Supersequence	Hard	To Do	To Do
1091	Shortest Path in Binary Matrix	Medium	To Do	To Do
1243	Array Transformation 🔒	Easy	To Do	To Do
1244	Design A Leaderboard 🔒	Medium	To Do	To Do
1245	Tree Diameter 🔒	Medium	To Do	To Do
1216	Valid Palindrome III 🔒	Hard	To Do	To Do
1093	Statistics from a Large Sample	Medium	To Do	To Do
1094	Car Pooling	Medium	To Do	To Do
1095	Find in Mountain Array	Hard	To Do	To Do
1096	Brace Expansion II	Hard	To Do	To Do
1256	Encode Number 🔒	Medium	To Do	To Do
1257	Smallest Common Region 🔒	Medium	To Do	To Do
1258	Synonymous Sentences 🔒	Medium	To Do	To Do
1231	Divide Chocolate 🔒	Hard	To Do	To Do
1104	Path In Zigzag Labelled Binary Tree	Medium	To Do	To Do
1103	Distribute Candies to People	Easy	To Do	To Do
1105	Filling Bookcase Shelves	Medium	To Do	To Do
1106	Parsing A Boolean Expression	Hard	To Do	To Do
1271	Hexspeak 🔒	Easy	To Do	To Do
1272	Remove Interval 🔒	Medium	To Do	To Do
1273	Delete Tree Nodes 🔒	Medium	To Do	To Do
1246	Palindrome Removal 🔒	Hard	To Do	To Do
1108	Defanging an IP Address	Easy	To Do	To Do
1109	Corporate Flight Bookings	Medium	To Do	To Do
1110	Delete Nodes And Return Forest	Medium	To Do	To Do
1111	Maximum Nesting Depth of Two Valid Parentheses Strings	Medium	To Do	To Do
1286	Iterator for Combination	Medium	To Do	To Do
1291	Sequential Digits	Medium	To Do	To Do
1259	Handshakes That Don't Cross 🔒	Hard	To Do	To Do
1122	Relative Sort Array	Easy	To Do	To Do
1123	Lowest Common Ancestor of Deepest Leaves	Medium	To Do	To Do
1124	Longest Well-Performing Interval	Medium	To Do	To Do
1125	Smallest Sufficient Team	Hard	To Do	To Do
1287	Element Appearing More Than 25% In Sorted Array	Easy	To Do	To Do
1288	Remove Covered Intervals	Medium	To Do	To Do
1289	Minimum Falling Path Sum II	Hard	To Do	To Do
1128	Number of Equivalent Domino Pairs	Easy	To Do	To Do
1130	Minimum Cost Tree From Leaf Values	Medium	To Do	To Do
1129	Shortest Path with Alternating Colors	Medium	To Do	To Do
1131	Maximum of Absolute Value Expression	Medium	To Do	To Do
1299	Replace Elements with Greatest Element on Right Side	Easy	To Do	To Do
1300	Sum of Mutated Array Closest to Target	Medium	To Do	To Do
1274	Number of Ships in a Rectangle 🔒	Hard	To Do	To Do
1301	Number of Paths with Max Score	Hard	To Do	To Do
1137	N-th Tribonacci Number	Easy	To Do	To Do
1138	Alphabet Board Path	Medium	To Do	To Do
1139	Largest 1-Bordered Square	Medium	To Do	To Do
1140	Stone Game II	Medium	To Do	To Do
1313	Decompress Run-Length Encoded List	Easy	To Do	To Do
1314	Matrix Block Sum	Medium	To Do	To Do
1315	Sum of Nodes with Even-Valued Grandparent	Medium	To Do	To Do
1316	Distinct Echo Substrings	Hard	To Do	To Do
1144	Decrease Elements To Make Array Zigzag	Medium	To Do	To Do
1145	Binary Tree Coloring Game	Medium	To Do	To Do
1146	Snapshot Array	Medium	To Do	To Do
1143	Longest Common Subsequence	Medium	To Do	To Do
1147	Longest Chunked Palindrome Decomposition	Hard	To Do	To Do
1328	Break a Palindrome	Medium	To Do	To Do
