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Problems

#	Title	Languages
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	Implement strStr()
29	Divide Two Integers
31	Next Permutation
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
59	Spiral Matrix II
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
81	Search in Rotated Sorted Array II
82	Remove Duplicates from Sorted List 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
96	Unique Binary Search Trees
98	Validate 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
107	Binary Tree Level Order Traversal II
108	Convert Sorted Array to Binary Search Tree
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
119	Pascal's Triangle II
120	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
128	Longest Consecutive Sequence
129	Sum Root to Leaf Numbers
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
145	Binary Tree Postorder Traversal
146	LRU Cache
147	Insertion 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
160	Intersection of Two Linked Lists
162	Find Peak Element
164	Maximum Gap
165	Compare Version Numbers
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
172	Factorial Trailing Zeroes
173	Binary Search Tree Iterator
179	Largest Number
187	Repeated DNA Sequences
188	Best Time to Buy and Sell Stock IV
189	Rotate Array
190	Reverse Bits
191	Number of 1 Bits
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
215	Kth Largest Element in an Array
216	Combination Sum III
217	Contains Duplicate
219	Contains Duplicate II
220	Contains Duplicate III
221	Maximal Square
222	Count Complete Tree Nodes
223	Rectangle Area
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
232	Implement Queue using Stacks
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
242	Valid Anagram
257	Binary Tree Paths
258	Add Digits
260	Single Number III
263	Ugly Number
264	Ugly Number II
268	Missing Number
273	Integer to English Words
274	H-Index
275	H-Index II
278	First Bad Version
279	Perfect Squares
282	Expression Add Operators
283	Move Zeroes
284	Peeking Iterator
287	Find the Duplicate Number
289	Game of Life
290	Word Pattern
292	Nim Game
295	Find Median from Data Stream
297	Serialize and Deserialize Binary Tree
299	Bulls and Cows
300	Longest Increasing Subsequence
301	Remove Invalid Parentheses
303	Range Sum Query - Immutable
304	Range Sum Query 2D - Immutable
306	Additive Number
309	Best Time to Buy and Sell Stock with Cooldown
312	Burst Balloons
313	Super Ugly Number
315	Count of Smaller Numbers After Self
316	Remove Duplicate Letters
318	Maximum Product of Word Lengths
319	Bulb Switcher
322	Coin Change
326	Power of Three
327	Count of Range Sum
328	Odd Even Linked List
329	Longest Increasing Path in a Matrix
331	Verify Preorder Serialization of a Binary Tree
332	Reconstruct Itinerary
334	Increasing Triplet Subsequence
337	House Robber III
338	Counting Bits
341	Flatten Nested List Iterator
342	Power of Four
343	Integer Break
344	Reverse String
345	Reverse Vowels of a String
347	Top K Frequent Elements
349	Intersection of Two Arrays
350	Intersection of Two Arrays II
352	Data Stream as Disjoint Intervals
354	Russian Doll Envelopes
355	Design Twitter
357	Count Numbers with Unique Digits
365	Water and Jug Problem
367	Valid Perfect Square
368	Largest Divisible Subset
371	Sum of Two Integers
372	Super Pow
373	Find K Pairs with Smallest Sums
374	Guess Number Higher or Lower
375	Guess Number Higher or Lower II
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
386	Lexicographical Numbers
387	First Unique Character in a String
389	Find the Difference
390	Elimination Game
391	Perfect Rectangle
392	Is Subsequence
393	UTF-8 Validation
394	Decode String
395	Longest Substring with At Least K Repeating Characters
396	Rotate Function
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
409	Longest Palindrome
410	Split Array Largest Sum
412	Fizz Buzz
413	Arithmetic Slices
414	Third Maximum Number
415	Add Strings
416	Partition Equal Subset Sum
417	Pacific Atlantic Water Flow
419	Battleships in a Board
421	Maximum XOR of Two Numbers in an Array
423	Reconstruct Original Digits from English
424	Longest Repeating Character Replacement
427	Construct Quad Tree
429	N-ary Tree Level Order Traversal
430	Flatten a Multilevel Doubly Linked List
432	All O`one Data Structure
433	Minimum Genetic Mutation
434	Number of Segments in a String
435	Non-overlapping Intervals
436	Find Right Interval
437	Path Sum III
438	Find All Anagrams in a String
441	Arranging Coins
442	Find All Duplicates in an Array
443	String Compression
445	Add Two Numbers II
446	Arithmetic Slices II - Subsequence
447	Number of Boomerangs
448	Find All Numbers Disappeared in an Array
449	Serialize and Deserialize BST
450	Delete Node in a BST
451	Sort Characters By Frequency
452	Minimum Number of Arrows to Burst Balloons
453	Minimum Moves to Equal Array Elements
454	4Sum II
455	Assign Cookies
456	132 Pattern
457	Circular Array Loop
459	Repeated Substring Pattern
460	LFU Cache
461	Hamming Distance
462	Minimum Moves to Equal Array Elements II
463	Island Perimeter
464	Can I Win
467	Unique Substrings in Wraparound String
468	Validate IP Address
470	Implement Rand10() Using Rand7()
473	Matchsticks to Square
474	Ones and Zeroes
475	Heaters
476	Number Complement
477	Total Hamming Distance
478	Generate Random Point in a Circle
480	Sliding Window Median
481	Magical String
482	License Key Formatting
483	Smallest Good Base
485	Max Consecutive Ones
486	Predict the Winner
488	Zuma Game
491	Non-decreasing Subsequences
492	Construct the Rectangle
493	Reverse Pairs
494	Target Sum
495	Teemo Attacking
496	Next Greater Element I
497	Random Point in Non-overlapping Rectangles
498	Diagonal Traverse
500	Keyboard Row
501	Find Mode in Binary Search Tree
502	IPO
503	Next Greater Element II
504	Base 7
506	Relative Ranks
507	Perfect Number
508	Most Frequent Subtree Sum
509	Fibonacci Number
513	Find Bottom Left Tree Value
514	Freedom Trail
515	Find Largest Value in Each Tree Row
516	Longest Palindromic Subsequence
518	Coin Change 2
519	Random Flip Matrix
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
528	Random Pick with Weight
529	Minesweeper
530	Minimum Absolute Difference in BST
532	K-diff Pairs in an Array
535	Encode and Decode TinyURL
537	Complex Number Multiplication
538	Convert BST to Greater Tree
539	Minimum Time Difference
540	Single Element in a Sorted Array
541	Reverse String II
542	01 Matrix
543	Diameter of Binary Tree
547	Number of Provinces
551	Student Attendance Record I
552	Student Attendance Record II
553	Optimal Division
554	Brick Wall
556	Next Greater Element III
557	Reverse Words in a String III
558	Quad Tree Intersection
559	Maximum Depth of N-ary Tree
560	Subarray Sum Equals K
561	Array Partition I
563	Binary Tree Tilt
564	Find the Closest Palindrome
565	Array Nesting
566	Reshape the Matrix
567	Permutation in String
572	Subtree of Another Tree
575	Distribute Candies
576	Out of Boundary Paths
581	Shortest Unsorted Continuous Subarray
583	Delete Operation for Two Strings
587	Erect the Fence
589	N-ary Tree Preorder Traversal
590	N-ary Tree Postorder Traversal
591	Tag Validator
592	Fraction Addition and Subtraction
593	Valid Square
594	Longest Harmonious Subsequence
598	Range Addition II
599	Minimum Index Sum of Two Lists
605	Can Place Flowers
606	Construct String from Binary Tree
609	Find Duplicate File in System
611	Valid Triangle Number
617	Merge Two Binary Trees
621	Task Scheduler
622	Design Circular Queue
623	Add One Row to Tree
624	Maximum Distance in Arrays
628	Maximum Product of Three Numbers
629	K Inverse Pairs Array
633	Sum of Square Numbers
636	Exclusive Time of Functions
637	Average of Levels in Binary Tree
638	Shopping Offers
639	Decode Ways II
640	Solve the Equation
641	Design Circular Deque
643	Maximum Average Subarray I
645	Set Mismatch
646	Maximum Length of Pair Chain
647	Palindromic Substrings
648	Replace Words
650	2 Keys Keyboard
652	Find Duplicate Subtrees
653	Two Sum IV - Input is a BST
654	Maximum Binary Tree
655	Print Binary Tree
657	Robot Return to Origin
658	Find K Closest Elements
659	Split Array into Consecutive Subsequences
661	Image Smoother
662	Maximum Width of Binary Tree
665	Non-decreasing Array
668	Kth Smallest Number in Multiplication Table
669	Trim a Binary Search Tree
670	Maximum Swap
671	Second Minimum Node In a Binary Tree
672	Bulb Switcher II
673	Number of Longest Increasing Subsequence
674	Longest Continuous Increasing Subsequence
675	Cut Off Trees for Golf Event
676	Implement Magic Dictionary
677	Map Sum Pairs
679	24 Game
680	Valid Palindrome II
682	Baseball Game
686	Repeated String Match
687	Longest Univalue Path
688	Knight Probability in Chessboard
689	Maximum Sum of 3 Non-Overlapping Subarrays
690	Employee Importance
692	Top K Frequent Words
693	Binary Number with Alternating Bits
695	Max Area of Island
696	Count Binary Substrings
697	Degree of an Array
699	Falling Squares
700	Search in a Binary Search Tree
701	Insert into a Binary Search Tree
703	Kth Largest Element in a Stream
704	Binary Search
705	Design HashSet
706	Design HashMap
707	Design Linked List
709	To Lower Case
710	Random Pick with Blacklist
712	Minimum ASCII Delete Sum for Two Strings
713	Subarray Product Less Than K
714	Best Time to Buy and Sell Stock with Transaction Fee
717	1-bit and 2-bit Characters
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
725	Split Linked List in Parts
728	Self Dividing Numbers
729	My Calendar I
731	My Calendar II
733	Flood Fill
735	Asteroid Collision
738	Monotone Increasing Digits
739	Daily Temperatures
740	Delete and Earn
743	Network Delay Time
744	Find Smallest Letter Greater Than Target
745	Prefix and Suffix Search
746	Min Cost Climbing Stairs
747	Largest Number At Least Twice of Others
748	Shortest Completing Word
752	Open the Lock
754	Reach a Number
757	Set Intersection Size At Least Two
762	Prime Number of Set Bits in Binary Representation
763	Partition Labels
764	Largest Plus Sign
765	Couples Holding Hands
766	Toeplitz Matrix
767	Reorganize String
768	Max Chunks To Make Sorted II
769	Max Chunks To Make Sorted
771	Jewels and Stones
773	Sliding Puzzle
775	Global and Local Inversions
778	Swim in Rising Water
779	K-th Symbol in Grammar
781	Rabbits in Forest
783	Minimum Distance Between BST Nodes
784	Letter Case Permutation
785	Is Graph Bipartite?
786	K-th Smallest Prime Fraction
787	Cheapest Flights Within K Stops
788	Rotated Digits
789	Escape The Ghosts
790	Domino and Tromino Tiling
791	Custom Sort String
792	Number of Matching Subsequences
793	[Preimage Size of Factorial Zeroes Function]
