Previous Questions

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ID	Questions
1	Two Sum
2	Add Two Numbers
3	Longest Substring Without Repeating Characters
4	Median of Two Sorted Arrays
5	Longest Palindromic Substring
6	Zigzag Conversion
7	Reverse Integer
8	String to Integer (atoi)
9	Palindrome Number
10	Regular Expression Matching
11	Container With Most Water
12	Integer to Roman
13	Roman to Integer
14	Longest Common Prefix
15	3Sum
16	3Sum Closest
17	Letter Combinations of a Phone Number
18	4Sum
19	Remove Nth Node From End of List
20	Valid Parentheses
21	Merge Two Sorted Lists
22	Generate Parentheses
23	Merge k Sorted Lists
24	Swap Nodes in Pairs
25	Reverse Nodes in k-Group
26	Remove Duplicates from Sorted Array
27	Remove Element
28	Find the Index of the First Occurrence in a String
29	Divide Two Integers
30	Substring with Concatenation of All Words
31	Next Permutation
32	Longest Valid Parentheses
33	Search in Rotated Sorted Array
34	Find First and Last Position of Element in Sorted Array
35	Search Insert Position
36	Valid Sudoku
37	Sudoku Solver
38	Count and Say
39	Combination Sum
40	Combination Sum II
41	First Missing Positive
42	Trapping Rain Water
43	Multiply Strings
44	Wildcard Matching
45	Jump Game II
46	Permutations
47	Permutations II
48	Rotate Image
49	Group Anagrams
50	Pow(x, n)
51	N-Queens
52	N-Queens II
53	Maximum Subarray
54	Spiral Matrix
55	Jump Game
56	Merge Intervals
57	Insert Interval
58	Length of Last Word
60	Permutation Sequence
61	Rotate List
62	Unique Paths
63	Unique Paths II
64	Minimum Path Sum
65	Valid Number
66	Plus One
67	Add Binary
68	Text Justification
69	Sqrt(x)
70	Climbing Stairs
71	Simplify Path
72	Edit Distance
73	Set Matrix Zeroes
74	Search a 2D Matrix
75	Sort Colors
76	Minimum Window Substring
77	Combinations
78	Subsets
79	Word Search
80	Remove Duplicates from Sorted Array II
83	Remove Duplicates from Sorted List
84	Largest Rectangle in Histogram
85	Maximal Rectangle
86	Partition List
87	Scramble String
88	Merge Sorted Array
89	Gray Code
90	Subsets II
91	Decode Ways
92	Reverse Linked List II
93	Restore IP Addresses
94	Binary Tree Inorder Traversal
95	Unique Binary Search Trees II
97	Interleaving String
98	Validate Binary Search Tree
99	Recover Binary Search Tree
100	Same Tree
101	Symmetric Tree
102	Binary Tree Level Order Traversal
103	Binary Tree Zigzag Level Order Traversal
104	Maximum Depth of Binary Tree
105	Construct Binary Tree from Preorder and Inorder Traversal
106	Construct Binary Tree from Inorder and Postorder Traversal
109	Convert Sorted List to Binary Search Tree
110	Balanced Binary Tree
111	Minimum Depth of Binary Tree
112	Path Sum
113	Path Sum II
114	Flatten Binary Tree to Linked List
115	Distinct Subsequences
116	Populating Next Right Pointers in Each Node
117	Populating Next Right Pointers in Each Node II
118	Pascal’s Triangle
121	Best Time to Buy and Sell Stock
122	Best Time to Buy and Sell Stock II
123	Best Time to Buy and Sell Stock III
124	Binary Tree Maximum Path Sum
125	Valid Palindrome
126	Word Ladder II
127	Word Ladder
128	Longest Consecutive Sequence
130	Surrounded Regions
131	Palindrome Partitioning
133	Clone Graph
134	Gas Station
135	Candy
136	Single Number
137	Single Number II
138	Copy List with Random Pointer
139	Word Break
140	Word Break II
141	Linked List Cycle
142	Linked List Cycle II
143	Reorder List
144	Binary Tree Preorder Traversal
146	LRU Cache
148	Sort List
149	Max Points on a Line
150	Evaluate Reverse Polish Notation
151	Reverse Words in a String
152	Maximum Product Subarray
153	Find Minimum in Rotated Sorted Array
154	Find Minimum in Rotated Sorted Array II
155	Min Stack
158	Read N Characters Given read4 II - Call Multiple Times
159	Longest Substring with At Most Two Distinct Characters
161	One Edit Distance
162	Find Peak Element
163	Missing Ranges
164	Maximum Gap
166	Fraction to Recurring Decimal
167	Two Sum II - Input Array Is Sorted
168	Excel Sheet Column Title
169	Majority Element
171	Excel Sheet Column Number
173	Binary Search Tree Iterator
175	Combine Two Tables
176	Second Highest Salary
178	Rank Scores
179	Largest Number
181	Employees Earning More Than Their Managers
184	Department Highest Salary
185	Department Top Three Salaries
187	Repeated DNA Sequences
188	Best Time to Buy and Sell Stock IV
189	Rotate Array
190	Reverse Bits
191	Number of 1 Bits
193	Valid Phone Numbers
197	Rising Temperature
198	House Robber
199	Binary Tree Right Side View
200	Number of Islands
201	Bitwise AND of Numbers Range
202	Happy Number
203	Remove Linked List Elements
204	Count Primes
205	Isomorphic Strings
206	Reverse Linked List
207	Course Schedule
208	Implement Trie (Prefix Tree)
209	Minimum Size Subarray Sum
210	Course Schedule II
211	Design Add and Search Words Data Structure
212	Word Search II
213	House Robber II
214	Shortest Palindrome
215	Kth Largest Element in an Array
216	Combination Sum III
