sm2774us / leetcode-1

My solutions of LeetCode problems written in C++, Java, JavaScript, Python and Kotlin

LeetCode

Put my solutions in C++, Java, JavaScript, Python and Kotlin

1. Use Python to solve problems for the 1st time
2. Use JavaScript to solve problems for the 2nd time
3. Use other language to solve problems for the 3rd time

Statistic

Until 2020-01-29 02:55:40, I have solved 209 / 1335 problems while 285 are still locked.

1. Python: 190
2. C++: 13
3. Java: 12
4. JavaScript: 3
5. Kotlin: 1

Note: : locked means you need to buy a book from LeetCode

---

LeetCode Solution Table

ID	Title	Difficulty	Solution	JavaScript	Python	C++	Java	Other
0001	Two Sum	Easy	Solution	JavaScript	Python	C++	Java	Kotlin
0002	Add Two Numbers	Medium	Solution		Python
0003	Longest Substring Without Repeating Characters	Medium	Solution		Python
0004	Median of Two Sorted Arrays	Hard
0005	Longest Palindromic Substring	Medium
0006	ZigZag Conversion	Medium
0007	Reverse Integer	Easy				C++
0008	String to Integer (atoi)	Medium
0009	Palindrome Number	Easy	Solution		Python
0010	Regular Expression Matching	Hard
0011	Container With Most Water	Medium	Solution		Python
0012	Integer to Roman	Medium
0013	Roman to Integer	Easy	Solution		Python
0014	Longest Common Prefix	Easy	Solution		Python
0015	3Sum	Medium	Solution				Java
0016	3Sum Closest	Medium
0017	Letter Combinations of a Phone Number	Medium
0018	4Sum	Medium					Java
0019	Remove Nth Node From End of List	Medium
0020	Valid Parentheses	Easy	Solution		Python
0021	Merge Two Sorted Lists	Easy					Java
0022	Generate Parentheses	Medium
0023	Merge k Sorted Lists	Hard
0024	Swap Nodes in Pairs	Medium
0025	Reverse Nodes in k-Group	Hard
0026	Remove Duplicates from Sorted Array	Easy	Solution		Python		Java
0027	Remove Element	Easy	Solution		Python
0028	Implement strStr()	Easy	Solution		Python
0029	Divide Two Integers	Medium
0030	Substring with Concatenation of All Words	Hard
0031	Next Permutation	Medium
0032	Longest Valid Parentheses	Hard
0033	Search in Rotated Sorted Array	Medium	Solution		Python
0034	Find First and Last Position of Element in Sorted Array	Medium	Solution		Python
0035	Search Insert Position	Easy	Solution		Python
0036	Valid Sudoku	Medium
0037	Sudoku Solver	Hard
0038	Count and Say	Easy	Solution		Python
0039	Combination Sum	Medium	Solution		Python
0040	Combination Sum II	Medium	Solution		Python
0041	First Missing Positive	Hard	Solution		Python
0042	Trapping Rain Water	Hard
0043	Multiply Strings	Medium
0044	Wildcard Matching	Hard
0045	Jump Game II	Hard
0046	Permutations	Medium
0047	Permutations II	Medium
0048	Rotate Image	Medium	Solution		Python
0049	Group Anagrams	Medium
0050	Pow(x, n)	Medium
0051	N-Queens	Hard
0052	N-Queens II	Hard
0053	Maximum Subarray	Easy	Solution		Python
0054	Spiral Matrix	Medium
0055	Jump Game	Medium
0056	Merge Intervals	Medium
0057	Insert Interval	Hard
0058	Length of Last Word	Easy	Solution		Python
0059	Spiral Matrix II	Medium
0060	Permutation Sequence	Medium
0061	Rotate List	Medium
0062	Unique Paths	Medium
0063	Unique Paths II	Medium
0064	Minimum Path Sum	Medium
0065	Valid Number	Hard
0066	Plus One	Easy	Solution		Python
0067	Add Binary	Easy	Solution		Python
0068	Text Justification	Hard
0069	Sqrt(x)	Easy	Solution		Python
0070	Climbing Stairs	Easy
0071	Simplify Path	Medium
0072	Edit Distance	Hard
0073	Set Matrix Zeroes	Medium
0074	Search a 2D Matrix	Medium	Solution		Python
0075	Sort Colors	Medium
0076	Minimum Window Substring	Hard
0077	Combinations	Medium
0078	Subsets	Medium
0079	Word Search	Medium
0080	Remove Duplicates from Sorted Array II	Medium	Solution				Java
0081	Search in Rotated Sorted Array II	Medium
0082	Remove Duplicates from Sorted List II	Medium	Solution				Java
0083	Remove Duplicates from Sorted List	Easy	Solution				Java
0084	Largest Rectangle in Histogram	Hard
0085	Maximal Rectangle	Hard
0086	Partition List	Medium
0087	Scramble String	Hard
0088	Merge Sorted Array	Easy	Solution		Python
0089	Gray Code	Medium
0090	Subsets II	Medium
0091	Decode Ways	Medium
0092	Reverse Linked List II	Medium
0093	Restore IP Addresses	Medium
0094	Binary Tree Inorder Traversal	Medium				C++
0095	Unique Binary Search Trees II	Medium
0096	Unique Binary Search Trees	Medium				C++
0097	Interleaving String	Hard
0098	Validate Binary Search Tree	Medium
0099	Recover Binary Search Tree	Hard
0100	Same Tree	Easy				C++
0101	Symmetric Tree	Easy
0102	Binary Tree Level Order Traversal	Medium
0103	Binary Tree Zigzag Level Order Traversal	Medium
0104	Maximum Depth of Binary Tree	Easy				C++
0105	Construct Binary Tree from Preorder and Inorder Traversal	Medium
0106	Construct Binary Tree from Inorder and Postorder Traversal	Medium
0107	Binary Tree Level Order Traversal II	Easy
0108	Convert Sorted Array to Binary Search Tree	Easy
0109	Convert Sorted List to Binary Search Tree	Medium
0110	Balanced Binary Tree	Easy
0111	Minimum Depth of Binary Tree	Easy
0112	Path Sum	Easy
0113	Path Sum II	Medium
0114	Flatten Binary Tree to Linked List	Medium
0115	Distinct Subsequences	Hard
0116	Populating Next Right Pointers in Each Node	Medium				C++
0117	Populating Next Right Pointers in Each Node II	Medium
0118	Pascal's Triangle	Easy	Solution		Python
0119	Pascal's Triangle II	Easy	Solution		Python
0120	Triangle	Medium
0121	Best Time to Buy and Sell Stock	Easy				C++
0122	Best Time to Buy and Sell Stock II	Easy				C++
0123	Best Time to Buy and Sell Stock III	Hard
0124	Binary Tree Maximum Path Sum	Hard
0125	Valid Palindrome	Easy
0126	Word Ladder II	Hard
0127	Word Ladder	Medium
0128	Longest Consecutive Sequence	Hard	Solution		Python
0129	Sum Root to Leaf Numbers	Medium
0130	Surrounded Regions	Medium
0131	Palindrome Partitioning	Medium
0132	Palindrome Partitioning II	Hard
0133	Clone Graph	Medium
0134	Gas Station	Medium
0135	Candy	Hard
0136	Single Number	Easy				C++
0137	Single Number II	Medium
0138	Copy List with Random Pointer	Medium
0139	Word Break	Medium
0140	Word Break II	Hard
0141	Linked List Cycle	Easy				C++
0142	Linked List Cycle II	Medium
0143	Reorder List	Medium
0144	Binary Tree Preorder Traversal	Medium				C++
0145	Binary Tree Postorder Traversal	Hard
0146	LRU Cache	Medium
0147	Insertion Sort List	Medium
0148	Sort List	Medium
0149	Max Points on a Line	Hard
0150	Evaluate Reverse Polish Notation	Medium
0151	Reverse Words in a String	Medium
0152	Maximum Product Subarray	Medium
0153	Find Minimum in Rotated Sorted Array	Medium
0154	Find Minimum in Rotated Sorted Array II	Hard
0155	Min Stack	Easy
0156	Binary Tree Upside Down 🔒	Medium
0157	Read N Characters Given Read4 🔒	Easy
0158	Read N Characters Given Read4 II - Call multiple times 🔒	Hard
0159	Longest Substring with At Most Two Distinct Characters 🔒	Medium