1329	Sort the Matrix Diagonally	Medium	To Do	To Do
1302	Deepest Leaves Sum	Medium	To Do	To Do
1330	Reverse Subarray To Maximize Array Value	Hard	To Do	To Do
1331	Rank Transform of an Array	Easy	To Do	To Do
1154	Day of the Year	Easy	To Do	To Do
1156	Swap For Longest Repeated Character Substring	Medium	To Do	To Do
1157	Online Majority Element In Subarray	Hard	To Do	To Do
1155	Number of Dice Rolls With Target Sum	Medium	To Do	To Do
1171	Remove Zero Sum Consecutive Nodes from Linked List	Medium	To Do	To Do
1172	Dinner Plate Stacks	Hard	To Do	To Do
1236	Web Crawler 🔒	Medium	To Do	To Do
1169	Invalid Transactions	Medium	To Do	To Do
1170	Compare Strings by Frequency of the Smallest Character	Easy	To Do	To Do
1360	Number of Days Between Two Dates	Easy	To Do	To Do
1361	Validate Binary Tree Nodes	Medium	To Do	To Do
1362	Closest Divisors	Medium	To Do	To Do
1363	Largest Multiple of Three	Hard	To Do	To Do
1175	Prime Arrangements	Easy	To Do	To Do
1176	Diet Plan Performance 🔒	Easy	To Do	To Do
1177	Can Make Palindrome from Substring	Medium	To Do	To Do
1178	Number of Valid Words for Each Puzzle	Hard	To Do	To Do
1507	Reformat Date	Easy	To Do	To Do
1390	Four Divisors	Medium	To Do	To Do
1382	Balance a Binary Search Tree	Medium	To Do	To Do
1425	Constrained Subsequence Sum	Hard	To Do	To Do
1184	Distance Between Bus Stops	Easy	To Do	To Do
1186	Maximum Subarray Sum with One Deletion	Medium	To Do	To Do
1185	Day of the Week	Easy	To Do	To Do
1187	Make Array Strictly Increasing	Hard	To Do	To Do
1550	Three Consecutive Odds	Easy	To Do	To Do
1483	Kth Ancestor of a Tree Node	Hard	To Do	To Do
1189	Maximum Number of Balloons	Easy	To Do	To Do
1190	Reverse Substrings Between Each Pair of Parentheses	Medium	To Do	To Do
1191	K-Concatenation Maximum Sum	Medium	To Do	To Do
1192	Critical Connections in a Network	Hard	To Do	To Do
1405	Longest Happy String	Medium	To Do	To Do
1200	Minimum Absolute Difference	Easy	To Do	To Do
1201	Ugly Number III	Medium	To Do	To Do
1202	Smallest String With Swaps	Medium	To Do	To Do
1203	Sort Items by Groups Respecting Dependencies	Hard	To Do	To Do
1207	Unique Number of Occurrences	Easy	To Do	To Do
1209	Remove All Adjacent Duplicates in String II	Medium	To Do	To Do
1208	Get Equal Substrings Within Budget	Medium	To Do	To Do
1210	Minimum Moves to Reach Target with Rotations	Hard	To Do	To Do
1514	Path with Maximum Probability	Medium	To Do	To Do
1217	Minimum Cost to Move Chips to The Same Position	Easy	To Do	To Do
1218	Longest Arithmetic Subsequence of Given Difference	Medium	To Do	To Do
1219	Path with Maximum Gold	Medium	To Do	To Do
1220	Count Vowels Permutation	Hard	To Do	To Do
1206	Design Skiplist	Hard	To Do	To Do
1221	Split a String in Balanced Strings	Easy	To Do	To Do
1222	Queens That Can Attack the King	Medium	To Do	To Do
1223	Dice Roll Simulation	Medium	To Do	To Do
1224	Maximum Equal Frequency	Hard	To Do	To Do
1427	Perform String Shifts 🔒	Easy	To Do	To Do
1232	Check If It Is a Straight Line	Easy	To Do	To Do