217	Contains Duplicate
218	The Skyline Problem
219	Contains Duplicate II
220	Contains Duplicate III
221	Maximal Square
222	Count Complete Tree Nodes
224	Basic Calculator
225	Implement Stack using Queues
226	Invert Binary Tree
227	Basic Calculator II
228	Summary Ranges
229	Majority Element II
230	Kth Smallest Element in a BST
231	Power of Two
233	Number of Digit One
234	Palindrome Linked List
235	Lowest Common Ancestor of a Binary Search Tree
236	Lowest Common Ancestor of a Binary Tree
237	Delete Node in a Linked List
238	Product of Array Except Self
239	Sliding Window Maximum
240	Search a 2D Matrix II
241	Different Ways to Add Parentheses
242	Valid Anagram
244	Shortest Word Distance II
246	Strobogrammatic Number
247	Strobogrammatic Number II
249	Group Shifted Strings
250	Count Univalue Subtrees
251	Flatten 2D Vector
252	Meeting Rooms
253	Meeting Rooms II
257	Binary Tree Paths
258	Add Digits
259	3Sum Smaller
261	Graph Valid Tree
264	Ugly Number II
266	Palindrome Permutation
267	Palindrome Permutation II
268	Missing Number
269	Alien Dictionary
270	Closest Binary Search Tree Value
271	Encode and Decode Strings
272	Closest Binary Search Tree Value II
273	Integer to English Words
274	H-Index
276	Paint Fence
277	Find the Celebrity
278	First Bad Version
279	Perfect Squares
280	Wiggle Sort
281	Zigzag Iterator
282	Expression Add Operators
283	Move Zeroes
284	Peeking Iterator
285	Inorder Successor in BST
286	Walls and Gates
287	Find the Duplicate Number
288	Unique Word Abbreviation
289	Game of Life
292	Nim Game
293	Flip Game
294	Flip Game II
295	Find Median from Data Stream
296	Best Meeting Point
297	Serialize and Deserialize Binary Tree
298	Binary Tree Longest Consecutive Sequence
299	Bulls and Cows
300	Longest Increasing Subsequence
301	Remove Invalid Parentheses
302	Smallest Rectangle Enclosing Black Pixels
304	Range Sum Query 2D - Immutable
305	Number of Islands II
306	Additive Number
307	Range Sum Query - Mutable
308	Range Sum Query 2D - Mutable
309	Best Time to Buy and Sell Stock with Cooldown
310	Minimum Height Trees
312	Burst Balloons
313	Super Ugly Number
314	Binary Tree Vertical Order Traversal
315	Count of Smaller Numbers After Self
316	Remove Duplicate Letters
317	Shortest Distance from All Buildings
318	Maximum Product of Word Lengths
320	Generalized Abbreviation
321	Create Maximum Number
322	Coin Change
323	Number of Connected Components in an Undirected Graph
324	Wiggle Sort II
326	Power of Three
327	Count of Range Sum
328	Odd Even Linked List
329	Longest Increasing Path in a Matrix
330	Patching Array
331	Verify Preorder Serialization of a Binary Tree
332	Reconstruct Itinerary
334	Increasing Triplet Subsequence
336	Palindrome Pairs
337	House Robber III
338	Counting Bits
340	Longest Substring with At Most K Distinct Characters
341	Flatten Nested List Iterator
343	Integer Break
344	Reverse String
345	Reverse Vowels of a String
346	Moving Average from Data Stream
347	Top K Frequent Elements
348	Design Tic-Tac-Toe
349	Intersection of Two Arrays
351	Android Unlock Patterns
353	Design Snake Game
354	Russian Doll Envelopes
355	Design Twitter
356	Line Reflection
357	Count Numbers with Unique Digits
358	Rearrange String k Distance Apart
359	Logger Rate Limiter
360	Sort Transformed Array
361	Bomb Enemy
362	Design Hit Counter
363	Max Sum of Rectangle No Larger Than K
365	Water and Jug Problem
366	Find Leaves of Binary Tree
367	Valid Perfect Square
368	Largest Divisible Subset
369	Plus One Linked List
370	Range Addition
373	Find K Pairs with Smallest Sums
374	Guess Number Higher or Lower
375	Guess Number Higher or Lower II
377	Combination Sum IV
378	Kth Smallest Element in a Sorted Matrix
379	Design Phone Directory
380	Insert Delete GetRandom O(1)
381	Insert Delete GetRandom O(1) - Duplicates allowed
382	Linked List Random Node
383	Ransom Note
384	Shuffle an Array
387	First Unique Character in a String
388	Longest Absolute File Path
389	Find the Difference
391	Perfect Rectangle
392	Is Subsequence
393	UTF-8 Validation
394	Decode String
395	Longest Substring with At Least K Repeating Characters
397	Integer Replacement
398	Random Pick Index
399	Evaluate Division
400	Nth Digit
401	Binary Watch
402	Remove K Digits
403	Frog Jump
404	Sum of Left Leaves
405	Convert a Number to Hexadecimal
406	Queue Reconstruction by Height
407	Trapping Rain Water II
408	Valid Word Abbreviation
409	Longest Palindrome
410	Split Array Largest Sum
411	Minimum Unique Word Abbreviation
412	Fizz Buzz
413	Arithmetic Slices
415	Add Strings
416	Partition Equal Subset Sum
417	Pacific Atlantic Water Flow
418	Sentence Screen Fitting
419	Battleships in a Board
420	Strong Password Checker
421	Maximum XOR of Two Numbers in an Array
422	Valid Word Square
424	Longest Repeating Character Replacement
425	Word Squares
432	All O`one Data Structure
435	Non-overlapping Intervals
437	Path Sum III
438	Find All Anagrams in a String