0160	Intersection of Two Linked Lists	Easy
0161	One Edit Distance 🔒	Medium
0162	Find Peak Element	Medium
0163	Missing Ranges 🔒	Medium
0164	Maximum Gap	Hard
0165	Compare Version Numbers	Medium
0166	Fraction to Recurring Decimal	Medium
0167	Two Sum II - Input array is sorted	Easy	Solution		Python
0168	Excel Sheet Column Title	Easy
0169	Majority Element	Easy	Solution		Python
0170	Two Sum III - Data structure design 🔒	Easy
0171	Excel Sheet Column Number	Easy
0172	Factorial Trailing Zeroes	Easy
0173	Binary Search Tree Iterator	Medium
0174	Dungeon Game	Hard
0175	Combine Two Tables	Easy
0176	Second Highest Salary	Easy
0177	Nth Highest Salary	Medium
0178	Rank Scores	Medium
0179	Largest Number	Medium
0180	Consecutive Numbers	Medium
0181	Employees Earning More Than Their Managers	Easy
0182	Duplicate Emails	Easy
0183	Customers Who Never Order	Easy
0184	Department Highest Salary	Medium
0185	Department Top Three Salaries	Hard
0186	Reverse Words in a String II 🔒	Medium
0187	Repeated DNA Sequences	Medium
0188	Best Time to Buy and Sell Stock IV	Hard
0189	Rotate Array	Easy	Solution		Python
0190	Reverse Bits	Easy	Solution		Python
0191	Number of 1 Bits	Easy
0192	Word Frequency	Medium
0193	Valid Phone Numbers	Easy
0194	Transpose File	Medium
0195	Tenth Line	Easy
0196	Delete Duplicate Emails	Easy
0197	Rising Temperature	Easy
0198	House Robber	Easy	Solution		Python
0199	Binary Tree Right Side View	Medium
0200	Number of Islands	Medium
0201	Bitwise AND of Numbers Range	Medium
0202	Happy Number	Easy
0203	Remove Linked List Elements	Easy
0204	Count Primes	Easy
0205	Isomorphic Strings	Easy
0206	Reverse Linked List	Easy
0207	Course Schedule	Medium
0208	Implement Trie (Prefix Tree)	Medium
0209	Minimum Size Subarray Sum	Medium
0210	Course Schedule II	Medium
0211	Add and Search Word - Data structure design	Medium
0212	Word Search II	Hard
0213	House Robber II	Medium
0214	Shortest Palindrome	Hard
0215	Kth Largest Element in an Array	Medium
0216	Combination Sum III	Medium	Solution		Python
0217	Contains Duplicate	Easy
0218	The Skyline Problem	Hard
0219	Contains Duplicate II	Easy
0220	Contains Duplicate III	Medium
0221	Maximal Square	Medium
0222	Count Complete Tree Nodes	Medium
0223	Rectangle Area	Medium
0224	Basic Calculator	Hard
0225	Implement Stack using Queues	Easy
0226	Invert Binary Tree	Easy
0227	Basic Calculator II	Medium
0228	Summary Ranges	Medium
0229	Majority Element II	Medium
0230	Kth Smallest Element in a BST	Medium
0231	Power of Two	Easy
0232	Implement Queue using Stacks	Easy
0233	Number of Digit One	Hard
0234	Palindrome Linked List	Easy
0235	Lowest Common Ancestor of a Binary Search Tree	Easy
0236	Lowest Common Ancestor of a Binary Tree	Medium
0237	Delete Node in a Linked List	Easy	Solution				Java
0238	Product of Array Except Self	Medium
0239	Sliding Window Maximum	Hard
0240	Search a 2D Matrix II	Medium
0241	Different Ways to Add Parentheses	Medium
0242	Valid Anagram	Easy
0243	Shortest Word Distance 🔒	Easy
0244	Shortest Word Distance II 🔒	Medium
0245	Shortest Word Distance III 🔒	Medium
0246	Strobogrammatic Number 🔒	Easy
0247	Strobogrammatic Number II 🔒	Medium
0248	Strobogrammatic Number III 🔒	Hard
0249	Group Shifted Strings 🔒	Medium
0250	Count Univalue Subtrees 🔒	Medium
0251	Flatten 2D Vector 🔒	Medium
0252	Meeting Rooms 🔒	Easy
0253	Meeting Rooms II 🔒	Medium
0254	Factor Combinations 🔒	Medium
0255	Verify Preorder Sequence in Binary Search Tree 🔒	Medium
0256	Paint House 🔒	Easy
0257	Binary Tree Paths	Easy
0258	Add Digits	Easy
0259	3Sum Smaller 🔒	Medium
0260	Single Number III	Medium
0261	Graph Valid Tree 🔒	Medium
0262	Trips and Users	Hard
0263	Ugly Number	Easy
0264	Ugly Number II	Medium
0265	Paint House II 🔒	Hard
0266	Palindrome Permutation 🔒	Easy
0267	Palindrome Permutation II 🔒	Medium
0268	Missing Number	Easy	Solution		Python
0269	Alien Dictionary 🔒	Hard
0270	Closest Binary Search Tree Value 🔒	Easy
0271	Encode and Decode Strings 🔒	Medium
0272	Closest Binary Search Tree Value II 🔒	Hard
0273	Integer to English Words	Hard
0274	H-Index	Medium
0275	H-Index II	Medium
0276	Paint Fence 🔒	Easy
0277	Find the Celebrity 🔒	Medium
0278	First Bad Version	Easy
0279	Perfect Squares	Medium
0280	Wiggle Sort 🔒	Medium
0281	Zigzag Iterator 🔒	Medium
0282	Expression Add Operators	Hard
0283	Move Zeroes	Easy
0284	Peeking Iterator	Medium
0285	Inorder Successor in BST 🔒	Medium
0286	Walls and Gates 🔒	Medium
0287	Find the Duplicate Number	Medium
0288	Unique Word Abbreviation 🔒	Medium
0289	Game of Life	Medium
0290	Word Pattern	Easy
0291	Word Pattern II 🔒	Hard
0292	Nim Game	Easy
0293	Flip Game 🔒	Easy
0294	Flip Game II 🔒	Medium
0295	Find Median from Data Stream	Hard
0296	Best Meeting Point 🔒	Hard
0297	Serialize and Deserialize Binary Tree	Hard
0298	Binary Tree Longest Consecutive Sequence 🔒	Medium
0299	Bulls and Cows	Easy
0300	Longest Increasing Subsequence	Medium
0301	Remove Invalid Parentheses	Hard
0302	Smallest Rectangle Enclosing Black Pixels 🔒	Hard
0303	Range Sum Query - Immutable	Easy
0304	Range Sum Query 2D - Immutable	Medium
0305	Number of Islands II 🔒	Hard
0306	Additive Number	Medium
0307	Range Sum Query - Mutable	Medium
0308	Range Sum Query 2D - Mutable 🔒	Hard
0309	Best Time to Buy and Sell Stock with Cooldown	Medium
0310	Minimum Height Trees	Medium
0311	Sparse Matrix Multiplication 🔒	Medium
0312	Burst Balloons	Hard
0313	Super Ugly Number	Medium
0314	Binary Tree Vertical Order Traversal 🔒	Medium
0315	Count of Smaller Numbers After Self	Hard
0316	Remove Duplicate Letters	Hard
0317	Shortest Distance from All Buildings 🔒	Hard
0318	Maximum Product of Word Lengths	Medium
0319	Bulb Switcher	Medium
0320	Generalized Abbreviation 🔒	Medium
0321	Create Maximum Number	Hard
0322	Coin Change	Medium
0323	Number of Connected Components in an Undirected Graph 🔒	Medium
0324	Wiggle Sort II	Medium
0325	Maximum Size Subarray Sum Equals k 🔒	Medium
0326	Power of Three	Easy
0327	Count of Range Sum	Hard
0328	Odd Even Linked List	Medium
0329	Longest Increasing Path in a Matrix	Hard
0330	Patching Array	Hard
0331	Verify Preorder Serialization of a Binary Tree	Medium
0332	Reconstruct Itinerary	Medium	Solution		Python
0333	Largest BST Subtree 🔒	Medium
0334	Increasing Triplet Subsequence	Medium
0335	Self Crossing	Hard
0336	Palindrome Pairs	Hard
0337	House Robber III	Medium
0338	Counting Bits	Medium
0339	Nested List Weight Sum 🔒	Easy
0340	Longest Substring with At Most K Distinct Characters 🔒	Hard
0341	Flatten Nested List Iterator	Medium
0342	Power of Four	Easy
0343	Integer Break	Medium
0344	Reverse String	Easy
0345	Reverse Vowels of a String	Easy
0346	Moving Average from Data Stream 🔒	Easy
0347	Top K Frequent Elements	Medium
0348	Design Tic-Tac-Toe 🔒	Medium