1233	Remove Sub-Folders from the Filesystem	Medium	To Do	To Do
1234	Replace the Substring for Balanced String	Medium	To Do	To Do
1235	Maximum Profit in Job Scheduling	Hard	To Do	To Do
1237	Find Positive Integer Solution for a Given Equation	Easy	To Do	To Do
1238	Circular Permutation in Binary Representation	Medium	To Do	To Do
1239	Maximum Length of a Concatenated String with Unique Characters	Medium	To Do	To Do
1240	Tiling a Rectangle with the Fewest Squares	Hard	To Do	To Do
1227	Airplane Seat Assignment Probability	Medium	To Do	To Do
1429	First Unique Number 🔒	Medium	To Do	To Do
1247	Minimum Swaps to Make Strings Equal	Medium	To Do	To Do
1248	Count Number of Nice Subarrays	Medium	To Do	To Do
1249	Minimum Remove to Make Valid Parentheses	Medium	To Do	To Do
1250	Check If It Is a Good Array	Hard	To Do	To Do
1428	Leftmost Column with at Least a One 🔒	Medium	To Do	To Do
1252	Cells with Odd Values in a Matrix	Easy	To Do	To Do
1253	Reconstruct a 2-Row Binary Matrix	Medium	To Do	To Do
1254	Number of Closed Islands	Medium	To Do	To Do
1255	Maximum Score Words Formed by Letters	Hard	To Do	To Do
1260	Shift 2D Grid	Easy	To Do	To Do
1261	Find Elements in a Contaminated Binary Tree	Medium	To Do	To Do
1262	Greatest Sum Divisible by Three	Medium	To Do	To Do
1263	Minimum Moves to Move a Box to Their Target Location	Hard	To Do	To Do
1426	Counting Elements 🔒	Easy	To Do	To Do
1266	Minimum Time Visiting All Points	Easy	To Do	To Do
1267	Count Servers that Communicate	Medium	To Do	To Do
1268	Search Suggestions System	Medium	To Do	To Do
1269	Number of Ways to Stay in the Same Place After Some Steps	Hard	To Do	To Do
1275	Find Winner on a Tic Tac Toe Game	Easy	To Do	To Do
1276	Number of Burgers with No Waste of Ingredients	Medium	To Do	To Do
1277	Count Square Submatrices with All Ones	Medium	To Do	To Do
1278	Palindrome Partitioning III	Hard	To Do	To Do
1265	Print Immutable Linked List in Reverse 🔒	Medium	To Do	To Do
1281	Subtract the Product and Sum of Digits of an Integer	Easy	To Do	To Do
1282	Group the People Given the Group Size They Belong To	Medium	To Do	To Do
1283	Find the Smallest Divisor Given a Threshold	Medium	To Do	To Do
1284	Minimum Number of Flips to Convert Binary Matrix to Zero Matrix	Hard	To Do	To Do
1290	Convert Binary Number in a Linked List to Integer	Easy	To Do	To Do
1292	Maximum Side Length of a Square with Sum Less than or Equal to Threshold	Medium	To Do	To Do
1293	Shortest Path in a Grid with Obstacles Elimination	Hard	To Do	To Do
1295	Find Numbers with Even Number of Digits	Easy	To Do	To Do
1296	Divide Array in Sets of K Consecutive Numbers	Medium	To Do	To Do
1297	Maximum Number of Occurrences of a Substring	Medium	To Do	To Do
1298	Maximum Candies You Can Get from Boxes	Hard	To Do	To Do
1304	Find N Unique Integers Sum up to Zero	Easy	To Do	To Do
1305	All Elements in Two Binary Search Trees	Medium	To Do	To Do
1306	Jump Game III	Medium	To Do	To Do
1307	Verbal Arithmetic Puzzle	Hard	To Do	To Do