441	Arranging Coins
442	Find All Duplicates in an Array
443	String Compression
444	Sequence Reconstruction
447	Number of Boomerangs
448	Find All Numbers Disappeared in an Array
450	Delete Node in a BST
451	Sort Characters By Frequency
452	Minimum Number of Arrows to Burst Balloons
454	4Sum II
458	Poor Pigs
459	Repeated Substring Pattern
460	LFU Cache
463	Island Perimeter
465	Optimal Account Balancing
469	Convex Polygon
471	Encode String with Shortest Length
473	Matchsticks to Square
474	Ones and Zeroes
475	Heaters
476	Number Complement
480	Sliding Window Median
481	Magical String
482	License Key Formatting
483	Smallest Good Base
484	Find Permutation
485	Max Consecutive Ones
486	Predict the Winner
487	Max Consecutive Ones II
490	The Maze
493	Reverse Pairs
494	Target Sum
496	Next Greater Element I
498	Diagonal Traverse
499	The Maze III
501	Find Mode in Binary Search Tree
503	Next Greater Element II
505	The Maze II
506	Relative Ranks
507	Perfect Number
510	Count Subarrays With More Ones Than Zeros
511	All Paths from Source Lead to Destination
514	Freedom Trail
516	Longest Palindromic Subsequence
518	Coin Change II
520	Detect Capital
521	Longest Uncommon Subsequence I
522	Longest Uncommon Subsequence II
523	Continuous Subarray Sum
524	Longest Word in Dictionary through Deleting
525	Contiguous Array
526	Beautiful Arrangement
527	Word Abbreviation
530	Minimum Absolute Difference in BST
531	Lonely Pixel I
532	K-diff Pairs in an Array
533	Lonely Pixel II
535	Encode and Decode TinyURL
539	Minimum Time Difference
540	Single Element in a Sorted Array
541	Reverse String II
542	01 Matrix
543	Diameter of Binary Tree
544	Output Contest Matches
545	Boundary of Binary Tree
547	Number of Provinces
549	Binary Tree Longest Consecutive Sequence II
550	Shortest Path to Get Food
551	Student Attendance Record I
552	Student Attendance Record II
554	Brick Wall
556	Next Greater Element III
557	Reverse Words in a String III
560	Subarray Sum Equals K
562	Longest Line of Consecutive One in Matrix
564	Find the Closest Palindrome
567	Permutation in String
568	Maximum Vacation Days
569	Median Employee Salary
572	Subtree of Another Tree
577	Employee Bonus
581	Shortest Unsorted Continuous Subarray
583	Delete Operation for Two Strings
584	Find Customer Referee
586	Customer Placing the Largest Number of Orders
587	Erect the Fence
588	Design In-Memory File System
593	Valid Square
595	Big Countries
604	Design Compressed String Iterator
605	Can Place Flowers
609	Find Duplicate File in System
616	Add Bold Tag in String
621	Task Scheduler
629	K Inverse Pairs Array
630	Course Schedule III
631	Design Excel Sum Formula
632	Smallest Range Covering Elements from K Lists
636	Exclusive Time of Functions
638	Shopping Offers
642	Design Search Autocomplete System
643	Maximum Average Subarray I
644	Maximum Average Subarray II
647	Palindromic Substrings
648	Replace Words
651	4 Keys Keyboard
652	Find Duplicate Subtrees
653	Two Sum IV - Input is a BST
656	Coin Path
657	Robot Return to Origin
658	Find K Closest Elements
659	Split Array into Consecutive Subsequences
662	Maximum Width of Binary Tree
664	Strange Printer
665	Non-decreasing Array
667	Beautiful Arrangement II
668	Kth Smallest Number in Multiplication Table
670	Maximum Swap
673	Number of Longest Increasing Subsequence
674	Longest Continuous Increasing Subsequence
676	Implement Magic Dictionary
678	Valid Parenthesis String
679	24 Game
680	Valid Palindrome II
681	Next Closest Time
683	K Empty Slots
684	Redundant Connection
685	Redundant Connection II
686	Repeated String Match
687	Longest Univalue Path
689	Maximum Sum of 3 Non-Overlapping Subarrays
690	Employee Importance
691	Stickers to Spell Word
692	Top K Frequent Words
695	Max Area of Island
696	Count Binary Substrings
697	Degree of an Array
715	Range Module
718	Maximum Length of Repeated Subarray
719	Find K-th Smallest Pair Distance
720	Longest Word in Dictionary
721	Accounts Merge
722	Remove Comments
724	Find Pivot Index
726	Number of Atoms
727	Minimum Window Subsequence
729	My Calendar I
731	My Calendar II
732	My Calendar III
733	Flood Fill
734	Sentence Similarity
735	Asteroid Collision
737	Sentence Similarity II
739	Daily Temperatures
740	Delete and Earn
741	Cherry Pickup
744	Network Delay Time
746	Prefix and Suffix Search
747	Min Cost Climbing Stairs
748	Largest Number At Least Twice of Others
749	Shortest Completing Word
753	Open the Lock
754	Cracking the Safe
757	Pyramid Transition Matrix
760	Bold Words in String
761	Employee Free Time
762	Find Anagram Mappings
765	Serialize and Deserialize N-ary Tree
766	Flatten a Multilevel Doubly Linked List
768	Partition Labels
770	Couples Holding Hands
772	Construct Quad Tree
775	N-ary Tree Preorder Traversal
777	Toeplitz Matrix
778	Reorganize String
779	Max Chunks To Make Sorted II
780	Max Chunks To Make Sorted
785	Basic Calculator III