0349	Intersection of Two Arrays	Easy
0350	Intersection of Two Arrays II	Easy
0351	Android Unlock Patterns 🔒	Medium
0352	Data Stream as Disjoint Intervals	Hard
0353	Design Snake Game 🔒	Medium
0354	Russian Doll Envelopes	Hard
0355	Design Twitter	Medium
0356	Line Reflection 🔒	Medium
0357	Count Numbers with Unique Digits	Medium
0358	Rearrange String k Distance Apart 🔒	Hard
0359	Logger Rate Limiter 🔒	Easy
0360	Sort Transformed Array 🔒	Medium
0361	Bomb Enemy 🔒	Medium
0362	Design Hit Counter 🔒	Medium
0363	Max Sum of Rectangle No Larger Than K	Hard
0364	Nested List Weight Sum II 🔒	Medium
0365	Water and Jug Problem	Medium
0366	Find Leaves of Binary Tree 🔒	Medium
0367	Valid Perfect Square	Easy
0368	Largest Divisible Subset	Medium
0369	Plus One Linked List 🔒	Medium
0370	Range Addition 🔒	Medium
0371	Sum of Two Integers	Easy
0372	Super Pow	Medium
0373	Find K Pairs with Smallest Sums	Medium
0374	Guess Number Higher or Lower	Easy
0375	Guess Number Higher or Lower II	Medium
0376	Wiggle Subsequence	Medium
0377	Combination Sum IV	Medium	Solution		Python
0378	Kth Smallest Element in a Sorted Matrix	Medium
0379	Design Phone Directory 🔒	Medium
0380	Insert Delete GetRandom O(1)	Medium
0381	Insert Delete GetRandom O(1) - Duplicates allowed	Hard
0382	Linked List Random Node	Medium
0383	Ransom Note	Easy
0384	Shuffle an Array	Medium
0385	Mini Parser	Medium
0386	Lexicographical Numbers	Medium	Solution		Python
0387	First Unique Character in a String	Easy
0388	Longest Absolute File Path	Medium
0389	Find the Difference	Easy	Solution		Python
0390	Elimination Game	Medium
0391	Perfect Rectangle	Hard
0392	Is Subsequence	Easy
0393	UTF-8 Validation	Medium
0394	Decode String	Medium
0395	Longest Substring with At Least K Repeating Characters	Medium
0396	Rotate Function	Medium
0397	Integer Replacement	Medium
0398	Random Pick Index	Medium
0399	Evaluate Division	Medium
0400	Nth Digit	Medium
0401	Binary Watch	Easy
0402	Remove K Digits	Medium
0403	Frog Jump	Hard
0404	Sum of Left Leaves	Easy
0405	Convert a Number to Hexadecimal	Easy
0406	Queue Reconstruction by Height	Medium
0407	Trapping Rain Water II	Hard
0408	Valid Word Abbreviation 🔒	Easy
0409	Longest Palindrome	Easy
0410	Split Array Largest Sum	Hard
0411	Minimum Unique Word Abbreviation 🔒	Hard
0412	Fizz Buzz	Easy
0413	Arithmetic Slices	Medium
0414	Third Maximum Number	Easy
0415	Add Strings	Easy
0416	Partition Equal Subset Sum	Medium	Solution		Python
0417	Pacific Atlantic Water Flow	Medium
0418	Sentence Screen Fitting 🔒	Medium
0419	Battleships in a Board	Medium
0420	Strong Password Checker	Hard
0421	Maximum XOR of Two Numbers in an Array	Medium
0422	Valid Word Square 🔒	Easy
0423	Reconstruct Original Digits from English	Medium
0424	Longest Repeating Character Replacement	Medium
0425	Word Squares 🔒	Hard
0426	Convert Binary Search Tree to Sorted Doubly Linked List 🔒	Medium
0427	Construct Quad Tree	Medium
0428	Serialize and Deserialize N-ary Tree 🔒	Hard
0429	N-ary Tree Level Order Traversal	Medium
0430	Flatten a Multilevel Doubly Linked List	Medium
0431	Encode N-ary Tree to Binary Tree 🔒	Hard
0432	All O`one Data Structure	Hard
0433	Minimum Genetic Mutation	Medium
0434	Number of Segments in a String	Easy
0435	Non-overlapping Intervals	Medium
0436	Find Right Interval	Medium
0437	Path Sum III	Easy
0438	Find All Anagrams in a String	Medium
0439	Ternary Expression Parser 🔒	Medium
0440	K-th Smallest in Lexicographical Order	Hard
0441	Arranging Coins	Easy
0442	Find All Duplicates in an Array	Medium
0443	String Compression	Easy
0444	Sequence Reconstruction 🔒	Medium
0445	Add Two Numbers II	Medium
0446	Arithmetic Slices II - Subsequence	Hard
0447	Number of Boomerangs	Easy
0448	Find All Numbers Disappeared in an Array	Easy
0449	Serialize and Deserialize BST	Medium
0450	Delete Node in a BST	Medium
0451	Sort Characters By Frequency	Medium
0452	Minimum Number of Arrows to Burst Balloons	Medium
0453	Minimum Moves to Equal Array Elements	Easy
0454	4Sum II	Medium					Java
0455	Assign Cookies	Easy
0456	132 Pattern	Medium
0457	Circular Array Loop	Medium
0458	Poor Pigs	Hard
0459	Repeated Substring Pattern	Easy
0460	LFU Cache	Hard
0461	Hamming Distance	Easy
0462	Minimum Moves to Equal Array Elements II	Medium
0463	Island Perimeter	Easy
0464	Can I Win	Medium
0465	Optimal Account Balancing 🔒	Hard
0466	Count The Repetitions	Hard
0467	Unique Substrings in Wraparound String	Medium
0468	Validate IP Address	Medium
0469	Convex Polygon 🔒	Medium
0470	Implement Rand10() Using Rand7()	Medium
0471	Encode String with Shortest Length 🔒	Hard
0472	Concatenated Words	Hard
0473	Matchsticks to Square	Medium
0474	Ones and Zeroes	Medium
0475	Heaters	Easy
0476	Number Complement	Easy
0477	Total Hamming Distance	Medium
0478	Generate Random Point in a Circle	Medium
0479	Largest Palindrome Product	Hard
0480	Sliding Window Median	Hard
0481	Magical String	Medium
0482	License Key Formatting	Easy
0483	Smallest Good Base	Hard
0484	Find Permutation 🔒	Medium
0485	Max Consecutive Ones	Easy
0486	Predict the Winner	Medium
0487	Max Consecutive Ones II 🔒	Medium
0488	Zuma Game	Hard
0489	Robot Room Cleaner 🔒	Hard
0490	The Maze 🔒	Medium
0491	Increasing Subsequences	Medium
0492	Construct the Rectangle	Easy
0493	Reverse Pairs	Hard
0494	Target Sum	Medium
0495	Teemo Attacking	Medium
0496	Next Greater Element I	Easy
0497	Random Point in Non-overlapping Rectangles	Medium
0498	Diagonal Traverse	Medium
0499	The Maze III 🔒	Hard
0500	Keyboard Row	Easy
0501	Find Mode in Binary Search Tree	Easy
0502	IPO	Hard
0503	Next Greater Element II	Medium
0504	Base 7	Easy
0505	The Maze II 🔒	Medium
0506	Relative Ranks	Easy
0507	Perfect Number	Easy
0508	Most Frequent Subtree Sum	Medium
0509	Fibonacci Number	Easy	Solution		Python
0510	Inorder Successor in BST II 🔒	Medium
0511	Game Play Analysis I 🔒	Easy
0512	Game Play Analysis II 🔒	Easy
0513	Find Bottom Left Tree Value	Medium
0514	Freedom Trail	Hard
0515	Find Largest Value in Each Tree Row	Medium
0516	Longest Palindromic Subsequence	Medium
0517	Super Washing Machines	Hard
0518	Coin Change 2	Medium	Solution		Python
0519	Random Flip Matrix	Medium
0520	Detect Capital	Easy
0521	Longest Uncommon Subsequence I	Easy
0522	Longest Uncommon Subsequence II	Medium
0523	Continuous Subarray Sum	Medium
0524	Longest Word in Dictionary through Deleting	Medium
0525	Contiguous Array	Medium
0526	Beautiful Arrangement	Medium
0527	Word Abbreviation 🔒	Hard
0528	Random Pick with Weight	Medium
0529	Minesweeper	Medium
0530	Minimum Absolute Difference in BST	Easy
0531	Lonely Pixel I 🔒	Medium
0532	K-diff Pairs in an Array	Easy
0533	Lonely Pixel II 🔒	Medium
0534	Game Play Analysis III 🔒	Medium
0535	Encode and Decode TinyURL	Medium
0536	Construct Binary Tree from String 🔒	Medium