1430	Check If a String Is a Valid Sequence from Root to Leaves Path in a Binary Tree 🔒	Medium	To Do	To Do
1309	Decrypt String from Alphabet to Integer Mapping	Easy	To Do	To Do
1310	XOR Queries of a Subarray	Medium	To Do	To Do
1311	Get Watched Videos by Your Friends	Medium	To Do	To Do
1312	Minimum Insertion Steps to Make a String Palindrome	Hard	To Do	To Do
1317	Convert Integer to the Sum of Two No-Zero Integers	Easy	To Do	To Do
1318	Minimum Flips to Make a OR b Equal to c	Medium	To Do	To Do
1319	Number of Operations to Make Network Connected	Medium	To Do	To Do
1320	Minimum Distance to Type a Word Using Two Fingers	Hard	To Do	To Do
1342	Number of Steps to Reduce a Number to Zero	Easy	To Do	To Do
1343	Number of Sub-arrays of Size K and Average Greater than or Equal to Threshold	Medium	To Do	To Do
1344	Angle Between Hands of a Clock	Medium	To Do	To Do
1345	Jump Game IV	Hard	To Do	To Do
1323	Maximum 69 Number	Easy	To Do	To Do
1324	Print Words Vertically	Medium	To Do	To Do
1325	Delete Leaves With a Given Value	Medium	To Do	To Do
1326	Minimum Number of Taps to Open to Water a Garden	Hard	To Do	To Do
1332	Remove Palindromic Subsequences	Easy	To Do	To Do
1333	Filter Restaurants by Vegan-Friendly, Price and Distance	Medium	To Do	To Do
1334	Find the City With the Smallest Number of Neighbors at a Threshold Distance	Medium	To Do	To Do
1335	Minimum Difficulty of a Job Schedule	Hard	To Do	To Do
1356	Sort Integers by The Number of 1 Bits	Easy	To Do	To Do
1357	Apply Discount Every n Orders	Medium	To Do	To Do
1358	Number of Substrings Containing All Three Characters	Medium	To Do	To Do
1359	Count All Valid Pickup and Delivery Options	Hard	To Do	To Do
1337	The K Weakest Rows in a Matrix	Easy	To Do	To Do
1338	Reduce Array Size to The Half	Medium	To Do	To Do
1339	Maximum Product of Splitted Binary Tree	Medium	To Do	To Do
1340	Jump Game V	Hard	To Do	To Do
1346	Check If N and Its Double Exist	Easy	To Do	To Do
1347	Minimum Number of Steps to Make Two Strings Anagram	Medium	To Do	To Do
1348	Tweet Counts Per Frequency	Medium	To Do	To Do
1349	Maximum Students Taking Exam	Hard	To Do	To Do
1370	Increasing Decreasing String	Easy	To Do	To Do
1371	Find the Longest Substring Containing Vowels in Even Counts	Medium	To Do	To Do
1372	Longest ZigZag Path in a Binary Tree	Medium	To Do	To Do
1373	Maximum Sum BST in Binary Tree	Hard	To Do	To Do
1351	Count Negative Numbers in a Sorted Matrix	Easy	To Do	To Do
1352	Product of the Last K Numbers	Medium	To Do	To Do
1353	Maximum Number of Events That Can Be Attended	Medium	To Do	To Do
1354	Construct Target Array With Multiple Sums	Hard	To Do	To Do
1365	How Many Numbers Are Smaller Than the Current Number	Easy	To Do	To Do
1366	Rank Teams by Votes	Medium	To Do	To Do
1367	Linked List in Binary Tree	Medium	To Do	To Do
1368	Minimum Cost to Make at Least One Valid Path in a Grid	Hard	To Do	To Do
1385	Find the Distance Value Between Two Arrays	Easy	To Do	To Do