794	Valid Tic-Tac-Toe State
795	Number of Subarrays with Bounded Maximum
796	Rotate String
797	All Paths From Source to Target
798	Smallest Rotation with Highest Score
799	Champagne Tower
801	Minimum Swaps To Make Sequences Increasing
804	Unique Morse Code Words
805	Split Array With Same Average
806	Number of Lines To Write String
807	Max Increase to Keep City Skyline
808	Soup Servings
809	Expressive Words
810	Chalkboard XOR Game
811	Subdomain Visit Count
812	Largest Triangle Area
813	Largest Sum of Averages
814	Binary Tree Pruning
815	Bus Routes
816	Ambiguous Coordinates
817	Linked List Components
819	Most Common Word
820	Short Encoding of Words
821	Shortest Distance to a Character
822	Card Flipping Game
823	Binary Trees With Factors
824	Goat Latin
825	Friends Of Appropriate Ages
826	Most Profit Assigning Work
828	Count Unique Characters of All Substrings of a Given String
829	Consecutive Numbers Sum
830	Positions of Large Groups
831	Masking Personal Information
832	Flipping an Image
833	Find And Replace in String
836	Rectangle Overlap
838	Push Dominoes
839	Similar String Groups
840	Magic Squares In Grid
841	Keys and Rooms
842	Split Array into Fibonacci Sequence
844	Backspace String Compare
845	Longest Mountain in Array
846	Hand of Straights
847	Shortest Path Visiting All Nodes
848	Shifting Letters
849	Maximize Distance to Closest Person
851	Loud and Rich
852	Peak Index in a Mountain Array
853	Car Fleet
855	Exam Room
856	Score of Parentheses
857	Minimum Cost to Hire K Workers
858	Mirror Reflection
859	Buddy Strings
860	Lemonade Change
861	Score After Flipping Matrix
862	Shortest Subarray with Sum at Least K
863	All Nodes Distance K in Binary Tree
865	Smallest Subtree with all the Deepest Nodes
866	Prime Palindrome
867	Transpose Matrix
868	Binary Gap
869	Reordered Power of 2
870	Advantage Shuffle
871	Minimum Number of Refueling Stops
872	Leaf-Similar Trees
873	Length of Longest Fibonacci Subsequence
874	Walking Robot Simulation
875	Koko Eating Bananas
876	Middle of the Linked List
877	Stone Game
878	Nth Magical Number
879	Profitable Schemes
880	Decoded String at Index
881	Boats to Save People
883	Projection Area of 3D Shapes
884	Uncommon Words from Two Sentences
885	Spiral Matrix III
888	Fair Candy Swap
889	Construct Binary Tree from Preorder and Postorder Traversal
890	Find and Replace Pattern
891	Sum of Subsequence Widths
892	Surface Area of 3D Shapes
893	Groups of Special-Equivalent Strings
894	All Possible Full Binary Trees
895	Maximum Frequency Stack
896	Monotonic Array
897	Increasing Order Search Tree
899	Orderly Queue
900	RLE Iterator
901	Online Stock Span
902	Numbers At Most N Given Digit Set
904	Fruit Into Baskets
905	Sort Array By Parity
907	Sum of Subarray Minimums
908	Smallest Range I
909	Snakes and Ladders
910	Smallest Range II
911	Online Election
912	Sort an Array
914	X of a Kind in a Deck of Cards
915	Partition Array into Disjoint Intervals
916	Word Subsets
917	Reverse Only Letters
918	Maximum Sum Circular Subarray
919	Complete Binary Tree Inserter
920	Number of Music Playlists
921	Minimum Add to Make Parentheses Valid
922	Sort Array By Parity II
923	3Sum With Multiplicity
924	Minimize Malware Spread
925	Long Pressed Name
926	Flip String to Monotone Increasing
927	Three Equal Parts
929	Unique Email Addresses
930	Binary Subarrays With Sum
931	Minimum Falling Path Sum
933	Number of Recent Calls
934	Shortest Bridge
935	Knight Dialer
937	Reorder Data in Log Files
938	Range Sum of BST
939	Minimum Area Rectangle
941	Valid Mountain Array
942	DI String Match
944	Delete Columns to Make Sorted
945	Minimum Increment to Make Array Unique
946	Validate Stack Sequences
948	Bag of Tokens
949	Largest Time for Given Digits
950	Reveal Cards In Increasing Order
951	Flip Equivalent Binary Trees
953	Verifying an Alien Dictionary
954	Array of Doubled Pairs
956	Tallest Billboard
957	Prison Cells After N Days
958	Check Completeness of a Binary Tree
961	N-Repeated Element in Size 2N Array
962	Maximum Width Ramp
963	Minimum Area Rectangle II
965	Univalued Binary Tree
966	Vowel Spellchecker
967	Numbers With Same Consecutive Differences
968	Binary Tree Cameras
969	Pancake Sorting
970	Powerful Integers
971	Flip Binary Tree To Match Preorder Traversal
973	K Closest Points to Origin
974	Subarray Sums Divisible by K
975	Odd Even Jump
976	Largest Perimeter Triangle
977	Squares of a Sorted Array
978	Longest Turbulent Subarray
979	Distribute Coins in Binary Tree
980	Unique Paths III
981	Time Based Key-Value Store
982	Triples with Bitwise AND Equal To Zero
983	Minimum Cost For Tickets
984	String Without AAA or BBB
985	Sum of Even Numbers After Queries
986	Interval List Intersections
987	Vertical Order Traversal of a Binary Tree
988	Smallest String Starting From Leaf
989	Add to Array-Form of Interger
990	Satisfiability of Equality Equations
991	Broken Calculator
993	Cousins in Binary Tree
994	Rotting Oranges
996	Number of Squareful Arrays
997	Find the Town Judge
998	Maximum Binary Tree II
999	Available Captures for Rook
1001	Grid Illumination
1002	Find Common Characters
1003	Check If Word Is Valid After Substitutions
1004	Max Consecutive Ones III
1005	Maximize Sum Of Array After K Negations
1006	Clumsy Factorial
1007	Minimum Domino Rotations For Equal Row
1008	Construct Binary Search Tree from Preorder Traversal
1009	Complement of Base 10 Integer
1010	Pairs of Songs With Total Durations Divisible by 60
1011	Capacity To Ship Packages Within D Days
1012	Numbers With Repeated Digits
1013	Partition Array Into Three Parts With Equal Sum
1014	Best Sightseeing Pair
1015	Smallest Integer Divisible by K
1016	Binary String With Substrings Representing 1 To N
1017	Convert to Base -2
1018	Binary Prefix Divisible By 5
1019	Next Greater Node In Linked List
1020	Number of Enclaves
1021	Remove Outermost Parentheses
1022	Sum of Root To Leaf Binary Numbers
1023	Camelcase Matching
1024	Video Stitching
1025	Divisor Game
1026	Maximum Difference Between Node and Ancestor
1027	Longest Arithmetic Subsequence
1028	Recover a Tree From Preorder Traversal
1029	Two City Scheduling
1030	Matrix Cells in Distance Order
1031	Maximum Sum of Two Non-Overlapping Subarrays
1033	Moving Stones Until Consecutive
1034	Coloring A Border
1035	Uncrossed Lines
1037	Valid Boomerang
1038	Binary Search Tree to Greater Sum Tree
1039	Minimum Score Triangulation of Polygon
1040	Moving Stones Until Consecutive II
1041	Robot Bounded In Circle
1042	Flower Planting With No Adjacent
1043	Partition Array for Maximum Sum
1046	Last Stone Weight
1047	Remove All Adjacent Duplicates In String
1048	Longest String Chain
1051	Height Checker
1052	Grumpy Bookstore Owner
1053	Previous Permutation With One Swap
1054	Distant Barcodes