0537	Complex Number Multiplication	Medium
0538	Convert BST to Greater Tree	Easy
0539	Minimum Time Difference	Medium
0540	Single Element in a Sorted Array	Medium
0541	Reverse String II	Easy	Solution		Python
0542	01 Matrix	Medium
0543	Diameter of Binary Tree	Easy
0544	Output Contest Matches 🔒	Medium
0545	Boundary of Binary Tree 🔒	Medium
0546	Remove Boxes	Hard
0547	Friend Circles	Medium
0548	Split Array with Equal Sum 🔒	Medium
0549	Binary Tree Longest Consecutive Sequence II 🔒	Medium
0550	Game Play Analysis IV 🔒	Medium
0551	Student Attendance Record I	Easy	Solution		Python
0552	Student Attendance Record II	Hard
0553	Optimal Division	Medium
0554	Brick Wall	Medium
0555	Split Concatenated Strings 🔒	Medium
0556	Next Greater Element III	Medium
0557	Reverse Words in a String III	Easy
0558	Quad Tree Intersection	Easy
0559	Maximum Depth of N-ary Tree	Easy
0560	Subarray Sum Equals K	Medium
0561	Array Partition I	Easy
0562	Longest Line of Consecutive One in Matrix 🔒	Medium
0563	Binary Tree Tilt	Easy
0564	Find the Closest Palindrome	Hard
0565	Array Nesting	Medium
0566	Reshape the Matrix	Easy
0567	Permutation in String	Medium
0568	Maximum Vacation Days 🔒	Hard
0569	Median Employee Salary 🔒	Hard
0570	Managers with at Least 5 Direct Reports 🔒	Medium
0571	Find Median Given Frequency of Numbers 🔒	Hard
0572	Subtree of Another Tree	Easy
0573	Squirrel Simulation 🔒	Medium
0574	Winning Candidate 🔒	Medium
0575	Distribute Candies	Easy
0576	Out of Boundary Paths	Medium
0577	Employee Bonus 🔒	Easy
0578	Get Highest Answer Rate Question 🔒	Medium
0579	Find Cumulative Salary of an Employee 🔒	Hard
0580	Count Student Number in Departments 🔒	Medium
0581	Shortest Unsorted Continuous Subarray	Easy
0582	Kill Process 🔒	Medium
0583	Delete Operation for Two Strings	Medium
0584	Find Customer Referee 🔒	Easy
0585	Investments in 2016 🔒	Medium
0586	Customer Placing the Largest Number of Orders 🔒	Easy
0587	Erect the Fence	Hard
0588	Design In-Memory File System 🔒	Hard
0589	N-ary Tree Preorder Traversal	Easy
0590	N-ary Tree Postorder Traversal	Easy
0591	Tag Validator	Hard
0592	Fraction Addition and Subtraction	Medium
0593	Valid Square	Medium
0594	Longest Harmonious Subsequence	Easy
0595	Big Countries	Easy
0596	Classes More Than 5 Students	Easy
0597	Friend Requests I: Overall Acceptance Rate 🔒	Easy
0598	Range Addition II	Easy
0599	Minimum Index Sum of Two Lists	Easy
0600	Non-negative Integers without Consecutive Ones	Hard
0601	Human Traffic of Stadium	Hard
0602	Friend Requests II: Who Has the Most Friends 🔒	Medium
0603	Consecutive Available Seats 🔒	Easy
0604	Design Compressed String Iterator 🔒	Easy
0605	Can Place Flowers	Easy
0606	Construct String from Binary Tree	Easy
0607	Sales Person 🔒	Easy
0608	Tree Node 🔒	Medium
0609	Find Duplicate File in System	Medium
0610	Triangle Judgement 🔒	Easy
0611	Valid Triangle Number	Medium
0612	Shortest Distance in a Plane 🔒	Medium
0613	Shortest Distance in a Line 🔒	Easy
0614	Second Degree Follower 🔒	Medium
0615	Average Salary: Departments VS Company 🔒	Hard
0616	Add Bold Tag in String 🔒	Medium
0617	Merge Two Binary Trees	Easy
0618	Students Report By Geography 🔒	Hard
0619	Biggest Single Number 🔒	Easy
0620	Not Boring Movies	Easy
0621	Task Scheduler	Medium
0622	Design Circular Queue	Medium
0623	Add One Row to Tree	Medium
0624	Maximum Distance in Arrays 🔒	Easy
0625	Minimum Factorization 🔒	Medium
0626	Exchange Seats	Medium
0627	Swap Salary	Easy
0628	Maximum Product of Three Numbers	Easy
0629	K Inverse Pairs Array	Hard
0630	Course Schedule III	Hard
0631	Design Excel Sum Formula 🔒	Hard
0632	Smallest Range Covering Elements from K Lists	Hard
0633	Sum of Square Numbers	Easy
0634	Find the Derangement of An Array 🔒	Medium
0635	Design Log Storage System 🔒	Medium
0636	Exclusive Time of Functions	Medium
0637	Average of Levels in Binary Tree	Easy
0638	Shopping Offers	Medium
0639	Decode Ways II	Hard
0640	Solve the Equation	Medium
0641	Design Circular Deque	Medium
0642	Design Search Autocomplete System 🔒	Hard
0643	Maximum Average Subarray I	Easy
0644	Maximum Average Subarray II 🔒	Hard
0645	Set Mismatch	Easy
0646	Maximum Length of Pair Chain	Medium
0647	Palindromic Substrings	Medium
0648	Replace Words	Medium
0649	Dota2 Senate	Medium
0650	2 Keys Keyboard	Medium
0651	4 Keys Keyboard 🔒	Medium
0652	Find Duplicate Subtrees	Medium
0653	Two Sum IV - Input is a BST	Easy	Solution		Python
0654	Maximum Binary Tree	Medium
0655	Print Binary Tree	Medium
0656	Coin Path 🔒	Hard
0657	Robot Return to Origin	Easy	Solution		Python
0658	Find K Closest Elements	Medium
0659	Split Array into Consecutive Subsequences	Medium
0660	Remove 9 🔒	Hard
0661	Image Smoother	Easy
0662	Maximum Width of Binary Tree	Medium
0663	Equal Tree Partition 🔒	Medium
0664	Strange Printer	Hard
0665	Non-decreasing Array	Easy
0666	Path Sum IV 🔒	Medium
0667	Beautiful Arrangement II	Medium
0668	Kth Smallest Number in Multiplication Table	Hard
0669	Trim a Binary Search Tree	Easy
0670	Maximum Swap	Medium
0671	Second Minimum Node In a Binary Tree	Easy
0672	Bulb Switcher II	Medium
0673	Number of Longest Increasing Subsequence	Medium
0674	Longest Continuous Increasing Subsequence	Easy
0675	Cut Off Trees for Golf Event	Hard
0676	Implement Magic Dictionary	Medium
0677	Map Sum Pairs	Medium
0678	Valid Parenthesis String	Medium
0679	24 Game	Hard
0680	Valid Palindrome II	Easy
0681	Next Closest Time 🔒	Medium
0682	Baseball Game	Easy
0683	K Empty Slots 🔒	Hard
0684	Redundant Connection	Medium
0685	Redundant Connection II	Hard
0686	Repeated String Match	Easy
0687	Longest Univalue Path	Easy
0688	Knight Probability in Chessboard	Medium
0689	Maximum Sum of 3 Non-Overlapping Subarrays	Hard
0690	Employee Importance	Easy
0691	Stickers to Spell Word	Hard
0692	Top K Frequent Words	Medium
0693	Binary Number with Alternating Bits	Easy
0694	Number of Distinct Islands 🔒	Medium
0695	Max Area of Island	Medium
0696	Count Binary Substrings	Easy
0697	Degree of an Array	Easy
0698	Partition to K Equal Sum Subsets	Medium
0699	Falling Squares	Hard
0700	Search in a Binary Search Tree	Easy
0701	Insert into a Binary Search Tree	Medium
0702	Search in a Sorted Array of Unknown Size 🔒	Medium
0703	Kth Largest Element in a Stream	Easy
0704	Binary Search	Easy
0705	Design HashSet	Easy
0706	Design HashMap	Easy
0707	Design Linked List	Medium
0708	Insert into a Sorted Circular Linked List 🔒	Medium
0709	To Lower Case	Easy
0710	Random Pick with Blacklist	Hard
0711	Number of Distinct Islands II 🔒	Hard
0712	Minimum ASCII Delete Sum for Two Strings	Medium
0713	Subarray Product Less Than K	Medium
0714	Best Time to Buy and Sell Stock with Transaction Fee	Medium
0715	Range Module	Hard
0716	Max Stack 🔒	Easy
0717	1-bit and 2-bit Characters	Easy