1386	Cinema Seat Allocation	Medium	To Do	To Do
1387	Sort Integers by The Power Value	Medium	To Do	To Do
1388	Pizza With 3n Slices	Hard	To Do	To Do
1374	Generate a String With Characters That Have Odd Counts	Easy	To Do	To Do
1375	Bulb Switcher III	Medium	To Do	To Do
1376	Time Needed to Inform All Employees	Medium	To Do	To Do
1377	Frog Position After T Seconds	Hard	To Do	To Do
1380	Lucky Numbers in a Matrix	Easy	To Do	To Do
1381	Design a Stack With Increment Operation	Medium	To Do	To Do
1379	Find a Corresponding Node of a Binary Tree in a Clone of That Tree	Medium	To Do	To Do
1383	Maximum Performance of a Team	Hard	To Do	To Do
1399	Count Largest Group	Easy	To Do	To Do
1401	Circle and Rectangle Overlapping	Medium	To Do	To Do
1400	Construct K Palindrome Strings	Medium	To Do	To Do
1402	Reducing Dishes	Hard	To Do	To Do
1389	Create Target Array in the Given Order	Easy	To Do	To Do
1391	Check if There is a Valid Path in a Grid	Medium	To Do	To Do
1392	Longest Happy Prefix	Hard	To Do	To Do
1394	Find Lucky Integer in an Array	Easy	To Do	To Do
1395	Count Number of Teams	Medium	To Do	To Do
1396	Design Underground System	Medium	To Do	To Do
1397	Find All Good Strings	Hard	To Do	To Do
1413	Minimum Value to Get Positive Step by Step Sum	Easy	To Do	To Do
1414	Find the Minimum Number of Fibonacci Numbers Whose Sum Is K	Medium	To Do	To Do
1415	The k-th Lexicographical String of All Happy Strings of Length n	Medium	To Do	To Do
1416	Restore The Array	Hard	To Do	To Do
1403	Minimum Subsequence in Non-Increasing Order	Easy	To Do	To Do
1404	Number of Steps to Reduce a Number in Binary Representation to One	Medium	To Do	To Do
1406	Stone Game III	Hard	To Do	To Do
1408	String Matching in an Array	Easy	To Do	To Do
1409	Queries on a Permutation With Key	Medium	To Do	To Do
1410	HTML Entity Parser	Medium	To Do	To Do
1411	Number of Ways to Paint N × 3 Grid	Hard	To Do	To Do
1431	Kids With the Greatest Number of Candies	Easy	To Do	To Do
1432	Max Difference You Can Get From Changing an Integer	Medium	To Do	To Do
1433	Check If a String Can Break Another String	Medium	To Do	To Do
1434	Number of Ways to Wear Different Hats to Each Other	Hard	To Do	To Do
1417	Reformat The String	Easy	To Do	To Do
1418	Display Table of Food Orders in a Restaurant	Medium	To Do	To Do
1419	Minimum Number of Frogs Croaking	Medium	To Do	To Do
1420	Build Array Where You Can Find The Maximum Exactly K Comparisons	Hard	To Do	To Do
1422	Maximum Score After Splitting a String	Easy	To Do	To Do
1423	Maximum Points You Can Obtain from Cards	Medium	To Do	To Do
1424	Diagonal Traverse II	Medium	To Do	To Do
1446	Consecutive Characters	Easy	To Do	To Do
1447	Simplified Fractions	Medium	To Do	To Do
1448	Count Good Nodes in Binary Tree	Medium	To Do	To Do
1449	Form Largest Integer With Digits That Add up to Target	Hard	To Do	To Do
1436	Destination City	Easy	To Do	To Do
1437	Check If All 1's Are at Least Length K Places Away	Medium	To Do	To Do