1061	Lexicographically Smallest Equivalent String
1071	Greatest Common Divisor of Strings
1073	Adding Two Negabinary Numbers
1074	Number of Submatrices That Sum to Target
1078	Occurrences After Bigram
1079	Letter Tile Possibilities
1080	Insufficient Nodes in Root to Leaf Paths
1081	Smallest Subsequence of Distinct Characters
1089	Duplicate Zeros
1090	Largest Values From Labels
1091	Shortest Path in Binary Matrix
1093	Statistics from a Large Sample
1094	Car Pooling
1095	Find in Mountain Array
1103	Distribute Candies to People
1104	Path In Zigzag Labelled Binary Tree
1105	Filling Bookcase Shelves
1106	Parsing A Boolean Expression
1108	Defanging an IP Address
1109	Corporate Flight Bookings
1110	Delete Nodes And Return Forest
1111	Maximum Nesting Depth of Two Valid Parentheses Strings
1122	Relative Sort Array
1123	Lowest Common Ancestor of Deepest Leaves
1124	Longest Well-Performing Interval
1125	Smallest Sufficient Team
1128	Number of Equivalent Domino Pairs
1129	Shortest Path with Alternating Colors
1130	Minimum Cost Tree From Leaf Values
1131	Maximum of Absolute Value Expression
1137	N-th Tribonacci Number
1138	Alphabet Board Path
1139	Largest 1-Bordered Square
1140	Stone Game II
1143	Longest Common Subsequence
1144	Decrease Elements To Make Array Zigzag
1145	Binary Tree Coloring Game
1146	Snapshot Array
1154	Day of the Year
1155	Number of Dice Rolls With Target Sum
1156	Swap For Longest Repeated Character Substring
1160	Find Words That Can Be Formed by Characters
1161	Maximum Level Sum of a Binary Tree
1162	As Far from Land as Possible
1169	invalid-transactions
1170	Compare Strings by Frequency of the Smallest Character
1171	Remove Zero Sum Consecutive Nodes from Linked List
1172	Dinner Plate Stacks
1175	Prime Arrangements
1177	Can Make Palindrome from Substring
1178	Number of Valid Words for Each Puzzle
1184	Distance Between Bus Stops
1185	Day of the Week
1187	Make Array Strictly Increasing
1189	Maximum Number of Balloons
1190	Reverse Substrings Between Each Pair of Parentheses
1191	K-Concatenation Maximum Sum
1200	Minimum Absolute Difference
1201	Ugly Number III
1202	Smallest String With Swaps
1206	Design Skiplist
1207	Unique Number of Occurrences
1208	Get Equal Substrings Within Budget
1209	Remove All Adjacent Duplicates in String II
1210	Minimum Moves to Reach Target with Rotations
1217	Play with Chips
1218	Longest Arithmetic Subsequence of Given Difference
1219	Path with Maximum Gold
1220	Count Vowels Permutation
1221	Split a String in Balanced Strings
1222	Queens That Can Attack the King
1223	Dice Roll Simulation
1224	Maximum Equal Frequency
1227	Airplane Seat Assignment Probability
1232	Check If It Is a Straight Line
1233	Remove Sub-Folders from the Filesystem
1234	Replace the Substring for Balanced String
1235	Maximum Profit in Job Scheduling
1237	Find Positive Integer Solution for a Given Equation
1238	Circular Permutation in Binary Representation
1239	Maximum Length of a Concatenated String with Unique Characters
1247	Minimum Swaps to Make Strings Equal
1248	Count Number of Nice Subarrays
1249	Minimum Remove to Make Valid Parentheses
1250	Check If It Is a Good Array
1252	Cells with Odd Values in a Matrix
1253	Reconstruct a 2-Row Binary Matrix
1255	Maximum Score Words Formed by Letters
1260	Shift 2D Grid
1261	Find Elements in a Contaminated Binary Tree
1262	Greatest Sum Divisible by Three
1263	Minimum Moves to Move a Box to Their Target Location
1266	Minimum Time Visiting All Points
1267	Count Servers that Communicate
1268	Search Suggestions System
1269	Number of Ways to Stay in the Same Place After Some Steps
1275	Find Winner on a Tic Tac Toe Game
1276	Number of Burgers with No Waste of Ingredients
1277	Count Square Submatrices with All Ones
1278	Palindrome Partitioning III
1281	Subtract the Product and Sum of Digits of an Integer
1282	Group the People Given the Group Size They Belong To
1283	Find the Smallest Divisor Given a Threshold
1284	Minimum Number of Flips to Convert Binary Matrix to Zero Matrix
1286	Iterator for Combination
1287	Element Appearing More Than 25% In Sorted Array
1288	Remove Covered Intervals
1289	Minimum Falling Path Sum II
1290	Convert Binary Number in a Linked List to Integer
1291	Sequential Digits
1292	Maximum Side Length of a Square with Sum Less than or Equal to Threshold
1293	Shortest Path in a Grid with Obstacles Elimination
1295	Find Numbers with Even Number of Digits
1296	Divide Array in Sets of K Consecutive Numbers
1297	Maximum Number of Occurrences of a Substring
1298	Maximum Candies You Can Get from Boxes
1299	Replace Elements with Greatest Element on Right Side
1300	Sum of Mutated Array Closest to Target
1301	Number of Paths with Max Score
1302	Deepest Leaves Sum
1304	Find N Unique Integers Sum up to Zero
1305	All Elements in Two Binary Search Trees
1306	Jump Game III
1309	Decrypt String from Alphabet to Integer Mapping
1310	XOR Queries of a Subarray
1311	Get Watched Videos by Your Friends
1312	Minimum Insertion Steps to Make a String Palindrome
1313	Decompress Run-Length Encoded List
1314	Matrix Block Sum
1315	Sum of Nodes with Even-Valued Grandparent
1316	Distinct Echo Substrings
1317	Convert Integer to the Sum of Two No-Zero Integers
1318	Minimum Flips to Make a OR b Equal to c
1319	Number of Operations to Make Network Connected
1320	Minimum Distance to Type a Word Using Two Fingers
1323	Maximum 69 Number
1324	Print Words Vertically
1325	Delete Leaves With a Given Value
1328	Break a Palindrome
1329	Sort the Matrix Diagonally
1330	Reverse Subarray To Maximize Array Value
1331	Rank Transform of an Array
1332	Remove Palindromic Subsequences
1333	Filter Restaurants by Vegan-Friendly, Price and Distance
1334	Find the City With the Smallest Number of Neighbors at a Threshold Distance
1335	Minimum Difficulty of a Job Schedule
1337	The K Weakest Rows in a Matrix
1338	Reduce Array Size to The Half
1339	Maximum Product of Splitted Binary Tree
1340	Jump Game V
1342	Number of Steps to Reduce a Number to Zero
1343	Number of Sub-arrays of Size K and Average Greater than or Equal to Threshold
1344	Angle Between Hands of a Clock
1346	Check If N and Its Double Exist
1347	Minimum Number of Steps to Make Two Strings Anagram
1348	Tweet Counts Per Frequency
1349	Maximum Students Taking Exam
1351	Count Negative Numbers in a Sorted Matrix
1352	Product of the Last K Numbers
1353	Maximum Number of Events That Can Be Attended
1356	Sort Integers by The Number of 1 Bits
1357	Apply Discount Every n Orders
1358	Number of Substrings Containing All Three Characters
1359	Count All Valid Pickup and Delivery Options
1360	Number of Days Between Two Dates
1361	Validate Binary Tree Nodes
1362	Closest Divisors
1363	Largest Multiple of Three