786	Search in a Sorted Array of Unknown Size
788	Minimize Max Distance to Gas Station
789	Kth Largest Element in a Stream
791	Split BST
792	Binary Search
793	Swap Adjacent in LR String
794	Swim in Rising Water
795	K-th Symbol in Grammar
796	Reaching Points
798	Transform to Chessboard
799	Minimum Distance Between BST Nodes
801	Is Graph Bipartite?
803	Cheapest Flights Within K Stops
804	Rotated Digits
805	Escape The Ghosts
806	Domino and Tromino Tiling
807	Custom Sort String
808	Number of Matching Subsequences
810	Valid Tic-Tac-Toe State
813	All Paths From Source to Target
815	Champagne Tower
816	Design HashSet
817	Design HashMap
818	Similar RGB Color
820	Find Eventual Safe States
821	Bricks Falling When Hit
822	Unique Morse Code Words
825	Max Increase to Keep City Skyline
826	Soup Servings
827	Expressive Words
830	Largest Triangle Area
831	Largest Sum of Averages
833	Bus Routes
834	Ambiguous Coordinates
835	Linked List Components
836	Race Car
838	Design Linked List
843	Binary Trees With Factors
850	Insert into a Sorted Circular Linked List
854	Making A Large Island
855	Count Unique Characters of All Substrings of a Given String
857	Positions of Large Groups
860	Design Circular Queue
861	Flipping an Image
862	Find And Replace in String
863	Sum of Distances in Tree
864	Image Overlap
865	Robot Room Cleaner
867	New 21 Game
868	Push Dominoes
869	Similar String Groups
870	Magic Squares In Grid
871	Keys and Rooms
873	Guess the Word
874	Backspace String Compare
875	Longest Mountain in Array
876	Hand of Straights
877	Shortest Path Visiting All Nodes
879	Maximize Distance to Closest Person
882	Peak Index in a Mountain Array
883	Car Fleet
884	K-Similar Strings
885	Exam Room
886	Score of Parentheses
887	Minimum Cost to Hire K Workers
889	Buddy Strings
892	Shortest Subarray with Sum at Least K
893	All Nodes Distance K in Binary Tree
894	Random Pick with Blacklist
895	Shortest Path to Get All Keys
900	Reordered Power of 2
902	Minimum Number of Refueling Stops
903	Implement Rand10() Using Rand7()
907	Koko Eating Bananas
908	Middle of the Linked List
911	Profitable Schemes
912	Random Pick with Weight
913	Random Flip Matrix
914	Random Point in Non-overlapping Rectangles
917	Boats to Save People
922	Possible Bipartition
923	Super Egg Drop
925	Construct Binary Tree from Preorder and Postorder Traversal
926	Find and Replace Pattern
930	All Possible Full Binary Trees
932	Monotonic Array
933	Increasing Order Search Tree
936	RLE Iterator
937	Online Stock Span
940	Fruit Into Baskets
942	Super Palindromes
945	Snakes and Ladders
947	Online Election
948	Sort an Array
949	Cat and Mouse
950	X of a Kind in a Deck of Cards
952	Word Subsets
953	Reverse Only Letters
954	Maximum Sum Circular Subarray
955	Complete Binary Tree Inserter
956	Number of Music Playlists
957	Minimum Add to Make Parentheses Valid
960	Minimize Malware Spread
962	Flip String to Monotone Increasing
965	Unique Email Addresses
966	Binary Subarrays With Sum
967	Minimum Falling Path Sum
968	Beautiful Array
969	Number of Recent Calls
971	Shortest Bridge
972	Knight Dialer
975	Range Sum of BST
976	Minimum Area Rectangle
977	Distinct Subsequences II
978	Valid Mountain Array
979	DI String Match
981	Delete Columns to Make Sorted
983	Validate Stack Sequences
984	Most Stones Removed with Same Row or Column
985	Bag of Tokens
986	Largest Time for Given Digits
988	Flip Equivalent Binary Trees
989	Largest Component Size by Common Factor
991	Array of Doubled Pairs
992	Delete Columns to Make Sorted II
998	Check Completeness of a Binary Tree
999	Regions Cut By Slashes
1000	Delete Columns to Make Sorted III
1002	Maximum Width Ramp
1003	Minimum Area Rectangle II
1005	Univalued Binary Tree
1007	Numbers With Same Consecutive Differences
1008	Binary Tree Cameras
1013	Fibonacci Number
1014	K Closest Points to Origin
1016	Subarray Sums Divisible by K
1017	Odd Even Jump
1019	Squares of a Sorted Array
1021	Distribute Coins in Binary Tree
1022	Unique Paths III
1023	Time Based Key-Value Store
1025	Minimum Cost For Tickets
1028	Interval List Intersections
1029	Vertical Order Traversal of a Binary Tree
1030	Smallest String Starting From Leaf
1032	Satisfiability of Equality Equations
1034	Subarrays with K Different Integers
1036	Rotting Oranges
1039	Find the Town Judge
1042	Minimum Cost to Merge Stones
1046	Max Consecutive Ones III
1049	Minimum Domino Rotations For Equal Row
1051	Shortest Way to Form String
1052	Campus Bikes
1054	Complement of Base 10 Integer
1055	Pairs of Songs With Total Durations Divisible by 60
1056	Capacity To Ship Packages Within D Days
1057	Numbers With Repeated Digits
1060	Longest Repeating Substring
1063	Best Sightseeing Pair
1064	Smallest Integer Divisible by K
1065	Binary String With Substrings Representing 1 To N
1067	Campus Bikes II
1069	Confusing Number
1073	Number of Enclaves
1076	Brace Expansion
1077	Confusing Number II
1078	Remove Outermost Parentheses