1438	Longest Continuous Subarray With Absolute Diff Less Than or Equal to Limit	Medium	To Do	To Do
1439	Find the Kth Smallest Sum of a Matrix With Sorted Rows	Hard	To Do	To Do
1441	Build an Array With Stack Operations	Easy	To Do	To Do
1442	Count Triplets That Can Form Two Arrays of Equal XOR	Medium	To Do	To Do
1443	Minimum Time to Collect All Apples in a Tree	Medium	To Do	To Do
1444	Number of Ways of Cutting a Pizza	Hard	To Do	To Do
1460	Make Two Arrays Equal by Reversing Sub-arrays	Easy	To Do	To Do
1461	Check If a String Contains All Binary Codes of Size K	Medium	To Do	To Do
1462	Course Schedule IV	Medium	To Do	To Do
1463	Cherry Pickup II	Hard	To Do	To Do
1450	Number of Students Doing Homework at a Given Time	Easy	To Do	To Do
1451	Rearrange Words in a Sentence	Medium	To Do	To Do
1452	People Whose List of Favorite Companies Is Not a Subset of Another List	Medium	To Do	To Do
1453	Maximum Number of Darts Inside of a Circular Dartboard	Hard	To Do	To Do
1455	Check If a Word Occurs As a Prefix of Any Word in a Sentence	Easy	To Do	To Do
1456	Maximum Number of Vowels in a Substring of Given Length	Medium	To Do	To Do
1457	Pseudo-Palindromic Paths in a Binary Tree	Medium	To Do	To Do
1458	Max Dot Product of Two Subsequences	Hard	To Do	To Do
1475	Final Prices With a Special Discount in a Shop	Easy	To Do	To Do
1478	Allocate Mailboxes	Hard	To Do	To Do
1476	Subrectangle Queries	Medium	To Do	To Do
1477	Find Two Non-overlapping Sub-arrays Each With Target Sum	Medium	To Do	To Do
1464	Maximum Product of Two Elements in an Array	Easy	To Do	To Do
1465	Maximum Area of a Piece of Cake After Horizontal and Vertical Cuts	Medium	To Do	To Do
1466	Reorder Routes to Make All Paths Lead to the City Zero	Medium	To Do	To Do
1467	Probability of a Two Boxes Having The Same Number of Distinct Balls	Hard	To Do	To Do
1470	Shuffle the Array	Easy	To Do	To Do
1471	The k Strongest Values in an Array	Medium	To Do	To Do
1472	Design Browser History	Medium	To Do	To Do
1473	Paint House III	Hard	To Do	To Do
1491	Average Salary Excluding the Minimum and Maximum Salary	Easy	To Do	To Do
1492	The kth Factor of n	Medium	To Do	To Do
1493	Longest Subarray of 1's After Deleting One Element	Medium	To Do	To Do
1494	Parallel Courses II	Hard	To Do	To Do
1480	Running Sum of 1d Array	Easy	To Do	To Do
1481	Least Number of Unique Integers after K Removals	Medium	To Do	To Do
1482	Minimum Number of Days to Make m Bouquets	Medium	To Do	To Do
1469	Find All The Lonely Nodes 🔒	Easy	To Do	To Do
1486	XOR Operation in an Array	Easy	To Do	To Do
1487	Making File Names Unique	Medium	To Do	To Do
1488	Avoid Flood in The City	Medium	To Do	To Do
1489	Find Critical and Pseudo-Critical Edges in Minimum Spanning Tree	Hard	To Do	To Do
1508	Range Sum of Sorted Subarray Sums	Medium	To Do	To Do
1509	Minimum Difference Between Largest and Smallest Value in Three Moves	Medium	To Do	To Do
1510	Stone Game IV	Hard	To Do	To Do
1474	Delete N Nodes After M Nodes of a Linked List 🔒	Easy	To Do	To Do
1496	Path Crossing	Easy	To Do	To Do