1365	How Many Numbers Are Smaller Than the Current Number
1366	Rank Teams by Votes
1367	Linked List in Binary Tree
1368	Minimum Cost to Make at Least One Valid Path in a Grid
1370	Increasing Decreasing String
1371	Find the Longest Substring Containing Vowels in Even Counts
1372	Longest ZigZag Path in a Binary Tree
1373	Maximum Sum BST in Binary Tree
1374	Generate a String With Characters That Have Odd Counts
1375	Bulb Switcher III
1376	Time Needed to Inform All Employees
1377	Frog Position After T Seconds
1379	Find a Corresponding Node of a Binary Tree in a Clone of That Tree
1380	Lucky Numbers in a Matrix
1381	Design a Stack With Increment Operation
1382	Balance a Binary Search Tree
1383	Maximum Performance of a Team
1385	Find the Distance Value Between Two Arrays
1386	Cinema Seat Allocation
1387	Sort Integers by The Power Value
1389	Create Target Array in the Given Order
1390	Four Divisors
1391	Check if There is a Valid Path in a Grid
1394	Find Lucky Integer in an Array
1395	Count Number of Teams
1396	Design Underground System
1399	Count Largest Group
1400	Construct K Palindrome Strings
1401	Circle and Rectangle Overlapping
1402	Reducing Dishes
1403	Minimum Subsequence in Non-Increasing Order
1404	Number of Steps to Reduce a Number in Binary Representation to One
1405	Longest Happy String
1406	Stone Game III
1408	String Matching in an Array
1409	Queries on a Permutation With Key
1410	HTML Entity Parser
1411	Number of Ways to Paint N × 3 Grid
1413	Minimum Value to Get Positive Step by Step Sum
1414	Find the Minimum Number of Fibonacci Numbers Whose Sum Is K
1415	The k-th Lexicographical String of All Happy Strings of Length n
1416	Restore The Array
1417	Reformat The String
1418	Display Table of Food Orders in a Restaurant
1419	Minimum Number of Frogs Croaking
1420	Build Array Where You Can Find The Maximum Exactly K Comparisons
1422	Maximum Score After Splitting a String
1423	Maximum Points You Can Obtain from Cards
1424	Diagonal Traverse II
1425	Constrained Subsequence Sum
1431	Kids With the Greatest Number of Candies
1432	Max Difference You Can Get From Changing an Integer
1433	Check If a String Can Break Another String
1434	Number of Ways to Wear Different Hats to Each Other
1436	Destination City
1437	Check If All 1's Are at Least Length K Places Away
1438	Longest Continuous Subarray With Absolute Diff Less Than or Equal to Limit
1439	Find the Kth Smallest Sum of a Matrix With Sorted Rows
1441	Build an Array With Stack Operations
1443	Minimum Time to Collect All Apples in a Tree
1444	Number of Ways of Cutting a Pizza
1446	Consecutive Characters
1447	Simplified Fractions
1448	Count Good Nodes in Binary Tree
1449	Form Largest Integer With Digits That Add up to Target
1450	Number of Students Doing Homework at a Given Time
1451	Rearrange Words in a Sentence
1452	People Whose List of Favorite Companies Is Not a Subset of Another List
1455	Check If a Word Occurs As a Prefix of Any Word in a Sentence
1456	Maximum Number of Vowels in a Substring of Given Length
1457	Pseudo-Palindromic Paths in a Binary Tree
1458	Max Dot Product of Two Subsequences
1460	Make Two Arrays Equal by Reversing Sub-arrays
1461	Check If a String Contains All Binary Codes of Size K
1462	Course Schedule IV
1463	Cherry Pickup II
1464	Maximum Product of Two Elements in an Array
1465	Maximum Area of a Piece of Cake After Horizontal and Vertical Cuts
1467	Probability of a Two Boxes Having The Same Number of Distinct Balls
1470	Shuffle the Array
1471	The k Strongest Values in an Array
1472	Design Browser History
1473	Paint House III
1475	Final Prices With a Special Discount in a Shop
1476	Subrectangle Queries
1477	Find Two Non-overlapping Sub-arrays Each With Target Sum
1480	Running Sum of 1d Array
1481	Least Number of Unique Integers after K Removals
1482	Minimum Number of Days to Make m Bouquets
1486	XOR Operation in an Array
1487	Making File Names Unique
1488	Avoid Flood in The City
1491	Average Salary Excluding the Minimum and Maximum Salary
1492	The kth Factor of n
1493	Longest Subarray of 1's After Deleting One Element
1496	Path Crossing
1497	Check If Array Pairs Are Divisible by k
1498	Number of Subsequences That Satisfy the Given Sum Condition
1499	Max Value of Equation
1502	Can Make Arithmetic Progression From Sequence
1503	Last Moment Before All Ants Fall Out of a Plank
1504	Count Submatrices With All Ones
1507	Reformat Date
1508	Range Sum of Sorted Subarray Sums
1509	Minimum Difference Between Largest and Smallest Value in Three Moves
1510	Stone Game IV
1512	Number of Good Pairs
1513	Number of Substrings With Only 1s
1514	Path with Maximum Probability
1518	Water Bottles
1519	Number of Nodes in the Sub-Tree With the Same Label
1521	Find a Value of a Mysterious Function Closest to Target
1523	Count Odd Numbers in an Interval Range
1524	Number of Sub-arrays With Odd Sum
1525	Number of Good Ways to Split a String
1528	Shuffle String
1529	Bulb Switcher IV
1530	Number of Good Leaf Nodes Pairs
1534	Count Good Triplets
1535	Find the Winner of an Array Game
1537	Get the Maximum Score
1539	Kth Missing Positive Number
1540	Can Convert String in K Moves
1542	Find Longest Awesome Substring
1544	Make The String Great
1545	Find Kth Bit in Nth Binary String
1546	Maximum Number of Non-Overlapping Subarrays With Sum Equals Target
1547	Minimum Cost to Cut a Stick
1550	Three Consecutive Odds
1551	Minimum Operations to Make Array Equal
1552	Magnetic Force Between Two Balls
1553	Minimum Number of Days to Eat N Oranges
1556	Thousand Separator
1557	Minimum Number of Vertices to Reach All Nodes
1558	Minimum Numbers of Function Calls to Make Target Array
1560	Most Visited Sector in a Circular Track
1561	Maximum Number of Coins You Can Get
1562	Find Latest Group of Size M
1563	Stone Game V
1566	Detect Pattern of Length M Repeated K or More Times
1567	Maximum Length of Subarray With Positive Product
1569	Number of Ways to Reorder Array to Get Same BST
1572	Matrix Diagonal Sum
1573	Number of Ways to Split a String
1574	Shortest Subarray to be Removed to Make Array Sorted
1575	Count All Possible Routes
1576	Replace All ?'s to Avoid Consecutive Repeating Characters
1577	Number of Ways Where Square of Number Is Equal to Product of Two Numbers
1578	Minimum Time to Make Rope Colorful
1582	Special Positions in a Binary Matrix
1588	Sum of All Odd Length Subarrays
1589	Maximum Sum Obtained of Any Permutation
1590	Make Sum Divisible by P
1592	Rearrange Spaces Between Words
1593	Split a String Into the Max Number of Unique Substrings
1594	Maximum Non Negative Product in a Matrix
1598	Crawler Log Folder
1599	Maximum Profit of Operating a Centennial Wheel
1600	Throne Inheritance