0718	Maximum Length of Repeated Subarray	Medium
0719	Find K-th Smallest Pair Distance	Hard
0720	Longest Word in Dictionary	Easy
0721	Accounts Merge	Medium
0722	Remove Comments	Medium
0723	Candy Crush 🔒	Medium
0724	Find Pivot Index	Easy
0725	Split Linked List in Parts	Medium
0726	Number of Atoms	Hard
0727	Minimum Window Subsequence 🔒	Hard
0728	Self Dividing Numbers	Easy
0729	My Calendar I	Medium
0730	Count Different Palindromic Subsequences	Hard
0731	My Calendar II	Medium
0732	My Calendar III	Hard
0733	Flood Fill	Easy
0734	Sentence Similarity 🔒	Easy
0735	Asteroid Collision	Medium
0736	Parse Lisp Expression	Hard
0737	Sentence Similarity II 🔒	Medium
0738	Monotone Increasing Digits	Medium
0739	Daily Temperatures	Medium
0740	Delete and Earn	Medium
0741	Cherry Pickup	Hard
0742	Closest Leaf in a Binary Tree 🔒	Medium
0743	Network Delay Time	Medium
0744	Find Smallest Letter Greater Than Target	Easy
0745	Prefix and Suffix Search	Hard
0746	Min Cost Climbing Stairs	Easy	Solution		Python
0747	Largest Number At Least Twice of Others	Easy
0748	Shortest Completing Word	Easy
0749	Contain Virus	Hard
0750	Number Of Corner Rectangles 🔒	Medium
0751	IP to CIDR 🔒	Easy
0752	Open the Lock	Medium
0753	Cracking the Safe	Hard
0754	Reach a Number	Medium
0755	Pour Water 🔒	Medium
0756	Pyramid Transition Matrix	Medium
0757	Set Intersection Size At Least Two	Hard
0758	Bold Words in String 🔒	Easy
0759	Employee Free Time 🔒	Hard
0760	Find Anagram Mappings 🔒	Easy
0761	Special Binary String	Hard
0762	Prime Number of Set Bits in Binary Representation	Easy
0763	Partition Labels	Medium
0764	Largest Plus Sign	Medium
0765	Couples Holding Hands	Hard
0766	Toeplitz Matrix	Easy
0767	Reorganize String	Medium
0768	Max Chunks To Make Sorted II	Hard
0769	Max Chunks To Make Sorted	Medium
0770	Basic Calculator IV	Hard
0771	Jewels and Stones	Easy	Solution		Python
0772	Basic Calculator III 🔒	Hard
0773	Sliding Puzzle	Hard
0774	Minimize Max Distance to Gas Station 🔒	Hard
0775	Global and Local Inversions	Medium
0776	Split BST 🔒	Medium
0777	Swap Adjacent in LR String	Medium
0778	Swim in Rising Water	Hard
0779	K-th Symbol in Grammar	Medium
0780	Reaching Points	Hard
0781	Rabbits in Forest	Medium
0782	Transform to Chessboard	Hard
0783	Minimum Distance Between BST Nodes	Easy
0784	Letter Case Permutation	Easy
0785	Is Graph Bipartite?	Medium
0786	K-th Smallest Prime Fraction	Hard
0787	Cheapest Flights Within K Stops	Medium
0788	Rotated Digits	Easy	Solution		Python
0789	Escape The Ghosts	Medium
0790	Domino and Tromino Tiling	Medium
0791	Custom Sort String	Medium
0792	Number of Matching Subsequences	Medium
0793	Preimage Size of Factorial Zeroes Function	Hard
0794	Valid Tic-Tac-Toe State	Medium
0795	Number of Subarrays with Bounded Maximum	Medium
0796	Rotate String	Easy
0797	All Paths From Source to Target	Medium
0798	Smallest Rotation with Highest Score	Hard
0799	Champagne Tower	Medium
0800	Similar RGB Color 🔒	Easy
0801	Minimum Swaps To Make Sequences Increasing	Medium
0802	Find Eventual Safe States	Medium
0803	Bricks Falling When Hit	Hard
0804	Unique Morse Code Words	Easy
0805	Split Array With Same Average	Hard
0806	Number of Lines To Write String	Easy
0807	Max Increase to Keep City Skyline	Medium
0808	Soup Servings	Medium
0809	Expressive Words	Medium
0810	Chalkboard XOR Game	Hard
0811	Subdomain Visit Count	Easy
0812	Largest Triangle Area	Easy
0813	Largest Sum of Averages	Medium
0814	Binary Tree Pruning	Medium
0815	Bus Routes	Hard
0816	Ambiguous Coordinates	Medium
0817	Linked List Components	Medium
0818	Race Car	Hard
0819	Most Common Word	Easy
0820	Short Encoding of Words	Medium
0821	Shortest Distance to a Character	Easy
0822	Card Flipping Game	Medium
0823	Binary Trees With Factors	Medium
0824	Goat Latin	Easy
0825	Friends Of Appropriate Ages	Medium
0826	Most Profit Assigning Work	Medium
0827	Making A Large Island	Hard
0828	Unique Letter String	Hard
0829	Consecutive Numbers Sum	Hard
0830	Positions of Large Groups	Easy
0831	Masking Personal Information	Medium
0832	Flipping an Image	Easy
0833	Find And Replace in String	Medium
0834	Sum of Distances in Tree	Hard
0835	Image Overlap	Medium
0836	Rectangle Overlap	Easy
0837	New 21 Game	Medium
0838	Push Dominoes	Medium
0839	Similar String Groups	Hard
0840	Magic Squares In Grid	Easy
0841	Keys and Rooms	Medium
0842	Split Array into Fibonacci Sequence	Medium
0843	Guess the Word	Hard
0844	Backspace String Compare	Easy
0845	Longest Mountain in Array	Medium
0846	Hand of Straights	Medium
0847	Shortest Path Visiting All Nodes	Hard
0848	Shifting Letters	Medium
0849	Maximize Distance to Closest Person	Easy
0850	Rectangle Area II	Hard
0851	Loud and Rich	Medium
0852	Peak Index in a Mountain Array	Easy	Solution		Python
0853	Car Fleet	Medium
0854	K-Similar Strings	Hard
0855	Exam Room	Medium
0856	Score of Parentheses	Medium
0857	Minimum Cost to Hire K Workers	Hard
0858	Mirror Reflection	Medium
0859	Buddy Strings	Easy
0860	Lemonade Change	Easy
0861	Score After Flipping Matrix	Medium
0862	Shortest Subarray with Sum at Least K	Hard
0863	All Nodes Distance K in Binary Tree	Medium
0864	Shortest Path to Get All Keys	Hard
0865	Smallest Subtree with all the Deepest Nodes	Medium
0866	Prime Palindrome	Medium
0867	Transpose Matrix	Easy
0868	Binary Gap	Easy
0869	Reordered Power of 2	Medium
0870	Advantage Shuffle	Medium
0871	Minimum Number of Refueling Stops	Hard
0872	Leaf-Similar Trees	Easy
0873	Length of Longest Fibonacci Subsequence	Medium
0874	Walking Robot Simulation	Easy
0875	Koko Eating Bananas	Medium
0876	Middle of the Linked List	Easy
0877	Stone Game	Medium
0878	Nth Magical Number	Hard
0879	Profitable Schemes	Hard
0880	Decoded String at Index	Medium
0881	Boats to Save People	Medium
0882	Reachable Nodes In Subdivided Graph	Hard
0883	Projection Area of 3D Shapes	Easy
0884	Uncommon Words from Two Sentences	Easy
0885	Spiral Matrix III	Medium
0886	Possible Bipartition	Medium
0887	Super Egg Drop	Hard
0888	Fair Candy Swap	Easy
0889	Construct Binary Tree from Preorder and Postorder Traversal	Medium
0890	Find and Replace Pattern	Medium
0891	Sum of Subsequence Widths	Hard
0892	Surface Area of 3D Shapes	Easy
0893	Groups of Special-Equivalent Strings	Easy
0894	All Possible Full Binary Trees	Medium
0895	Maximum Frequency Stack	Hard
0896	Monotonic Array	Easy
0897	Increasing Order Search Tree	Easy
0898	Bitwise ORs of Subarrays	Medium
0899	Orderly Queue	Hard
0900	RLE Iterator	Medium
0901	Online Stock Span	Medium
0902	Numbers At Most N Given Digit Set	Hard
0903	Valid Permutations for DI Sequence	Hard
0904	Fruit Into Baskets	Medium
0905	Sort Array By Parity	Easy	Solution		Python
0906	Super Palindromes	Hard
0907	Sum of Subarray Minimums	Medium