1497	Check If Array Pairs Are Divisible by k	Medium	To Do	To Do
1498	Number of Subsequences That Satisfy the Given Sum Condition	Medium	To Do	To Do
1499	Max Value of Equation	Hard	To Do	To Do
1485	Clone Binary Tree With Random Pointer 🔒	Medium	To Do	To Do
1502	Can Make Arithmetic Progression From Sequence	Easy	To Do	To Do
1503	Last Moment Before All Ants Fall Out of a Plank	Medium	To Do	To Do
1504	Count Submatrices With All Ones	Medium	To Do	To Do
1505	Minimum Possible Integer After at Most K Adjacent Swaps On Digits	Hard	To Do	To Do
1523	Count Odd Numbers in an Interval Range	Easy	To Do	To Do
1524	Number of Sub-arrays With Odd Sum	Medium	To Do	To Do
1525	Number of Good Ways to Split a String	Medium	To Do	To Do
1526	Minimum Number of Increments on Subarrays to Form a Target Array	Hard	To Do	To Do
1490	Clone N-ary Tree 🔒	Medium	To Do	To Do
1512	Number of Good Pairs	Easy	To Do	To Do
1513	Number of Substrings With Only 1s	Medium	To Do	To Do
1531	String Compression II	Hard	To Do	To Do
1515	Best Position for a Service Centre	Hard	To Do	To Do
1500	Design a File Sharing System 🔒	Medium	To Do	To Do
1518	Water Bottles	Easy	To Do	To Do
1519	Number of Nodes in the Sub-Tree With the Same Label	Medium	To Do	To Do
1520	Maximum Number of Non-Overlapping Substrings	Hard	To Do	To Do
1521	Find a Value of a Mysterious Function Closest to Target	Hard	To Do	To Do
1539	Kth Missing Positive Number	Easy	To Do	To Do
1540	Can Convert String in K Moves	Medium	To Do	To Do
1541	Minimum Insertions to Balance a Parentheses String	Medium	To Do	To Do
1546	Maximum Number of Non-Overlapping Subarrays With Sum Equals Target	Medium	To Do	To Do
1506	Find Root of N-Ary Tree 🔒	Medium	To Do	To Do
1528	Shuffle String	Easy	To Do	To Do
1529	Bulb Switcher IV	Medium	To Do	To Do
1530	Number of Good Leaf Nodes Pairs	Medium	To Do	To Do
1516	Move Sub-Tree of N-Ary Tree 🔒	Hard	To Do	To Do
1534	Count Good Triplets	Easy	To Do	To Do
1535	Find the Winner of an Array Game	Medium	To Do	To Do
1536	Minimum Swaps to Arrange a Binary Grid	Medium	To Do	To Do
1537	Get the Maximum Score	Hard	To Do	To Do
1556	Thousand Separator	Easy	To Do	To Do
1557	Minimum Number of Vertices to Reach All Nodes	Medium	To Do	To Do
1558	Minimum Numbers of Function Calls to Make Target Array	Medium	To Do	To Do
1559	Detect Cycles in 2D Grid	Hard	To Do	To Do
1522	Diameter of N-Ary Tree 🔒	Medium	To Do	To Do
1544	Make The String Great	Easy	To Do	To Do
1545	Find Kth Bit in Nth Binary String	Medium	To Do	To Do
1542	Find Longest Awesome Substring	Hard	To Do	To Do
1547	Minimum Cost to Cut a Stick	Hard	To Do	To Do
1533	Find the Index of the Large Integer 🔒	Medium	To Do	To Do
1551	Minimum Operations to Make Array Equal	Medium	To Do	To Do
1552	Magnetic Force Between Two Balls	Medium	To Do	To Do
1553	Minimum Number of Days to Eat N Oranges	Hard	To Do	To Do
1572	Matrix Diagonal Sum	Easy	To Do	To Do
1573	Number of Ways to Split a String	Medium	To Do	To Do
