Previous Questions

AMAZON

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
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
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
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
127	Word Ladder
128	Longest Consecutive Sequence
129	Sum Root to Leaf Numbers
130	Surrounded Regions
131	Palindrome Partitioning
132	Palindrome Partitioning II
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
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
157	Read N Characters Given Read4
159	Longest Substring with At Most Two Distinct Characters
160	Intersection of Two Linked Lists
161	One Edit Distance
162	Find Peak Element
164	Maximum Gap
165	Compare Version Numbers
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
174	Dungeon Game
175	Combine Two Tables
176	Second Highest Salary
177	Nth Highest Salary
178	Rank Scores
179	Largest Number
180	Consecutive Numbers
181	Employees Earning More Than Their Managers
182	Duplicate Emails
183	Customers Who Never Order
184	Department Highest Salary
185	Department Top Three Salaries
186	Reverse Words in a String II
187	Repeated DNA Sequences
188	Best Time to Buy and Sell Stock IV
189	Rotate Array
190	Reverse Bits
191	Number of 1 Bits
192	Word Frequency
193	Valid Phone Numbers
196	Delete Duplicate Emails
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
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
241	Different Ways to Add Parentheses
242	Valid Anagram
243	Shortest Word Distance
244	Shortest Word Distance II
249	Group Shifted Strings
252	Meeting Rooms
253	Meeting Rooms II
255	Verify Preorder Sequence in Binary Search Tree
256	Paint House
257	Binary Tree Paths
258	Add Digits
261	Graph Valid Tree
262	Trips and Users
263	Ugly Number
265	Paint House II
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
275	H-Index II
277	Find the Celebrity
278	First Bad Version
279	Perfect Squares
280	Wiggle Sort
282	Expression Add Operators
283	Move Zeroes
286	Walls and Gates
287	Find the Duplicate Number
289	Game of Life
290	Word Pattern
295	Find Median from Data Stream
297	Serialize and Deserialize Binary Tree
298	Binary Tree Longest Consecutive Sequence
299	Bulls and Cows
300	Longest Increasing Subsequence
301	Remove Invalid Parentheses
303	Range Sum Query - Immutable
304	Range Sum Query 2D - Immutable
305	Number of Islands II
307	Range Sum Query - Mutable
309	Best Time to Buy and Sell Stock with Cooldown
310	Minimum Height Trees
311	Sparse Matrix Multiplication
312	Burst Balloons
314	Binary Tree Vertical Order Traversal
315	Count of Smaller Numbers After Self
316	Remove Duplicate Letters
318	Maximum Product of Word Lengths
319	Bulb Switcher
322	Coin Change
323	Number of Connected Components in an Undirected Graph
324	Wiggle Sort II
325	Maximum Size Subarray Sum Equals k
326	Power of Three
327	Count of Range Sum
328	Odd Even Linked List
329	Longest Increasing Path in a Matrix
330	Patching Array
332	Reconstruct Itinerary
333	Largest BST Subtree
334	Increasing Triplet Subsequence
336	Palindrome Pairs
337	House Robber III
338	Counting Bits
339	Nested List Weight Sum
340	Longest Substring with At Most K Distinct Characters
341	Flatten Nested List Iterator
342	Power of Four
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
350	Intersection of Two Arrays II
352	Data Stream as Disjoint Intervals
353	Design Snake Game
354	Russian Doll Envelopes
355	Design Twitter
359	Logger Rate Limiter
362	Design Hit Counter
363	Max Sum of Rectangle No Larger Than K
366	Find Leaves of Binary Tree
367	Valid Perfect Square
368	Largest Divisible Subset
370	Range Addition
371	Sum of Two Integers
373	Find K Pairs with Smallest Sums
374	Guess Number Higher or Lower
376	Wiggle Subsequence
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
383	Ransom Note
384	Shuffle an Array
386	Lexicographical Numbers
387	First Unique Character in a String
388	Longest Absolute File Path
389	Find the Difference
390	Elimination Game
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
399	Evaluate Division