0908	Smallest Range I	Easy
0909	Snakes and Ladders	Medium
0910	Smallest Range II	Medium
0911	Online Election	Medium
0912	Sort an Array	Medium
0913	Cat and Mouse	Hard
0914	X of a Kind in a Deck of Cards	Easy
0915	Partition Array into Disjoint Intervals	Medium
0916	Word Subsets	Medium
0917	Reverse Only Letters	Easy
0918	Maximum Sum Circular Subarray	Medium
0919	Complete Binary Tree Inserter	Medium
0920	Number of Music Playlists	Hard
0921	Minimum Add to Make Parentheses Valid	Medium
0922	Sort Array By Parity II	Easy	Solution		Python
0923	3Sum With Multiplicity	Medium
0924	Minimize Malware Spread	Hard
0925	Long Pressed Name	Easy
0926	Flip String to Monotone Increasing	Medium
0927	Three Equal Parts	Hard
0928	Minimize Malware Spread II	Hard
0929	Unique Email Addresses	Easy
0930	Binary Subarrays With Sum	Medium
0931	Minimum Falling Path Sum	Medium
0932	Beautiful Array	Medium
0933	Number of Recent Calls	Easy
0934	Shortest Bridge	Medium
0935	Knight Dialer	Medium
0936	Stamping The Sequence	Hard
0937	Reorder Data in Log Files	Easy
0938	Range Sum of BST	Easy
0939	Minimum Area Rectangle	Medium
0940	Distinct Subsequences II	Hard
0941	Valid Mountain Array	Easy
0942	DI String Match	Easy
0943	Find the Shortest Superstring	Hard
0944	Delete Columns to Make Sorted	Easy
0945	Minimum Increment to Make Array Unique	Medium
0946	Validate Stack Sequences	Medium
0947	Most Stones Removed with Same Row or Column	Medium
0948	Bag of Tokens	Medium
0949	Largest Time for Given Digits	Easy
0950	Reveal Cards In Increasing Order	Medium
0951	Flip Equivalent Binary Trees	Medium
0952	Largest Component Size by Common Factor	Hard
0953	Verifying an Alien Dictionary	Easy
0954	Array of Doubled Pairs	Medium
0955	Delete Columns to Make Sorted II	Medium
0956	Tallest Billboard	Hard
0957	Prison Cells After N Days	Medium
0958	Check Completeness of a Binary Tree	Medium
0959	Regions Cut By Slashes	Medium
0960	Delete Columns to Make Sorted III	Hard
0961	N-Repeated Element in Size 2N Array	Easy
0962	Maximum Width Ramp	Medium
0963	Minimum Area Rectangle II	Medium
0964	Least Operators to Express Number	Hard
0965	Univalued Binary Tree	Easy
0966	Vowel Spellchecker	Medium
0967	Numbers With Same Consecutive Differences	Medium
0968	Binary Tree Cameras	Hard
0969	Pancake Sorting	Medium
0970	Powerful Integers	Easy
0971	Flip Binary Tree To Match Preorder Traversal	Medium
0972	Equal Rational Numbers	Hard
0973	K Closest Points to Origin	Medium
0974	Subarray Sums Divisible by K	Medium
0975	Odd Even Jump	Hard
0976	Largest Perimeter Triangle	Easy
0977	Squares of a Sorted Array	Easy	Solution		Python
0978	Longest Turbulent Subarray	Medium	Solution		Python
0979	Distribute Coins in Binary Tree	Medium	Solution		Python
0980	Unique Paths III	Hard
0981	Time Based Key-Value Store	Medium	Solution		Python
0982	Triples with Bitwise AND Equal To Zero	Hard
0983	Minimum Cost For Tickets	Medium
0984	String Without AAA or BBB	Medium	Solution		Python
0985	Sum of Even Numbers After Queries	Easy	Solution		Python
0986	Interval List Intersections	Medium
0987	Vertical Order Traversal of a Binary Tree	Medium	Solution		Python
0988	Smallest String Starting From Leaf	Medium	Solution		Python
0989	Add to Array-Form of Integer	Easy
0990	Satisfiability of Equality Equations	Medium
0991	Broken Calculator	Medium
0992	Subarrays with K Different Integers	Hard
0993	Cousins in Binary Tree	Easy
0994	Rotting Oranges	Easy
0995	Minimum Number of K Consecutive Bit Flips	Hard
0996	Number of Squareful Arrays	Hard
0997	Find the Town Judge	Easy
0998	Maximum Binary Tree II	Medium
0999	Available Captures for Rook	Easy
1000	Minimum Cost to Merge Stones	Hard
1001	Grid Illumination	Hard
1002	Find Common Characters	Easy	Solution		Python
1003	Check If Word Is Valid After Substitutions	Medium	Solution		Python
1004	Max Consecutive Ones III	Medium	Solution		Python
1005	Maximize Sum Of Array After K Negations	Easy	Solution		Python
1006	Clumsy Factorial	Medium	Solution		Python
1007	Minimum Domino Rotations For Equal Row	Medium	Solution		Python
1008	Construct Binary Search Tree from Preorder Traversal	Medium	Solution		Python
1009	Complement of Base 10 Integer	Easy
1010	Pairs of Songs With Total Durations Divisible by 60	Easy
1011	Capacity To Ship Packages Within D Days	Medium
1012	Numbers With Repeated Digits	Hard
1013	Partition Array Into Three Parts With Equal Sum	Easy
1014	Best Sightseeing Pair	Medium
1015	Smallest Integer Divisible by K	Medium
1016	Binary String With Substrings Representing 1 To N	Medium
1017	Convert to Base -2	Medium	Solution		Python
1018	Binary Prefix Divisible By 5	Easy	Solution		Python
1019	Next Greater Node In Linked List	Medium	Solution		Python
1020	Number of Enclaves	Medium	Solution		Python
1021	Remove Outermost Parentheses	Easy
1022	Sum of Root To Leaf Binary Numbers	Easy
1023	Camelcase Matching	Medium
1024	Video Stitching	Medium
1025	Divisor Game	Easy	Solution		Python
1026	Maximum Difference Between Node and Ancestor	Medium	Solution		Python
1027	Longest Arithmetic Sequence	Medium	Solution		Python
1028	Recover a Tree From Preorder Traversal	Hard
1029	Two City Scheduling	Easy			Python
1030	Matrix Cells in Distance Order	Easy			Python
1031	Maximum Sum of Two Non-Overlapping Subarrays	Medium			Python
1032	Stream of Characters	Hard
1033	Moving Stones Until Consecutive	Easy
1034	Coloring A Border	Medium
1035	Uncrossed Lines	Medium
1036	Escape a Large Maze	Hard
1037	Valid Boomerang	Easy
1038	Binary Search Tree to Greater Sum Tree	Medium
1039	Minimum Score Triangulation of Polygon	Medium
1040	Moving Stones Until Consecutive II	Medium
1041	Robot Bounded In Circle	Medium
1042	Flower Planting With No Adjacent	Easy
1043	Partition Array for Maximum Sum	Medium
1044	Longest Duplicate Substring	Hard
1045	Customers Who Bought All Products 🔒	Medium
1046	Last Stone Weight	Easy	Solution		Python
1047	Remove All Adjacent Duplicates In String	Easy	Solution		Python
1048	Longest String Chain	Medium	Solution		Python
1049	Last Stone Weight II	Medium
1050	Actors and Directors Who Cooperated At Least Three Times 🔒	Easy
1051	Height Checker	Easy
1052	Grumpy Bookstore Owner	Medium
1053	Previous Permutation With One Swap	Medium
1054	Distant Barcodes	Medium
1055	Shortest Way to Form String 🔒	Medium
1056	Confusing Number 🔒	Easy
1057	Campus Bikes 🔒	Medium
1058	Minimize Rounding Error to Meet Target 🔒	Medium
1059	All Paths from Source Lead to Destination 🔒	Medium
1060	Missing Element in Sorted Array 🔒	Medium
1061	Lexicographically Smallest Equivalent String 🔒	Medium
1062	Longest Repeating Substring 🔒	Medium
1063	Number of Valid Subarrays 🔒	Hard
1064	Fixed Point 🔒	Easy
1065	Index Pairs of a String 🔒	Easy
1066	Campus Bikes II 🔒	Medium