1574	Shortest Subarray to be Removed to Make Array Sorted	Medium	To Do	To Do
1575	Count All Possible Routes	Hard	To Do	To Do
1538	Guess the Majority in a Hidden Array 🔒	Medium	To Do	To Do
1560	Most Visited Sector in a Circular Track	Easy	To Do	To Do
1561	Maximum Number of Coins You Can Get	Medium	To Do	To Do
1562	Find Latest Group of Size M	Medium	To Do	To Do
1563	Stone Game V	Hard	To Do	To Do
1548	The Most Similar Path in a Graph 🔒	Hard	To Do	To Do
1566	Detect Pattern of Length M Repeated K or More Times	Easy	To Do	To Do
1567	Maximum Length of Subarray With Positive Product	Medium	To Do	To Do
1568	Minimum Number of Days to Disconnect Island	Hard	To Do	To Do
1569	Number of Ways to Reorder Array to Get Same BST	Hard	To Do	To Do
1588	Sum of All Odd Length Subarrays	Easy	To Do	To Do
1590	Make Sum Divisible by P	Medium	To Do	To Do
1589	Maximum Sum Obtained of Any Permutation	Medium	To Do	To Do
1591	Strange Printer II	Hard	To Do	To Do
1554	Strings Differ by One Character 🔒	Medium	To Do	To Do
1576	Replace All ?'s to Avoid Consecutive Repeating Characters	Easy	To Do	To Do
1577	Number of Ways Where Square of Number Is Equal to Product of Two Numbers	Medium	To Do	To Do
1578	Minimum Deletion Cost to Avoid Repeating Letters	Medium	To Do	To Do
1579	Remove Max Number of Edges to Keep Graph Fully Traversable	Hard	To Do	To Do
1564	Put Boxes Into the Warehouse I 🔒	Medium	To Do	To Do
1582	Special Positions in a Binary Matrix	Easy	To Do	To Do
1583	Count Unhappy Friends	Medium	To Do	To Do
1584	Min Cost to Connect All Points	Medium	To Do	To Do
1585	Check If String Is Transformable With Substring Sort Operations	Hard	To Do	To Do
1603	Design Parking System	Easy	To Do	To Do
1604	Alert Using Same Key-Card Three or More Times in a One Hour Period	Medium	To Do	To Do
1606	Find Servers That Handled Most Number of Requests	Hard	To Do	To Do
1605	Find Valid Matrix Given Row and Column Sums	Medium	To Do	To Do
1570	Dot Product of Two Sparse Vectors 🔒	Medium	To Do	To Do
1592	Rearrange Spaces Between Words	Easy	To Do	To Do
1593	Split a String Into the Max Number of Unique Substrings	Medium	To Do	To Do
1594	Maximum Non Negative Product in a Matrix	Medium	To Do	To Do
1595	Minimum Cost to Connect Two Groups of Points	Hard	To Do	To Do
1580	Put Boxes Into the Warehouse II 🔒	Medium	To Do	To Do
1598	Crawler Log Folder	Easy	To Do	To Do
1599	Maximum Profit of Operating a Centennial Wheel	Medium	To Do	To Do
1600	Throne Inheritance	Medium	To Do	To Do
1601	Maximum Number of Achievable Transfer Requests	Hard	To Do	To Do
1586	Binary Search Tree Iterator II 🔒	Medium	To Do	To Do
1608	Special Array With X Elements Greater Than or Equal X	Easy	To Do	To Do
1609	Even Odd Tree	Medium	To Do	To Do
1611	Minimum One Bit Operations to Make Integers Zero	Hard	To Do	To Do
1610	Maximum Number of Visible Points	Hard	To Do	To Do
1597	Build Binary Expression Tree From Infix Expression 🔒	Hard	To Do	To Do
1602	Find Nearest Right Node in Binary Tree 🔒	Medium	To Do	To Do