1080	Camelcase Matching
1081	Video Stitching
1085	The Earliest Moment When Everyone Become Friends
1087	Longest Arithmetic Subsequence
1092	Maximum Difference Between Node and Ancestor
1097	Stream of Characters
1099	Path With Maximum Minimum Value
1101	Parallel Courses
1106	Escape a Large Maze
1112	Find Words That Can Be Formed by Characters
1115	Valid Boomerang
1116	Maximum Level Sum of a Binary Tree
1117	As Far from Land as Possible
1118	Divide Array Into Increasing Sequences
1120	Flower Planting With No Adjacent
1122	Longest Duplicate Substring
1123	Single-Row Keyboard
1124	String Transforms Into Another String
1126	Minimum Cost to Connect Sticks
1127	Last Stone Weight
1128	Remove All Adjacent Duplicates In String
1129	Longest String Chain
1134	Shortest Distance to Target Color
1138	Grumpy Bookstore Owner
1142	Minimum Knight Moves
1144	Optimize Water Distribution in a Village
1145	Number of Submatrices That Sum to Target
1153	Product Sales Analysis I
1156	Occurrences After Bigram
1159	Smallest Subsequence of Distinct Characters
1160	Letter Tile Possibilities
1165	Meeting Scheduler
1167	Minimum Time to Build Blocks
1168	Duplicate Zeros
1169	Largest Values From Labels
1170	Shortest Common Supersequence
1171	Shortest Path in Binary Matrix
1176	Design A Leaderboard
1177	Tree Diameter
1184	Car Pooling
1185	Find in Mountain Array
1188	Brace Expansion II
1192	Divide Chocolate
1196	Filling Bookcase Shelves
1197	Parsing A Boolean Expression
1200	Remove Interval
1203	Print in Order
1205	Defanging an IP Address
1207	Delete Nodes And Return Forest
1210	Mean of Array After Removing Some Elements
1211	Iterator for Combination
1217	Relative Sort Array
1221	Element Appearing More Than 25% In Sorted Array
1222	Remove Covered Intervals
1224	Minimum Falling Path Sum II
1228	Minimum Cost Tree From Leaf Values
1229	Shortest Path with Alternating Colors
1232	Sum of Mutated Array Closest to Target
1238	Alphabet Board Path
1241	Decompress Run-Length Encoded List
1242	Matrix Block Sum
1244	Distinct Echo Substrings
1247	Decrease Elements To Make Array Zigzag
1248	Binary Tree Coloring Game
1249	Snapshot Array
1250	Longest Common Subsequence
1251	Longest Chunked Palindrome Decomposition
1254	Deepest Leaves Sum
1256	Rank Transform of an Array
1257	Rank Transform of a Matrix
1258	Article Views I
1263	Number of Dice Rolls With Target Sum
1267	Remove Zero Sum Consecutive Nodes from Linked List
1273	Compare Strings by Frequency of the Smallest Character
1274	Number of Days Between Two Dates
1275	Validate Binary Tree Nodes
1277	Largest Multiple of Three
1278	Product Price at a Given Date
1286	Constrained Subsequence Sum
1287	Distance Between Bus Stops
1296	Kth Ancestor of a Tree Node
1305	Number of Visible People in a Queue
1308	Smallest String With Swaps
1310	Watering Plants
1319	Unique Number of Occurrences
1324	Where Will the Ball Fall
1325	Path with Maximum Probability
1330	Longest Arithmetic Subsequence of Given Difference
1331	Path with Maximum Gold
1332	Count Vowels Permutation
1335	Maximum Candies Allocated to K Children
1337	Design Skiplist
1350	Remove Sub-Folders from the Filesystem
1352	Maximum Profit in Job Scheduling
1358	Find Positive Integer Solution for a Given Equation
1361	Tiling a Rectangle with the Fewest Squares
1364	Tuple with Same Product
1371	Minimum Remove to Make Valid Parentheses
1374	Leftmost Column with at Least a One
1380	Number of Closed Islands
1381	Maximum Score Words Formed by Letters
1384	Maximum Font to Fit a Sentence in a Screen
1387	Find Elements in a Contaminated Binary Tree
1389	Minimum Moves to Move a Box to Their Target Location
1392	Find the Difference of Two Arrays
1393	Maximum Value of K Coins From Piles
1394	Minimum Path Cost in a Grid
1396	Count Servers that Communicate
1397	Search Suggestions System
1398	Number of Ways to Stay in the Same Place After Some Steps
1400	Find Winner on a Tic Tac Toe Game
1402	Count Square Submatrices with All Ones
1405	All People Report to the Given Manager
1406	Subtract the Product and Sum of Digits of an Integer
1409	Minimum Number of Flips to Convert Binary Matrix to Zero Matrix
1413	Maximum Side Length of a Square with Sum Less than or Equal to Threshold
1414	Shortest Path in a Grid with Obstacles Elimination
1418	Fair Distribution of Cookies
1422	Divide Array in Sets of K Consecutive Numbers
1427	All Elements in Two Binary Search Trees
1428	Jump Game III
1431	All Ancestors of a Node in a Directed Acyclic Graph
1437	Minimum Insertion Steps to Make a String Palindrome
1443	Minimum Distance to Type a Word Using Two Fingers
1447	Jump Game IV
1456	Find the City With the Smallest Number of Neighbors at a Threshold Distance
1461	Count All Valid Pickup and Delivery Options
1463	The K Weakest Rows in a Matrix
1468	Check If N and Its Double Exist
1477	Product of the Last K Numbers