1067	Digit Count in Range 🔒	Hard
1068	Product Sales Analysis I 🔒	Easy
1069	Product Sales Analysis II 🔒	Easy
1070	Product Sales Analysis III 🔒	Medium
1071	Greatest Common Divisor of Strings	Easy	Solution		Python
1072	Flip Columns For Maximum Number of Equal Rows	Medium
1073	Adding Two Negabinary Numbers	Medium
1074	Number of Submatrices That Sum to Target	Hard
1075	Project Employees I 🔒	Easy
1076	Project Employees II 🔒	Easy
1077	Project Employees III 🔒	Medium
1078	Occurrences After Bigram	Easy
1079	Letter Tile Possibilities	Medium
1080	Insufficient Nodes in Root to Leaf Paths	Medium
1081	Smallest Subsequence of Distinct Characters	Medium
1082	Sales Analysis I 🔒	Easy
1083	Sales Analysis II 🔒	Easy
1084	Sales Analysis III 🔒	Easy
1085	Sum of Digits in the Minimum Number 🔒	Easy
1086	High Five 🔒	Easy
1087	Brace Expansion 🔒	Medium
1088	Confusing Number II 🔒	Hard
1089	Duplicate Zeros	Easy	Solution		Python
1090	Largest Values From Labels	Medium
1091	Shortest Path in Binary Matrix	Medium
1092	Shortest Common Supersequence	Hard
1093	Statistics from a Large Sample	Medium
1094	Car Pooling	Medium
1095	Find in Mountain Array	Hard
1096	Brace Expansion II	Hard
1097	Game Play Analysis V 🔒	Hard
1098	Unpopular Books 🔒	Medium
1099	Two Sum Less Than K 🔒	Easy
1100	Find K-Length Substrings With No Repeated Characters 🔒	Medium
1101	The Earliest Moment When Everyone Become Friends 🔒	Medium
1102	Path With Maximum Minimum Value 🔒	Medium
1103	Distribute Candies to People	Easy	Solution		Python
1104	Path In Zigzag Labelled Binary Tree	Medium	Solution		Python
1105	Filling Bookcase Shelves	Medium
1106	Parsing A Boolean Expression	Hard
1107	New Users Daily Count 🔒	Medium
1108	Defanging an IP Address	Easy	Solution		Python
1109	Corporate Flight Bookings	Medium	Solution		Python		Java
1110	Delete Nodes And Return Forest	Medium	Solution		Python
1111	Maximum Nesting Depth of Two Valid Parentheses Strings	Medium	Solution		Python
1112	Highest Grade For Each Student 🔒	Medium
1113	Reported Posts 🔒	Easy
1114	Print in Order	Easy	Solution		Python
1115	Print FooBar Alternately	Medium
1116	Print Zero Even Odd	Medium
1117	Building H2O	Medium
1118	Number of Days in a Month 🔒	Easy	Solution		Python
1119	Remove Vowels from a String 🔒	Easy	Solution		Python
1120	Maximum Average Subtree 🔒	Medium	Solution		Python
1121	Divide Array Into Increasing Sequences 🔒	Hard	Solution		Python
1122	Relative Sort Array	Easy	Solution		Python
1123	Lowest Common Ancestor of Deepest Leaves	Medium	Solution		Python
1124	Longest Well-Performing Interval	Medium	Solution		Python	C++
1125	Smallest Sufficient Team	Hard	Solution		Python
1126	Active Businesses 🔒	Medium
1127	User Purchase Platform 🔒	Hard
1128	Number of Equivalent Domino Pairs	Easy	Solution		Python
1129	Shortest Path with Alternating Colors	Medium	Solution		Python
1130	Minimum Cost Tree From Leaf Values	Medium	Solution		Python
1131	Maximum of Absolute Value Expression	Medium
1132	Reported Posts II 🔒	Medium
1133	Largest Unique Number 🔒	Easy	Solution		Python
1134	Armstrong Number 🔒	Easy	Solution		Python
1135	Connecting Cities With Minimum Cost 🔒	Medium	Solution		Python
1136	Parallel Courses 🔒	Hard	Solution		Python
1137	N-th Tribonacci Number	Easy	Solution		Python
1138	Alphabet Board Path	Medium	Solution		Python
1139	Largest 1-Bordered Square	Medium	Solution		Python
1140	Stone Game II	Medium	Solution		Python
1141	User Activity for the Past 30 Days I 🔒	Easy
1142	User Activity for the Past 30 Days II 🔒	Easy
1143	Longest Common Subsequence	Medium
1144	Decrease Elements To Make Array Zigzag	Medium	Solution		Python
1145	Binary Tree Coloring Game	Medium	Solution		Python
1146	Snapshot Array	Medium	Solution		Python
1147	Longest Chunked Palindrome Decomposition	Hard	Solution		Python
1148	Article Views I 🔒	Easy
1149	Article Views II 🔒	Medium
1150	Check If a Number Is Majority Element in a Sorted Array 🔒	Easy	Solution		Python
1151	Minimum Swaps to Group All 1's Together 🔒	Medium	Solution		Python
1152	Analyze User Website Visit Pattern 🔒	Medium	Solution		Python
1153	String Transforms Into Another String 🔒	Hard	Solution		Python
1154	Day of the Year	Easy	Solution		Python		Java
1155	Number of Dice Rolls With Target Sum	Medium	Solution		Python
1156	Swap For Longest Repeated Character Substring	Medium	Solution		Python
1157	Online Majority Element In Subarray	Hard
1158	Market Analysis I 🔒	Medium
1159	Market Analysis II 🔒	Hard
1160	Find Words That Can Be Formed by Characters	Easy	Solution		Python
1161	Maximum Level Sum of a Binary Tree	Medium	Solution		Python
1162	As Far from Land as Possible	Medium	Solution		Python
1163	Last Substring in Lexicographical Order	Hard	Solution		Python
1164	Product Price at a Given Date 🔒	Medium
1165	Single-Row Keyboard 🔒	Easy	Solution		Python
1166	Design File System 🔒	Medium	Solution		Python
1167	Minimum Cost to Connect Sticks 🔒	Medium	Solution		Python
1168	Optimize Water Distribution in a Village 🔒	Hard	Solution		Python
1169	Invalid Transactions	Medium	Solution		Python
1170	Compare Strings by Frequency of the Smallest Character	Easy	Solution		Python
1171	Remove Zero Sum Consecutive Nodes from Linked List	Medium	Solution		Python
1172	Dinner Plate Stacks	Hard	Solution		Python
1173	Immediate Food Delivery I 🔒	Easy
1174	Immediate Food Delivery II 🔒	Medium
1175	Prime Arrangements	Easy	Solution		Python
1176	Diet Plan Performance 🔒	Easy	Solution		Python
1177	Can Make Palindrome from Substring	Medium	Solution		Python
1178	Number of Valid Words for Each Puzzle	Hard	Solution		Python
1179	Reformat Department Table	Easy
1180	Count Substrings with Only One Distinct Letter 🔒	Easy	Solution		Python
1181	Before and After Puzzle 🔒	Medium	Solution		Python
1182	Shortest Distance to Target Color 🔒	Medium	Solution		Python
1183	Maximum Number of Ones 🔒	Hard	Solution		Python
1184	Distance Between Bus Stops	Easy	Solution		Python
1185	Day of the Week	Easy	Solution		Python
1186	Maximum Subarray Sum with One Deletion	Medium	Solution		Python
1187	Make Array Strictly Increasing	Hard	Solution		Python
1188	Design Bounded Blocking Queue 🔒	Medium
1189	Maximum Number of Balloons	Easy	Solution		Python
1190	Reverse Substrings Between Each Pair of Parentheses	Medium	Solution		Python
1191	K-Concatenation Maximum Sum	Medium	Solution		Python
1192	Critical Connections in a Network	Hard
1193	Monthly Transactions I 🔒	Medium
1194	Tournament Winners 🔒	Hard
1195	Fizz Buzz Multithreaded	Medium
1196	How Many Apples Can You Put into the Basket 🔒	Easy	Solution		Python
1197	Minimum Knight Moves 🔒	Medium	Solution		Python
1198	Find Smallest Common Element in All Rows 🔒	Medium	Solution		Python
1199	Minimum Time to Build Blocks 🔒	Hard
1200	Minimum Absolute Difference	Easy	Solution		Python