1601	Maximum Number of Achievable Transfer Requests
1603	Design Parking System
1604	Alert Using Same Key-Card Three or More Times in a One Hour Period
1605	Find Valid Matrix Given Row and Column Sums
1606	Find Servers That Handled Most Number of Requests
1608	Special Array With X Elements Greater Than or Equal X
1609	Even Odd Tree
1610	Maximum Number of Visible Points
1611	Minimum One Bit Operations to Make Integers Zero
1614	Maximum Nesting Depth of the Parentheses
1615	Maximal Network Rank
1616	Split Two Strings to Make Palindrome
1619	Mean of Array After Removing Some Elements
1620	Coordinate With Maximum Network Quality
1621	Number of Sets of K Non-Overlapping Line Segments
1622	Fancy Sequence
1624	Largest Substring Between Two Equal Characters
1629	Slowest Key
1630	Arithmetic Subarrays
1631	Path With Minimum Effort
1632	Rank Transform of a Matrix
1636	Sort Array by Increasing Frequency
1637	Widest Vertical Area Between Two Points Containing No Points
1638	Count Substrings That Differ by One Character
1639	Number of Ways to Form a Target String Given a Dictionary
1640	Check Array Formation Through Concatenation
1641	Count Sorted Vowel Strings
1642	Furthest Building You Can Reach
1643	Kth Smallest Instructions
1646	Get Maximum in Generated Array
1647	Minimum Deletions to Make Character Frequencies Unique
1648	Sell Diminishing-Valued Colored Balls
1649	Create Sorted Array through Instructions
1652	Defuse the Bomb
1653	Minimum Deletions to Make String Balanced
1654	Minimum Jumps to Reach Home
1655	Distribute Repeating Integers
1656	Design an Ordered Stream
1657	Determine if Two Strings Are Close
1658	Minimum Operations to Reduce X to Zero
1662	Check If Two String Arrays are Equivalent
1663	Smallest String With A Given Numeric Value
1664	Ways to Make a Fair Array
1668	Maximum Repeating Substring
1669	Merge In Between Linked Lists
1670	Design Front Middle Back Queue
1672	Richest Customer Wealth
1673	Find the Most Competitive Subsequence
1678	Goal Parser Interpretation
1679	Max Number of K-Sum Pairs
1684	Count the Number of Consistent Strings
1685	Sum of Absolute Differences in a Sorted Array
1686	Stone Game VI
1688	Count of Matches in Tournament
1689	Partitioning Into Minimum Number Of Deci-Binary Numbers
1690	Stone Game VII
1694	Reformat Phone Number
1695	Maximum Erasure Value
1696	Jump Game VI
1700	Number of Students Unable to Eat Lunch
1701	Average Waiting Time
1702	Maximum Binary String After Change
1703	Minimum Adjacent Swaps for K Consecutive Ones
1704	Determine if String Halves Are Alike
1705	Maximum Number of Eaten Apples
1706	Where Will the Ball Fall
1710	Maximum Units on a Truck
1711	Count Good Meals
1712	Ways to Split Array Into Three Subarrays
1713	Minimum Operations to Make a Subsequence
1716	Calculate Money in Leetcode Bank
1718	Construct the Lexicographically Largest Valid Sequence
1720	Decode XORed Array
1721	Swapping Nodes in a Linked List
1722	Minimize Hamming Distance After Swap Operations
1723	Find Minimum Time to Finish All Jobs
1725	Number Of Rectangles That Can Form The Largest Square
1726	Tuple with Same Product
1732	Find the Highest Altitude
1733	Minimum Number of People to Teach
1734	Decode XORed Permutation
1736	Latest Time by Replacing Hidden Digits
1737	Change Minimum Characters to Satisfy One of Three Conditions
1738	Find Kth Largest XOR Coordinate Value
1739	Building Boxes
1742	Maximum Number of Balls in a Box
1743	Restore the Array From Adjacent Pairs
1744	Can You Eat Your Favorite Candy on Your Favorite Day?
1745	Palindrome Partitioning IV
1748	Sum of Unique Elements
1749	Maximum Absolute Sum of Any Subarray
1750	Minimum Length of String After Deleting Similar Ends
1751	Maximum Number of Events That Can Be Attended II
1752	Check if Array Is Sorted and Rotated
1753	Maximum Score From Removing Stones
1754	Largest Merge Of Two Strings
1758	Minimum Changes To Make Alternating Binary String
1759	Count Number of Homogenous Substrings
1760	Minimum Limit of Balls in a Bag
1761	Minimum Degree of a Connected Trio in a Graph
1763	Longest Nice Substring
1764	Form Array by Concatenating Subarrays of Another Array
1765	Map of Highest Peak
1768	Merge Strings Alternately
1769	Minimum Number of Operations to Move All Balls to Each Box
1770	Maximum Score from Performing Multiplication Operations
1771	Maximize Palindrome Length From Subsequences
1773	Count Items Matching a Rule
1774	Closest Dessert Cost
1775	Equal Sum Arrays With Minimum Number of Operations
1779	Find Nearest Point That Has the Same X or Y Coordinate
1780	Check if Number is a Sum of Powers of Three
1781	Sum of Beauty of All Substrings
1784	Check if Binary String Has at Most One Segment of Ones
1785	Minimum Elements to Add to Form a Given Sum
1790	Check if One String Swap Can Make Strings Equal
1791	Find Center of Star Graph
1792	Maximum Average Pass Ratio
1793	Maximum Score of a Good Subarray
1796	Second Largest Digit in a String
1797	Design Authentication Manager
1798	Maximum Number of Consecutive Values You Can Make
1799	Maximize Score After N Operations
1800	Maximum Ascending Subarray Sum
1801	Number of Orders in the Backlog
1802	Maximum Value at a Given Index in a Bounded Array
1805	Number of Different Integers in a String
1806	Minimum Number of Operations to Reinitialize a Permutation
1807	Evaluate the Bracket Pairs of a String
1808	Maximize Number of Nice Divisors
1812	Determine Color of a Chessboard Square
1813	Sentence Similarity III
1814	Count Nice Pairs in an Array
1816	Truncate Sentence
1817	Finding the Users Active Minutes
1818	Minimum Absolute Sum Difference
1822	Sign of the Product of an Array
1823	Find the Winner of the Circular Game
1824	Minimum Sideway Jumps
1825	Finding MK Average
1827	Minimum Operations to Make the Array Increasing
1828	Queries on Number of Points Inside a Circle
1829	Maximum XOR for Each Query
1832	Check if the Sentence Is Pangram
1833	Maximum Ice Cream Bars
1834	Single-Threaded CPU
1835	Find XOR Sum of All Pairs Bitwise AND
1837	Sum of Digits in Base K
1838	Frequency of the Most Frequent Element
1839	Longest Substring Of All Vowels in Order
1840	Maximum Building Height
1844	Replace All Digits with Characters
1845	Seat Reservation Manager
1846	Maximum Element After Decreasing and Rearranging
1847	Closest Room
1848	Minimum Distance to the Target Element
1849	Splitting a String Into Descending Consecutive Values
1851	Minimum Interval to Include Each Query
1854	Maximum Population Year
1855	Maximum Distance Between a Pair of Values
1856	Maximum Subarray Min-Product
1857	Largest Color Value in a Directed Graph
1859	Sorting the Sentence
1860	Incremental Memory Leak
1861	Rotating the Box
1862	Sum of Floored Pairs
1863	Sum of All Subset XOR Totals