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
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
418	Sentence Screen Fitting
419	Battleships in a Board
420	Strong Password Checker
421	Maximum XOR of Two Numbers in an Array
424	Longest Repeating Character Replacement
432	All O`one Data Structure
433	Minimum Genetic Mutation
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
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
458	Poor Pigs
459	Repeated Substring Pattern
460	LFU Cache
461	Hamming Distance
462	Minimum Moves to Equal Array Elements II
463	Island Perimeter
465	Optimal Account Balancing
468	Validate IP Address
472	Concatenated Words
473	Matchsticks to Square
474	Ones and Zeroes
475	Heaters
476	Number Complement
480	Sliding Window Median
485	Max Consecutive Ones
486	Predict the Winner
490	The Maze
491	Non-decreasing Subsequences
493	Reverse Pairs
494	Target Sum
496	Next Greater Element I
498	Diagonal Traverse
500	Keyboard Row
501	Find Mode in Binary Search Tree
502	IPO
503	Next Greater Element II
505	The Maze II
506	Relative Ranks
507	Perfect Number
508	Most Frequent Subtree Sum
512	Maximum Alternating Subarray Sum
513	Find Bottom Left Tree Value
515	Find Largest Value in Each Tree Row
516	Longest Palindromic Subsequence
517	Super Washing Machines
518	Coin Change II
523	Continuous Subarray Sum
525	Contiguous Array
526	Beautiful Arrangement
527	Word Abbreviation
528	Swapping Nodes in a Linked List
529	Minesweeper
530	Minimum Absolute Difference in BST
531	Lonely Pixel I
532	K-diff Pairs in an Array
535	Encode and Decode TinyURL
536	Construct Binary Tree from String
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
545	Boundary of Binary Tree
546	Remove Boxes
547	Number of Provinces
550	Shortest Path to Get Food
553	Optimal Division
554	Brick Wall
556	Next Greater Element III
557	Reverse Words in a String III
560	Subarray Sum Equals K
561	Array Partition
564	Find the Closest Palindrome
567	Permutation in String
570	Managers with at Least 5 Direct Reports
572	Subtree of Another Tree
576	Out of Boundary Paths
577	Employee Bonus
579	Find Cumulative Salary of an Employee
581	Shortest Unsorted Continuous Subarray
582	Kill Process
583	Delete Operation for Two Strings
584	Find Customer Referee
588	Design In-Memory File System
594	Longest Harmonious Subsequence
595	Big Countries
601	Human Traffic of Stadium
602	Friend Requests II: Who Has the Most Friends
603	Consecutive Available Seats
605	Can Place Flowers
606	Construct String from Binary Tree
609	Find Duplicate File in System
610	Triangle Judgement
611	Valid Triangle Number
617	Merge Two Binary Trees
618	Students Report By Geography
620	Not Boring Movies
621	Task Scheduler
623	Add One Row to Tree
626	Exchange Seats
628	Maximum Product of Three Numbers
630	Course Schedule III
631	Design Excel Sum Formula
632	Smallest Range Covering Elements from K Lists
633	Sum of Square Numbers
634	Find the Derangement of An Array
636	Exclusive Time of Functions
637	Average of Levels in Binary Tree
640	Solve the Equation
642	Design Search Autocomplete System
643	Maximum Average Subarray I
645	Set Mismatch
646	Maximum Length of Pair Chain
647	Palindromic Substrings
648	Replace Words
649	Dota2 Senate
652	Find Duplicate Subtrees
653	Two Sum IV - Input is a BST
655	Print Binary Tree
657	Robot Return to Origin
658	Find K Closest Elements
661	Image Smoother
662	Maximum Width of Binary Tree
663	Equal Tree Partition
664	Strange Printer
665	Non-decreasing Array
669	Trim a Binary Search Tree
670	Maximum Swap
673	Number of Longest Increasing Subsequence
674	Longest Continuous Increasing Subsequence
675	Cut Off Trees for Golf Event
677	Map Sum Pairs
678	Valid Parenthesis String
680	Valid Palindrome II
681	Next Closest Time
682	Baseball Game
684	Redundant Connection
685	Redundant Connection II
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
694	Number of Distinct Islands
695	Max Area of Island
696	Count Binary Substrings
698	Partition to K Equal Sum Subsets
711	Number of Distinct Islands II
713	Subarray Product Less Than K