1201	Ugly Number III	Medium	Solution		Python
1202	Smallest String With Swaps	Medium	Solution		Python
1203	Sort Items by Groups Respecting Dependencies	Hard
1204	Last Person to Fit in the Elevator 🔒	Medium
1205	Monthly Transactions II 🔒	Medium
1206	Design Skiplist	Hard
1207	Unique Number of Occurrences	Easy
1208	Get Equal Substrings Within Budget	Medium
1209	Remove All Adjacent Duplicates in String II	Medium
1210	Minimum Moves to Reach Target with Rotations	Hard
1211	Queries Quality and Percentage 🔒	Easy
1212	Team Scores in Football Tournament 🔒	Medium
1213	Intersection of Three Sorted Arrays 🔒	Easy
1214	Two Sum BSTs 🔒	Medium
1215	Stepping Numbers 🔒	Medium
1216	Valid Palindrome III 🔒	Hard
1217	Play with Chips	Easy
1218	Longest Arithmetic Subsequence of Given Difference	Medium
1219	Path with Maximum Gold	Medium
1220	Count Vowels Permutation	Hard
1221	Split a String in Balanced Strings	Easy
1222	Queens That Can Attack the King	Medium
1223	Dice Roll Simulation	Medium
1224	Maximum Equal Frequency	Hard
1225	Report Contiguous Dates 🔒	Hard
1226	The Dining Philosophers	Medium
1227	Airplane Seat Assignment Probability	Medium
1228	Missing Number In Arithmetic Progression 🔒	Easy
1229	Meeting Scheduler 🔒	Medium
1230	Toss Strange Coins 🔒	Medium
1231	Divide Chocolate 🔒	Hard
1232	Check If It Is a Straight Line	Easy
1233	Remove Sub-Folders from the Filesystem	Medium
1234	Replace the Substring for Balanced String	Medium
1235	Maximum Profit in Job Scheduling	Hard
1236	Web Crawler 🔒	Medium
1237	Find Positive Integer Solution for a Given Equation	Easy
1238	Circular Permutation in Binary Representation	Medium
1239	Maximum Length of a Concatenated String with Unique Characters	Medium
1240	Tiling a Rectangle with the Fewest Squares	Hard
1241	Number of Comments per Post 🔒	Easy
1242	Web Crawler Multithreaded 🔒	Medium
1243	Array Transformation 🔒	Easy	Solution		Python
1244	Design A Leaderboard 🔒	Medium	Solution		Python
1245	Tree Diameter 🔒	Medium
1246	Palindrome Removal 🔒	Hard
1247	Minimum Swaps to Make Strings Equal	Medium	Solution		Python
1248	Count Number of Nice Subarrays	Medium	Solution		Python
1249	Minimum Remove to Make Valid Parentheses	Medium	Solution		Python
1250	Check If It Is a Good Array	Hard
1251	Average Selling Price 🔒	Easy
1252	Cells with Odd Values in a Matrix	Easy			Python
1253	Reconstruct a 2-Row Binary Matrix	Medium			Python
1254	Number of Closed Islands	Medium			Python
1255	Maximum Score Words Formed by Letters	Hard
1256	Encode Number 🔒	Medium
1257	Smallest Common Region 🔒	Medium
1258	Synonymous Sentences 🔒	Medium
1259	Handshakes That Don't Cross 🔒	Hard
1260	Shift 2D Grid	Easy
1261	Find Elements in a Contaminated Binary Tree	Medium
1262	Greatest Sum Divisible by Three	Medium
1263	Minimum Moves to Move a Box to Their Target Location	Hard
1264	Page Recommendations 🔒	Medium
1265	Print Immutable Linked List in Reverse 🔒	Medium
1266	Minimum Time Visiting All Points	Easy
1267	Count Servers that Communicate	Medium
1268	Search Suggestions System	Medium
1269	Number of Ways to Stay in the Same Place After Some Steps	Hard
1270	All People Report to the Given Manager 🔒	Medium
1271	Hexspeak 🔒	Easy	Solution		Python
1272	Remove Interval 🔒	Medium	Solution		Python
1273	Delete Tree Nodes 🔒	Medium	Solution		Python
1274	Number of Ships in a Rectangle 🔒	Hard
1275	Find Winner on a Tic Tac Toe Game	Easy	Solution		Python
1276	Number of Burgers with No Waste of Ingredients	Medium	Solution		Python
1277	Count Square Submatrices with All Ones	Medium	Solution	JavaScript	Python
1278	Palindrome Partitioning III	Hard
1279	Traffic Light Controlled Intersection 🔒	Easy
1280	Students and Examinations 🔒	Easy
1281	Subtract the Product and Sum of Digits of an Integer	Easy	Solution		Python
1282	Group the People Given the Group Size They Belong To	Medium	Solution		Python
1283	Find the Smallest Divisor Given a Threshold	Medium	Solution		Python
1284	Minimum Number of Flips to Convert Binary Matrix to Zero Matrix	Hard
1285	Find the Start and End Number of Continuous Ranges 🔒	Medium
1286	Iterator for Combination	Medium			Python
1287	Element Appearing More Than 25% In Sorted Array	Easy			Python
1288	Remove Covered Intervals	Medium			Python
1289	Minimum Falling Path Sum II	Hard			Python
1290	Convert Binary Number in a Linked List to Integer	Easy			Python
1291	Sequential Digits	Medium			Python
1292	Maximum Side Length of a Square with Sum Less than or Equal to Threshold	Medium		JavaScript	Python
1293	Shortest Path in a Grid with Obstacles Elimination	Hard
1294	Weather Type in Each Country 🔒	Easy
1295	Find Numbers with Even Number of Digits	Easy	Solution		Python
1296	Divide Array in Sets of K Consecutive Numbers	Medium	Solution		Python
1297	Maximum Number of Occurrences of a Substring	Medium	Solution		Python
1298	Maximum Candies You Can Get from Boxes	Hard	Solution		Python
1299	Replace Elements with Greatest Element on Right Side	Easy	Solution		Python
1300	Sum of Mutated Array Closest to Target	Medium	Solution		Python
1301	Number of Paths with Max Score	Hard			Python
1302	Deepest Leaves Sum	Medium	Solution		Python
1303	Find the Team Size 🔒	Easy
1304	Find N Unique Integers Sum up to Zero	Easy			Python
1305	All Elements in Two Binary Search Trees	Medium			Python
1306	Jump Game III	Medium			Python
1307	Verbal Arithmetic Puzzle	Hard			Python
1308	Running Total for Different Genders 🔒	Medium
1309	Decrypt String from Alphabet to Integer Mapping	Easy
1310	XOR Queries of a Subarray	Medium
1311	Get Watched Videos by Your Friends	Medium
1312	Minimum Insertion Steps to Make a String Palindrome	Hard
1313	Decompress Run-Length Encoded List	Easy
1314	Matrix Block Sum	Medium
1315	Sum of Nodes with Even-Valued Grandparent	Medium
1316	Distinct Echo Substrings	Hard
1317	Convert Integer to the Sum of Two No-Zero Integers	Easy
1318	Minimum Flips to Make a OR b Equal to c	Medium
1319	Number of Operations to Make Network Connected	Medium
1320	Minimum Distance to Type a Word Using Two Fingers	Hard
1321	Restaurant Growth 🔒	Medium
1322	Ads Performance 🔒	Easy
1323	Maximum 69 Number	Easy
1324	Print Words Vertically	Medium
1325	Delete Leaves With a Given Value	Medium
1326	Minimum Number of Taps to Open to Water a Garden	Hard
1327	List the Products Ordered in a Period 🔒	Easy
1328	Break a Palindrome	Medium
1329	Sort the Matrix Diagonally	Medium
1330	Reverse Subarray To Maximize Array Value	Hard
1331	Rank Transform of an Array	Easy			Python
1332	Remove Palindromic Subsequences	Easy
1333	Filter Restaurants by Vegan-Friendly, Price and Distance	Medium
1334	Find the City With the Smallest Number of Neighbors at a Threshold Distance	Medium
1335	Minimum Difficulty of a Job Schedule	Hard