1478	Maximum Number of Events That Can Be Attended
1482	How Many Numbers Are Smaller Than the Current Number
1483	Rank Teams by Votes
1485	Minimum Cost to Make at Least One Valid Path in a Grid
1487	Cinema Seat Allocation
1488	Sort Integers by The Power Value
1489	Pizza With 3n Slices
1492	Time Needed to Inform All Employees
1493	Frog Position After T Seconds
1499	Maximum Performance of a Team
1501	Circle and Rectangle Overlapping
1508	Longest Happy Prefix
1509	Replace Employee ID With The Unique Identifier
1513	Find All Good Strings
1515	Find the Minimum Number of Fibonacci Numbers Whose Sum Is K
1522	Stone Game III
1528	Kids With the Greatest Number of Candies
1537	Maximum Score After Splitting a String
1538	Maximum Points You Can Obtain from Cards
1539	Diagonal Traverse II
1543	Simplified Fractions
1544	Count Good Nodes in Binary Tree
1545	Form Largest Integer With Digits That Add up to Target
1549	Longest Continuous Subarray With Absolute Diff Less Than or Equal to Limit
1552	Build an Array With Stack Operations
1555	Number of Ways of Cutting a Pizza
1557	Check If a String Contains All Binary Codes of Size K
1559	Cherry Pickup II
1562	People Whose List of Favorite Companies Is Not a Subset of Another List
1573	Find Two Non-overlapping Sub-arrays Each With Target Sum
1580	Shuffle the Array
1581	The k Strongest Values in an Array
1582	Design Browser History
1583	Paint House III
1584	Average Salary Excluding the Minimum and Maximum Salary
1587	Parallel Courses II
1603	Running Sum of 1d Array
1605	Minimum Number of Days to Make m Bouquets
1612	Avoid Flood in The City
1615	Range Sum of Sorted Subarray Sums
1616	Minimum Difference Between Largest and Smallest Value in Three Moves
1621	Number of Subsequences That Satisfy the Given Sum Condition
1622	Max Value of Equation
1627	Last Moment Before All Ants Fall Out of a Plank
1628	Count Submatrices With All Ones
1630	Count Odd Numbers in an Interval Range
1632	Number of Good Ways to Split a String
1633	Minimum Number of Increments on Subarrays to Form a Target Array
1635	Number of Good Pairs
1636	Number of Substrings With Only 1s
1646	Kth Missing Positive Number
1649	Maximum Number of Non-Overlapping Subarrays With Sum Equals Target
1650	Find Root of N-Ary Tree
1651	Shuffle String
1653	Number of Good Leaf Nodes Pairs
1655	Move Sub-Tree of N-Ary Tree
1656	Count Good Triplets
1661	Minimum Number of Vertices to Reach All Nodes
1666	Make The String Great
1669	Minimum Cost to Cut a Stick
1676	Minimum Number of Days to Eat N Oranges
1677	Matrix Diagonal Sum
1681	Guess the Majority in a Hidden Array
1684	Find Latest Group of Size M
1687	The Most Similar Path in a Graph
1692	Number of Ways to Reorder Array to Get Same BST
1696	Strange Printer II
1697	Strings Differ by One Character
1701	Remove Max Number of Edges to Keep Graph Fully Traversable
1703	Put Boxes Into the Warehouse I
1704	Special Positions in a Binary Matrix
1707	Check If String Is Transformable With Substring Sort Operations
1710	Find Servers That Handled Most Number of Requests
1711	Find Valid Matrix Given Row and Column Sums
1713	Dot Product of Two Sparse Vectors
1714	Rearrange Spaces Between Words
1715	Split a String Into the Max Number of Unique Substrings
1716	Maximum Non Negative Product in a Matrix
1717	Minimum Cost to Connect Two Groups of Points
1719	Put Boxes Into the Warehouse II
1722	Throne Inheritance
1723	Maximum Number of Achievable Transfer Requests
1727	Cat and Mouse II
1728	Fancy Sequence
1730	Special Array With X Elements Greater Than or Equal X
1733	Maximum Number of Visible Points
1736	Build Binary Expression Tree From Infix Expression
1739	Split Two Strings to Make Palindrome
1741	Sort Array by Increasing Frequency
1744	Number of Ways to Form a Target String Given a Dictionary
1745	Find Nearest Right Node in Binary Tree
1746	Largest Substring Between Two Equal Characters
1750	Check If Two Expression Trees are Equivalent
1752	Arithmetic Subarrays
1753	Path With Minimum Effort
1758	Distribute Repeating Integers
1762	Furthest Building You Can Reach
1765	Merge In Between Linked Lists
1768	Design an Expression Tree With Evaluate Function
1770	Minimum Deletions to Make Character Frequencies Unique
1776	Minimum Operations to Reduce X to Zero
1777	Determine if Two Strings Are Close
1791	Richest Customer Wealth
1792	Find the Most Competitive Subsequence
1796	Correct a Binary Tree
1798	Max Number of K-Sum Pairs
1801	Average Time of Process per Machine
1805	Minimum Adjacent Swaps for K Consecutive Ones
1810	Change the Root of a Binary Tree
1814	Jump Game VI
1815	Checking Existence of Edge Length Limited Paths
1818	Maximum Score From Removing Substrings
1826	Maximum XOR With an Element From Array
1828	Count Ways to Distribute Candies
1829	Maximum Units on a Truck
1832	Minimum Operations to Make a Subsequence
1839	Decode XORed Array
1840	Minimize Hamming Distance After Swap Operations