1864	Minimum Number of Swaps to Make the Binary String Alternating
1865	Finding Pairs With a Certain Sum
1866	Number of Ways to Rearrange Sticks With K Sticks Visible
1869	Longer Contiguous Segments of Ones than Zeros
1870	Minimum Speed to Arrive on Time
1871	Jump Game VII
1872	Stone Game VIII
1876	Substrings of Size Three with Distinct Characters
1877	Minimize Maximum Pair Sum in Array
1878	Get Biggest Three Rhombus Sums in a Grid
1880	Check if Word Equals Summation of Two Words
1881	Maximum Value after Insertion
1882	Process Tasks Using Servers
1883	Minimum Skips to Arrive at Meeting On Time
1884	Egg Drop With 2 Eggs and N Floors
1886	Determine Whether Matrix Can Be Obtained By Rotation
1887	Reduction Operations to Make the Array Elements Equal
1888	Minimum Number of Flips to Make the Binary String Alternating
1889	Minimum Space Wasted From Packaging
1893	Check if All the Integers in a Range Are Covered
1894	Find the Student that Will Replace the Chalk
1897	Redistribute Characters to Make All Strings Equal
1898	Maximum Number of Removable Characters
1899	Merge Triplets to Form Target Triplet
1900	The Earliest and Latest Rounds Where Players Compete
1901	Find a Peak Element II
1903	Largest Odd Number in String
1904	The Number of Full Rounds You Have Played
1905	Count Sub Islands
1909	Remove One Element to Make the Array Strictly Increasing
1911	Maximum Alternating Subsequence Sum
1912	Design Movie Rental System
1913	Maximum Product Difference Between Two Pairs
1915	Number of Wonderful Substrings
1916	Count Ways to Build Rooms in an Ant Colony
1920	Build Array from Permutation
1921	Eliminate Maximum Number of Monsters
1922	Count Good Numbers
1925	Count Square Sum Triples
1926	Nearest Exit from Entrance in Maze
1927	Sum Game
1928	Minimum Cost to Reach Destination in Time
1929	Concatenation of Array
1930	Unique Length-3 Palindromic Subsequences
1931	Painting a Grid With Three Different Colors
1932	Merge BSTs to Create Single BST
1935	Maximum Number of Words You Can Type
1936	Add Minimum Number of Rungs
1941	Check if All Characters Have Equal Number of Occurrences
1942	The Number of the Smallest Unoccupied Chair
1944	Number of Visible People in a Queue
1945	Sum of Digits of String After Convert
1946	Largest Number After Mutating Substring
1947	Maximum Compatibility Score Sum
1952	Three Divisors
1953	Maximum Number of Weeks for Which You Can Work
1954	Minimum Garden Perimeter to Collect Enough Apples
1955	Count Number of Special Subsequences
1957	Delete Characters to Make Fancy String
1958	Check if Move is Legal
1961	Check If String Is a Prefix of Array
1962	Remove Stones to Minimize the Total
1963	Minimum Number of Swaps to Make the String Balanced
1964	Find the Longest Valid Obstacle Course at Each Position
1967	Number of Strings That Appear as Substrings in Word
1968	Array With Elements Not Equal to Average of Neighbors
1969	Minimum Non-Zero Product of the Array Elements
1970	Last Day Where You Can Still Cross
1971	Find if Path Exists in Graph
1974	Minimum Time to Type Word Using Special Typewriter
1975	Maximum Matrix Sum
1979	Find Greatest Common Divisor of Array
1980	Find Unique Binary String
1984	Minimum Difference Between Highest and Lowest of K Scores
1985	Find the Kth Largest Integer in the Array
1991	Find the Middle Index in Array
1992	Find All Groups of Farmland
1993	Operations on Tree
1995	Count Special Quadruplets
1996	The Number of Weak Characters in the Game
2000	Reverse Prefix of Word
2001	Number of Pairs of Interchangeable Rectangles
2002	Maximum Product of the Length of Two Palindromic Subsequences
2006	Count Number of Pairs With Absolute Difference K
2007	Find Original Array From Doubled Array
2008	Maximum Earnings From Taxi
2011	Final Value of Variable After Performing Operations
2012	Sum of Beauty in the Array
2013	Detect Squares
2014	Longest Subsequence Repeated k Times
2016	Maximum Difference Between Increasing Elements
2017	Grid Game
2022	Convert 1D Array Into 2D Array
2023	Number of Pairs of Strings With Concatenation Equal to Target
2024	Maximize the Confusion of an Exam
2025	Maximum Number of Ways to Partition an Array
2027	Minimum Moves to Convert String
2028	Find Missing Observations
2029	Stone Game IX
2030	Smallest K-Length Subsequence With Occurrences of a Letter
2032	Two Out of Three
2034	Stock Price Fluctuation
2037	Minimum Number of Moves to Seat Everyone
2038	Remove Colored Pieces if Both Neighbors are the Same Color
2039	The Time When the Network Becomes Idle
2040	Kth Smallest Product of Two Sorted Arrays
2042	Check if Numbers Are Ascending in a Sentence
2043	Simple Bank System
2044	Count Number of Maximum Bitwise-OR Subsets
2045	Second Minimum Time to Reach Destination
2047	Number of Valid Words in a Sentence
2048	Next Greater Numerically Balanced Number
2049	Count Nodes With the Highest Score
2050	Parallel Courses III
2053	Kth Distinct String in an Array
2054	Two Best Non-Overlapping Events
2055	Plates Between Candles
2057	Smallest Index With Equal Value
2058	Find the Minimum and Maximum Number of Nodes Between Critical Points
2059	Minimum Operations to Convert Number
2062	Count Vowel Substrings of a String
2063	Vowels of All Substrings
2064	Minimized Maximum of Products Distributed to Any Store
2065	Maximum Path Quality of a Graph
2068	Check Whether Two Strings are Almost Equivalent
2069	Walking Robot Simulation II
2070	Most Beautiful Item for Each Query
2073	Time Needed to Buy Tickets
2074	Reverse Nodes in Even Length Groups
2075	Decode the Slanted Ciphertext
2076	Process Restricted Friend Requests
2078	Two Furthest Houses With Different Colors
2079	Watering Plants
2080	Range Frequency Queries
2081	Sum of k-Mirror Numbers
2085	Count Common Words With One Occurrence
2086	Minimum Number of Food Buckets to Feed the Hamsters
2087	Minimum Cost Homecoming of a Robot in a Grid
2088	Count Fertile Pyramids in a Land
2089	Find Target Indices After Sorting Array
2090	K Radius Subarray Averages
2091	Removing Minimum and Maximum From Array
2092	Find All People With Secret
2094	Finding 3-Digit Even Numbers
2095	Delete the Middle Node of a Linked List
2096	Step-By-Step Directions From a Binary Tree Node to Another
2099	Find Subsequence of Length K With the Largest Sum
2100	Find Good Days to Rob the Bank
2101	Detonate the Maximum Bombs
2102	Sequentially Ordinal Rank Tracker
2103	Rings and Rods
2105	Watering Plants II
2106	Maximum Fruits Harvested After at Most K Steps
2108	Find First Palindromic String in the Array
2109	Adding Spaces to a String
2110	Number of Smooth Descent Periods of a Stock
2111	Minimum Operations to Make the Array K-Increasing
2114	Maximum Number of Words Found in Sentences
2115	Find All Possible Recipes from Given Supplies