714	Best Time to Buy and Sell Stock with Transaction Fee
715	Range Module
716	Max Stack
718	Maximum Length of Repeated Subarray
719	Find K-th Smallest Pair Distance
720	Longest Word in Dictionary
721	Accounts Merge
724	Find Pivot Index
725	Split Linked List in Parts
726	Number of Atoms
728	Self Dividing Numbers
729	My Calendar I
730	Count Different Palindromic Subsequences
733	Flood Fill
735	Asteroid Collision
738	Monotone Increasing Digits
739	Daily Temperatures
740	Delete and Earn
741	Cherry Pickup
743	Closest Leaf in a Binary Tree
744	Network Delay Time
745	Find Smallest Letter Greater Than Target
747	Min Cost Climbing Stairs
753	Open the Lock
755	Reach a Number
756	Pour Water
758	Convert Binary Search Tree to Sorted Doubly Linked List
764	N-ary Tree Level Order Traversal
765	Serialize and Deserialize N-ary Tree
766	Flatten a Multilevel Doubly Linked List
767	Prime Number of Set Bits in Binary Representation
768	Partition Labels
770	Couples Holding Hands
772	Construct Quad Tree
778	Reorganize String
780	Max Chunks To Make Sorted
782	Jewels and Stones
783	Search in a Binary Search Tree
784	Insert into a Binary Search Tree
785	Basic Calculator III
787	Sliding Puzzle
789	Kth Largest Element in a Stream
790	Global and Local Inversions
791	Split BST
792	Binary Search
793	Swap Adjacent in LR String
794	Swim in Rising Water
795	K-th Symbol in Grammar
797	Rabbits in Forest
800	Letter Case Permutation
801	Is Graph Bipartite?
803	Cheapest Flights Within K Stops
806	Domino and Tromino Tiling
807	Custom Sort String
808	Number of Matching Subsequences
811	Number of Subarrays with Bounded Maximum
812	Rotate String
813	All Paths From Source to Target
815	Champagne Tower
816	Design HashSet
817	Design HashMap
819	Minimum Swaps To Make Sequences Increasing
820	Find Eventual Safe States
822	Unique Morse Code Words
826	Soup Servings
830	Largest Triangle Area
831	Largest Sum of Averages
832	Binary Tree Pruning
833	Bus Routes
836	Race Car
837	Most Common Word
838	Design Linked List
843	Binary Trees With Factors
853	Most Profit Assigning Work
854	Making A Large Island
855	Count Unique Characters of All Substrings of a Given String
856	Consecutive Numbers Sum
860	Design Circular Queue
861	Flipping an Image
863	Sum of Distances in Tree
865	Robot Room Cleaner
866	Rectangle Overlap
868	Push Dominoes
871	Keys and Rooms
872	Split Array into Fibonacci Sequence
874	Backspace String Compare
877	Shortest Path Visiting All Nodes
879	Maximize Distance to Closest Person
881	Loud and Rich
882	Peak Index in a Mountain Array
883	Car Fleet
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
896	Smallest Subtree with all the Deepest Nodes
898	Transpose Matrix
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
909	Stone Game
910	Nth Magical Number
911	Profitable Schemes
912	Random Pick with Weight
916	Decoded String at Index
917	Boats to Save People
922	Possible Bipartition
923	Super Egg Drop
924	Fair Candy Swap
925	Construct Binary Tree from Preorder and Postorder Traversal
926	Find and Replace Pattern
927	Sum of Subsequence Widths
930	All Possible Full Binary Trees
931	Maximum Frequency Stack
932	Monotonic Array
933	Increasing Order Search Tree
935	Orderly Queue
936	RLE Iterator
937	Online Stock Span
938	Numbers At Most N Given Digit Set
939	Valid Permutations for DI Sequence
940	Fruit Into Baskets
941	Sort Array By Parity
943	Sum of Subarray Minimums
945	Snakes and Ladders
946	Smallest Range II
948	Sort an Array
951	Partition Array into Disjoint Intervals
953	Reverse Only Letters
954	Maximum Sum Circular Subarray
956	Number of Music Playlists
957	Minimum Add to Make Parentheses Valid
958	Sort Array By Parity II
959	3Sum With Multiplicity
962	Flip String to Monotone Increasing
965	Unique Email Addresses
967	Minimum Falling Path Sum
969	Number of Recent Calls
971	Shortest Bridge
972	Knight Dialer
974	Reorder Data in Log Files
975	Range Sum of BST
978	Valid Mountain Array
983	Validate Stack Sequences
984	Most Stones Removed with Same Row or Column
986	Largest Time for Given Digits