1845	Largest Submatrix With Rearrangements
1847	Largest Subarray Length K
1858	Latest Time by Replacing Hidden Digits
1859	Change Minimum Characters to Satisfy One of Three Conditions
1860	Find Kth Largest XOR Coordinate Value
1865	Checking Existence of Edge Length Limited Paths II
1873	Longest Nice Substring
1875	Tree of Coprimes
1876	Map of Highest Peak
1878	Check if Array Is Sorted and Rotated
1879	Maximum Score From Removing Stones
1883	Find Distance in a Binary Tree
1890	Sum of Beauty of All Substrings
1894	Merge Strings Alternately
1895	Minimum Number of Operations to Move All Balls to Each Box
1896	Maximum Score from Performing Multiplication Operations
1900	Closest Dessert Cost
1902	Car Fleet II
1903	Design Most Recently Used Queue
1907	Count Pairs With XOR in a Range
1908	Recyclable and Low Fat Products
1912	Number of Restricted Paths From First to Last Node
1914	Find the Subtasks That Did Not Execute
1918	Maximum Score of a Good Subarray
1923	Sentence Similarity III
1924	Maximum Number of Groups Getting Fresh Donuts
1934	Evaluate the Bracket Pairs of a String
1935	Minimum Number of Operations to Reinitialize a Permutation
1939	Queries on Number of Points Inside a Circle
1943	Count Pairs of Equal Substrings With Minimum Difference
1949	Implement Trie II (Prefix Tree)
1950	Sign of the Product of an Array
1951	Find the Winner of the Circular Game
1953	Finding MK Average
1954	Replace All Digits with Characters
1959	Minimum Path Cost in a Hidden Grid
1960	Check if the Sentence Is Pangram
1962	Single-Threaded CPU
1966	Frequency of the Most Frequent Element
1969	Maximum Number of Accepted Invitations
1974	Find Customers With Positive Revenue this Year
1977	Minimum Interval to Include Each Query
1978	Minimum Adjacent Swaps to Reach the Kth Smallest Number
1983	Maximum Population Year
1984	Maximum Distance Between a Pair of Values
1986	Largest Color Value in a Directed Graph
1996	Number of Ways to Rearrange Sticks With K Sticks Visible
2000	Minimum Speed to Arrive on Time
2001	Jump Game VII
2008	Minimum Cost to Change the Final Value of Expression
2009	Longest Word With All Prefixes
2012	Process Tasks Using Servers
2013	Minimum Skips to Arrive at Meeting On Time
2017	Minimum Number of Flips to Make the Binary String Alternating
2018	Minimum Space Wasted From Packaging
2026	Merge Triplets to Form Target Triplet
2028	The Earliest and Latest Rounds Where Players Compete
2029	Minimize Product Sum of Two Arrays
2034	Minimum Absolute Difference Queries
2036	Count Pairs in Two Arrays
2038	Nearest Exit from Entrance in Maze
2044	Number of Wonderful Substrings
2045	Cutting Ribbons
2047	Find a Peak Element II
2048	Build Array from Permutation
2049	Eliminate Maximum Number of Monsters
2050	Count Good Numbers
2055	Describe the Painting
2058	Concatenation of Array
2059	Unique Length-3 Palindromic Subsequences
2061	Painting a Grid With Three Different Colors
2067	Maximum Number of Points with Cost
2069	Kth Smallest Subarray Sum
2071	Longest Common Subsequence Between Sorted Arrays
2074	Erect the Fence II
2079	Delete Duplicate Folders in System
2101	Last Day Where You Can Still Cross
2104	Operations on Tree
2107	Find Unique Binary String
2111	Binary Searchable Numbers in an Unsorted Array
2114	Minimum Number of Work Sessions to Finish the Tasks
2115	Number of Unique Good Subsequences
2117	Find Original Array From Doubled Array
2121	Find if Path Exists in Graph
2123	The Number of Weak Characters in the Game
2132	Convert 1D Array Into 2D Array
2135	Maximum Number of Ways to Partition an Array
2139	Detect Squares
2146	Check if Word Can Be Placed In Crossword
2161	Stock Price Fluctuation
2162	Partition Array Into Two Arrays to Minimize Sum Difference
2176	Parallel Courses III
2181	Smallest Index With Equal Value
2183	Minimum Operations to Convert Number
2193	Count Fertile Pyramids in a Land
2198	Process Restricted Friend Requests
2200	Stamping the Grid
2206	Detonate the Maximum Bombs
2210	Find Target Indices After Sorting Array
2212	Removing Minimum and Maximum From Array
2213	Find All People With Secret
2217	Step-By-Step Directions From a Binary Tree Node to Another
2218	Paths in Maze That Lead to Same Room
2219	Maximum Number of Words Found in Sentences
2220	Find All Possible Recipes from Given Supplies
2221	Check if a Parentheses String Can Be Valid
2226	Rings and Rods
2228	Watering Plants II
2237	Longest Palindrome by Concatenating Two Letter Words
2241	Recover the Original Array
2245	Destroying Asteroids
2246	Maximum Employees to Be Invited to a Meeting
2251	Number of Ways to Divide a Long Corridor
2256	Count Words Obtained After Adding a Letter
2261	All Divisions With the Highest Score of a Binary Array
2264	Minimum Sum of Four Digit Number After Splitting Digits
2265	Partition Array According to Given Pivot
2266	Minimum Cost to Set Cooking Time