2117	Abbreviating the Product of a Range
2119	A Number After a Double Reversal
2120	Execution of All Suffix Instructions Staying in a Grid
2121	Intervals Between Identical Elements
2122	Recover the Original Array
2124	Check if All A's Appears Before All B's
2125	Number of Laser Beams in a Bank
2126	Destroying Asteroids
2129	Capitalize the Title
2130	Maximum Twin Sum of a Linked List
2131	Longest Palindrome by Concatenating Two Letter Words
2133	Check if Every Row and Column Contains All Numbers
2134	Minimum Swaps to Group All 1's Together II
2135	Count Words Obtained After Adding a Letter
2136	Earliest Possible Day of Full Bloom
2138	Divide a String Into Groups of Size k
2139	Minimum Moves to Reach Target Score
2140	Solving Questions With Brainpower
2144	Minimum Cost of Buying Candies With Discount
2145	Count the Hidden Sequences
2146	K Highest Ranked Items Within a Price Range
2147	Number of Ways to Divide a Long Corridor
2148	Count Elements With Strictly Smaller and Greater Elements
2149	Rearrange Array Elements by Sign
2150	Find All Lonely Numbers in the Array
2151	Maximum Good People Based on Statements
2154	Keep Multiplying Found Values by Two
2155	All Divisions With the Highest Score of a Binary Array
2156	Find Substring With Given Hash Value
2160	Minimum Sum of Four Digit Number After Splitting Digits
2161	Partition Array According to Given Pivot
2162	Minimum Cost to Set Cooking Time
2163	Minimum Difference in Sums After Removal of Elements
2164	Sort Even and Odd Indices Independently
2165	Smallest Value of the Rearranged Number
2166	Design Bitset
2167	Minimum Time to Remove All Cars Containing Illegal Goods
2169	Count Operations to Obtain Zero
2171	Removing Minimum Number of Magic Beans
2176	Count Equal and Divisible Pairs in an Array
2177	Find Three Consecutive Integers That Sum to a Given Number
2178	Maximum Split of Positive Even Integers
2179	Count Good Triplets in an Array
2180	Count Integers With Even Digit Sum
2181	Merge Nodes in Between Zeros
2182	Construct String With Repeat Limit
2185	Counting Words With a Given Prefix
2186	Minimum Number of Steps to Make Two Strings Anagram II
2187	Minimum Time to Complete Trips
2188	Minimum Time to Finish the Race
2190	Most Frequent Number Following Key In an Array
2191	Sort the Jumbled Numbers
2192	All Ancestors of a Node in a Directed Acyclic Graph
2194	Cells in a Range on an Excel Sheet
2195	Append K Integers With Minimal Sum
2196	Create Binary Tree From Descriptions
2197	Replace Non-Coprime Numbers in Array
2200	Find All K-Distant Indices in an Array
2201	Count Artifacts That Can Be Extracted
2202	Maximize the Topmost Element After K Moves
2206	Divide Array Into Equal Pairs
2208	Minimum Operations to Halve Array Sum
2209	Minimum White Tiles After Covering With Carpets
2210	Count Hills and Valleys in an Array
2211	Count Collisions on a Road
2212	Maximum Points in an Archery Competition
2215	Find the Difference of Two Arrays
2216	Minimum Deletions to Make Array Beautiful
2217	Find Palindrome With Fixed Length
2218	Maximum Value of K Coins From Piles
2220	Minimum Bit Flips to Convert Number
2221	Find Triangular Sum of an Array
2222	Number of Ways to Select Buildings
2224	Minimum Number of Operations to Convert Time
2225	Find Players With Zero or One Losses
2226	Maximum Candies Allocated to K Children
2227	Encrypt and Decrypt Strings
2231	Largest Number After Digit Swaps by Parity
2232	Minimize Result by Adding Parentheses to Expression
2233	Maximum Product After K Increments
2235	Add Two Integers
2236	Root Equals Sum of Children
2239	Find Closest Number to Zero
2240	Number of Ways to Buy Pens and Pencils
2241	Design an ATM Machine
2243	Calculate Digit Sum of a String
2244	Minimum Rounds to Complete All Tasks
2245	Maximum Trailing Zeros in a Cornered Path
2246	Longest Path With Different Adjacent Characters
2248	Intersection of Multiple Arrays
2249	Count Lattice Points Inside a Circle
2250	Count Number of Rectangles Containing Each Point
2251	Number of Flowers in Full Bloom
2255	Count Prefixes of a Given String
2256	Minimum Average Difference
2257	Count Unguarded Cells in the Grid
2258	Escape the Spreading Fire
2259	Remove Digit From Number to Maximize Result
2260	Minimum Consecutive Cards to Pick Up
2262	Total Appeal of A String
2264	Largest 3-Same-Digit Number in String
2265	Count Nodes Equal to Average of Subtree
2266	Count Number of Texts
2267	Check if There Is a Valid Parentheses String Path
2269	Find the K-Beauty of a Number
2270	Number of Ways to Split Array
2271	Maximum White Tiles Covered by a Carpet
2273	Find Resultant Array After Removing Anagrams
2274	Maximum Consecutive Floors Without Special Floors
2275	Largest Combination With Bitwise AND Greater Than Zero
2278	Percentage of Letter in String
2279	Maximum Bags With Full Capacity of Rocks
2280	Minimum Lines to Represent a Line Chart
2283	Check if Number Has Equal Digit Count and Digit Value
2284	Sender With Largest Word Count
2287	Rearrange Characters to Make Target String
2288	Apply Discount to Prices
2289	Steps to Make Array Non-decreasing
2290	Minimum Obstacle Removal to Reach Corner
2293	Min Max Game
2294	Partition Array Such That Maximum Difference Is K
2295	Replace Elements in an Array
2296	Design a Text Editor
2299	Strong Password Checker II
2300	Successful Pairs of Spells and Potions
2301	Match Substring After Replacement
2302	Count Subarrays With Score Less Than K
2303	Calculate Amount Paid in Taxes
2304	Minimum Path Cost in a Grid
2305	Fair Distribution of Cookies
2306	Naming a Company
2309	Greatest English Letter in Upper and Lower Case
2310	Sum of Numbers With Units Digit K
2312	Selling Pieces of Wood
2315	Count Asterisks
2316	Count Unreachable Pairs of Nodes in an Undirected Graph
2317	Maximum XOR After Operations
2318	Number of Distinct Roll Sequences
2319	Check if Matrix Is X-Matrix
2320	Count Number of Ways to Place Houses
2321	Maximum Score Of Spliced Array
2325	Decode the Message
2326	Spiral Matrix IV
2327	Number of People Aware of a Secret
2328	Number of Increasing Paths in a Grid
2331	Evaluate Boolean Binary Tree
2332	The Latest Time to Catch a Bus
2333	Minimum Sum of Squared Difference
2334	Subarray With Elements Greater Than Varying Threshold
2335	Minimum Amount of Time to Fill Cups
2336	Smallest Number in Infinite Set
2337	Move Pieces to Obtain a String
2341	Maximum Number of Pairs in Array
2342	Max Sum of a Pair With Equal Sum of Digits
2343	Query Kth Smallest Trimmed Number
2344	Minimum Deletions to Make Array Divisible
2347	Best Poker Hand
2348	Number of Zero-Filled Subarrays
2349	Design a Number Container System
2351	First Letter to Appear Twice
2352	Equal Row and Column Pairs