2268	Remove All Ones With Row and Column Flips
2270	Find All Lonely Numbers in the Array
2279	Maximum Split of Positive Even Integers
2286	Minimum Time to Remove All Cars Containing Illegal Goods
2290	Removing Minimum Number of Magic Beans
2291	Maximum AND Sum of Array
2292	Counting Words With a Given Prefix
2294	Minimum Time to Complete Trips
2295	Minimum Time to Finish the Race
2297	Amount of New Area Painted Each Day
2306	Create Binary Tree From Descriptions
2311	Minimum White Tiles After Covering With Carpets
2312	Most Frequent Number Following Key In an Array
2314	Remove All Ones With Row and Column Flips II
2320	Find All K-Distant Indices in an Array
2321	Minimum Weighted Subgraph With the Required Paths
2322	Number of Ways to Build Sturdy Brick Wall
2333	Count Number of Rectangles Containing Each Point
2334	Number of Flowers in Full Bloom
2338	Minimum Consecutive Cards to Pick Up
2341	Count Prefixes of a Given String
2344	Escape the Spreading Fire
2345	Minimum Number of Operations to Convert Time
2347	Count Nodes Equal to Average of Subtree
2349	Check if There Is a Valid Parentheses String Path
2350	Find Closest Number to Zero
2352	Design an ATM Machine
2353	Maximum Score of a Node Sequence
2357	Count Integers in Intervals
2359	Maximum White Tiles Covered by a Carpet
2367	Minimum Lines to Represent a Line Chart
2375	Minimum Obstacle Removal to Reach Corner
2377	Check if Number Has Equal Digit Count and Digit Value
2378	Sender With Largest Word Count
2380	Booking Concert Tickets in Groups
2383	Add Two Integers
2385	Count Positions on Street With Required Brightness
2389	Design a Text Editor
2394	Count Subarrays With Score Less Than K
2395	Longest Binary Subsequence Less Than or Equal to K
2396	Design Video Sharing Platform
2399	Minimum Flips in Binary Tree to Get Result
2401	Count Asterisks
2403	Count Unreachable Pairs of Nodes in an Undirected Graph
2413	Smallest Number in Infinite Set
2414	Move Pieces to Obtain a String
2416	Evaluate Boolean Binary Tree
2417	The Latest Time to Catch a Bus
2419	Subarray With Elements Greater Than Varying Threshold
2420	Closest Node to Path in Tree
2427	First Letter to Appear Twice
2432	Number of Zero-Filled Subarrays
2434	Design a Number Container System
2435	Shortest Impossible Sequence of Rolls
2443	Check if There is a Valid Partition For The Array
2447	Merge Similar Items
2448	Count Number of Bad Pairs
2450	Minimum Replacements to Sort the Array
2454	Largest Local Values in a Matrix
2472	Build a Matrix With Conditions
2479	Meeting Rooms III
2481	Strictly Palindromic Number
2485	Finding the Number of Visible Mountains
2489	Sort Array by Moving Items to Empty Space
2494	Sum of Prefix Scores of Strings
2505	Number of Good Paths
2506	Minimize Maximum Value in a Grid
2512	Longest Uploaded Prefix
2513	Number of Pairs Satisfying Inequality
2521	Paths in Matrix Whose Sum Is Divisible by K
2525	Count Number of Distinct Integers After Reverse Operations
2526	Longest Increasing Subsequence II
2528	Number of Valid Clock Times
2536	Determine if Two Events Have Conflict
2538	Minimum Cost to Make Array Equal
2545	Height of Binary Tree After Subtree Removal Queries
2550	Words Within Two Edits of Dictionary
2564	Most Profitable Path in a Tree
2567	Closest Nodes Queries in a Binary Search Tree
2569	Number of Beautiful Partitions
2574	Count Subarrays With Median K
2591	Frog Jump II
2615	Make Number of Distinct Characters Equal
2625	Increment Submatrices by One
2641	Disconnect Path in a Binary Matrix by at Most One Flip
2653	Check if There is a Path With Equal Number of 0’s And 1’s
2687	Lexicographically Smallest Beautiful String
2707	Merge Two 2D Arrays by Summing Values
2716	Prime Subtraction Operation
2732	Counter
2734	Array Prototype Last
2747	Apply Transform Over Each Element in Array
2774	Differences Between Two Objects
2809	Create Hello World Function
2818	Maximum Strictly Increasing Cells in a Matrix
2843	Extract Kth Character From The Rope Tree
2849	Sum of Imbalance Numbers of All Subarrays
2868	Continuous Subarrays
2875	Count Houses in a Circular Street
2891	Maximum Beauty of an Array After Applying Operation
2914	Find the Safest Path in a Grid
2953	Count Pairs of Points With Distance k
3000	Minimum Absolute Difference Between Elements With Constraint
3024	String Transformation
3056	Determine if a Cell Is Reachable at a Given Time
3057	Count K-Subsequences of a String With Maximum Beauty
3058	Maximum Number of K-Divisible Components
3158	Maximum Length of Semi-Decreasing Subarrays
3178	Minimum Increment Operations to Make Array Beautiful
3188	Find Champion I
3189	Find Champion II
3191	Maximum Score After Applying Operations on a Tree
3212	Count the Number of Good Partitions
3218	Find Number of Coins to Place in Tree Nodes
3222	Number of Equal Numbers Blocks
3229	Minimum Cost to Make Array Equalindromic
3241	Divide Array Into Arrays With Max Difference