2353	Design a Food Rating System
2354	Number of Excellent Pairs
2357	Make Array Zero by Subtracting Equal Amounts
2358	Maximum Number of Groups Entering a Competition
2359	Find Closest Node to Given Two Nodes
2360	Longest Cycle in a Graph
2363	Merge Similar Items
2364	Count Number of Bad Pairs
2367	Number of Arithmetic Triplets
2368	Reachable Nodes With Restrictions
2373	Largest Local Values in a Matrix
2374	Node With Highest Edge Score
2375	Construct Smallest Number From DI String
2379	Minimum Recolors to Get K Consecutive Black Blocks
2381	Shifting Letters II
2382	Maximum Segment Sum After Removals
2383	Minimum Hours of Training to Win a Competition
2384	Largest Palindromic Number
2385	Amount of Time for Binary Tree to Be Infected
2389	Longest Subsequence With Limited Sum
2390	Removing Stars From a String
2391	Minimum Amount of Time to Collect Garbage
2395	Find Subarrays With Equal Sum
2396	Strictly Palindromic Number
2397	Maximum Rows Covered by Columns
2398	Maximum Number of Robots Within Budget
2399	Check Distances Between Same Letters
2400	Number of Ways to Reach a Position After Exactly k Steps
2401	Longest Nice Subarray
2402	Meeting Rooms III
2404	Most Frequent Even Element
2405	Optimal Partition of String
2406	Divide Intervals Into Minimum Number of Groups
2409	Count Days Spent Together
2410	Maximum Matching of Players With Trainers
2411	Smallest Subarrays With Maximum Bitwise OR
2412	Minimum Money Required Before Transactions
2413	Smallest Even Multiple
2414	Length of the Longest Alphabetical Continuous Substring
2415	Reverse Odd Levels of Binary Tree
2416	Sum of Prefix Scores of Strings
2418	Sort the People
2419	Longest Subarray With Maximum Bitwise AND
2420	Find All Good Indices
2423	Remove Letter To Equalize Frequency
2424	Longest Uploaded Prefix
2425	Bitwise XOR of All Pairings
2426	Number of Pairs Satisfying Inequality
2427	Number of Common Factors
2428	Maximum Sum of an Hourglass
2429	Minimize XOR
2432	The Employee That Worked on the Longest Task
2433	Find The Original Array of Prefix Xor
2434	Using a Robot to Print the Lexicographically Smallest String
2435	Paths in Matrix Whose Sum Is Divisible by K
2437	Number of Valid Clock Times
2438	Range Product Queries of Powers
2439	Minimize Maximum of Array
2441	Largest Positive Integer That Exists With Its Negative
2442	Count Number of Distinct Integers After Reverse Operations
2443	Sum of Number and Its Reverse
2444	Count Subarrays With Fixed Bounds
2446	Determine if Two Events Have Conflict
2448	Minimum Cost to Make Array Equal
2449	Minimum Number of Operations to Make Arrays Similar
2451	Odd String Difference
2452	Words Within Two Edits of Dictionary
2453	Destroy Sequential Targets
2454	Next Greater Element IV
2455	Average Value of Even Numbers That Are Divisible by Three
2456	Most Popular Video Creator
2457	Minimum Addition to Make Integer Beautiful
2458	Height of Binary Tree After Subtree Removal Queries
2460	Apply Operations to an Array
2461	Maximum Sum of Distinct Subarrays With Length K
2462	Total Cost to Hire K Workers
2465	Number of Distinct Averages
2466	Count Ways To Build Good Strings
2468	Split Message Based on Limit
2469	Convert the Temperature
2472	Maximum Number of Non-overlapping Palindrome Substrings
2475	Number of Unequal Triplets in Array
2476	Closest Nodes Queries in a Binary Search Tree
2478	Number of Beautiful Partitions
2481	Minimum Cuts to Divide a Circle
2482	Difference Between Ones and Zeros in Row and Column
2483	Minimum Penalty for a Shop
2484	Count Palindromic Subsequences
2485	Find the Pivot Integer
2486	Append Characters to String to Make Subsequence
2487	Remove Nodes From Linked List
2488	Count Subarrays With Median K
2490	Circular Sentence
2491	Divide Players Into Teams of Equal Skill
2496	Maximum Value of a String in an Array
2498	Frog Jump II
2500	Delete Greatest Value in Each Row
2501	Longest Square Streak in an Array
2502	Design Memory Allocator
2503	Maximum Number of Points From Grid Queries
2506	Count Pairs Of Similar Strings
2508	Add Edges to Make Degrees of All Nodes Even
2509	Cycle Length Queries in a Tree
2511	Maximum Enemy Forts That Can Be Captured
2512	Reward Top K Students
2513	Minimize the Maximum of Two Arrays
2514	Count Anagrams
2515	Shortest Distance to Target String in a Circular Array
2516	Take K of Each Character From Left and Right
2517	Maximum Tastiness of Candy Basket
2520	Count the Digits That Divide a Number
2521	Distinct Prime Factors of Product of Array
2523	Closest Prime Numbers in Range
2525	Categorize Box According to Criteria
2526	Find Consecutive Integers from a Data Stream
2528	Maximize the Minimum Powered City
2529	Maximum Count of Positive Integer and Negative Integer
2532	Time to Cross a Bridge
2535	Difference Between Element Sum and Digit Sum of an Array
2537	Count the Number of Good Subarrays
2540	Minimum Common Value
2541	Minimum Operations to Make Array Equal II
2544	Alternating Digit Sum
2545	Sort the Students by Their Kth Score
2547	Minimum Cost to Split an Array
2549	Count Distinct Numbers on Board
2550	Count Collisions of Monkeys on a Polygon
2553	Separate the Digits in an Array
2554	Maximum Number of Integers to Choose From a Range I
2555	Maximize Win From Two Segments
2558	Take Gifts From the Richest Pile
2559	Count Vowel Strings in Ranges
2560	House Robber IV
2561	Rearranging Fruits
2562	Find the Array Concatenation Value
2563	Count the Number of Fair Pairs
2564	Substring XOR Queries
2565	Subsequence With the Minimum Score
2566	Maximum Difference by Remapping a Digit
2568	Minimum Impossible OR
2570	Merge Two 2D Arrays by Summing Values
2574	Left and Right Sum Differences
2577	Minimum Time to Visit a Cell In a Grid
2578	Split With Minimum Sum
2579	Count Total Number of Colored Cells
2582	Pass the Pillow
2583	Kth Largest Sum in a Binary Tree
2585	Number of Ways to Earn Points
2586	Count the Number of Vowel Strings in Range
2591	Distribute Money to Maximum Children
2592	Maximize Greatness of an Array
2593	Find Score of an Array After Marking All Elements
2594	Minimum Time to Repair Cars
2595	Number of Even and Odd Bits
2596	Check Knight Tour Configuration
2597	The Number of Beautiful Subsets
2598	Smallest Missing Non-negative Integer After Operations
2600	K Items With the Maximum Sum
2601	Prime Subtraction Operation
2602	Minimum Operations to Make All Array Elements Equal
2605	Form Smallest Number From Two Digit Arrays
2606	Find the Substring With Maximum Cost
2607	Make K-Subarray Sums Equal
2609	Find the Longest Balanced Substring of a Binary String
2610	Convert an Array Into a 2D Array With Conditions
2611	Mice and Cheese
2614	Prime In Diagonal

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