988	Flip Equivalent Binary Trees
990	Verifying an Alien Dictionary
994	Prison Cells After N Days
998	Check Completeness of a Binary Tree
999	Regions Cut By Slashes
1002	Maximum Width Ramp
1008	Binary Tree Cameras
1009	Pancake Sorting
1013	Fibonacci Number
1014	K Closest Points to Origin
1016	Subarray Sums Divisible by K
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
1032	Satisfiability of Equality Equations
1034	Subarrays with K Different Integers
1035	Cousins in Binary Tree
1036	Rotting Oranges
1039	Find the Town Judge
1042	Minimum Cost to Merge Stones
1044	Find Common Characters
1045	Check If Word Is Valid After Substitutions
1046	Max Consecutive Ones III
1048	Clumsy Factorial
1049	Minimum Domino Rotations For Equal Row
1050	Construct Binary Search Tree from Preorder Traversal
1054	Complement of Base 10 Integer
1055	Pairs of Songs With Total Durations Divisible by 60
1056	Capacity To Ship Packages Within D Days
1059	Missing Element in Sorted Array
1060	Longest Repeating Substring
1065	Binary String With Substrings Representing 1 To N
1068	Digit Count in Range
1072	Next Greater Node In Linked List
1073	Number of Enclaves
1074	High Five
1075	Index Pairs of a String
1078	Remove Outermost Parentheses
1079	Sum of Root To Leaf Binary Numbers
1080	Camelcase Matching
1082	Sum of Digits in the Minimum Number
1083	Two Sum Less Than K
1084	Find K-Length Substrings With No Repeated Characters
1087	Longest Arithmetic Subsequence
1088	Number of Days in a Month
1089	Remove Vowels from a String
1090	Armstrong Number
1091	Maximum Average Subtree
1092	Maximum Difference Between Node and Ancestor
1093	Recover a Tree From Preorder Traversal
1095	Two City Scheduling
1097	Stream of Characters
1098	Largest Unique Number
1099	Path With Maximum Minimum Value
1100	Connecting Cities With Minimum Cost
1101	Parallel Courses
1104	Coloring A Border
1105	Uncrossed Lines
1107	Minimum Swaps to Group All 1’s Together
1108	Analyze User Website Visit Pattern
1111	Minimum Score Triangulation of Polygon
1112	Find Words That Can Be Formed by Characters
1114	Binary Search Tree to Greater Sum Tree
1116	Maximum Level Sum of a Binary Tree
1117	As Far from Land as Possible
1119	Robot Bounded In Circle
1120	Flower Planting With No Adjacent
1121	Partition Array for Maximum Sum
1122	Longest Duplicate Substring
1125	Design File System
1126	Minimum Cost to Connect Sticks
1127	Last Stone Weight
1128	Remove All Adjacent Duplicates In String
1129	Longest String Chain
1135	Customers Who Bought All Products
1136	Actors and Directors Who Cooperated At Least Three Times
1140	Distant Barcodes
1142	Minimum Knight Moves
1145	Number of Submatrices That Sum to Target
1146	Greatest Common Divisor of Strings
1150	Two Sum BSTs
1153	Product Sales Analysis I
1154	Product Sales Analysis II
1155	Product Sales Analysis III
1157	Insufficient Nodes in Root to Leaf Paths
1159	Smallest Subsequence of Distinct Characters
1161	Project Employees I
1165	Meeting Scheduler
1168	Duplicate Zeros
1170	Shortest Common Supersequence
1171	Shortest Path in Binary Matrix
1172	Sales Analysis I
1173	Sales Analysis II
1174	Sales Analysis III
1176	Design A Leaderboard
1178	Valid Palindrome III
1179	Game Play Analysis I
1184	Car Pooling
1185	Find in Mountain Array
1191	Synonymous Sentences
1194	Path In Zigzag Labelled Binary Tree
1196	Filling Bookcase Shelves
1205	Defanging an IP Address
1206	Corporate Flight Bookings
1207	Delete Nodes And Return Forest
1212	Sequential Digits
1213	Handshakes That Don’t Cross
1214	Highest Grade For Each Student
1217	Relative Sort Array
1220	Smallest Sufficient Team
1221	Element Appearing More Than 25% In Sorted Array
1222	Remove Covered Intervals
1227	Number of Equivalent Domino Pairs
1228	Minimum Cost Tree From Leaf Values
1229	Shortest Path with Alternating Colors
1231	Replace Elements with Greatest Element on Right Side
1238	Alphabet Board Path
1241	Decompress Run-Length Encoded List
1243	Sum of Nodes with Even-Valued Grandparent
1249	Snapshot Array
1250	Longest Common Subsequence
1253	Sort the Matrix Diagonally
1254	Deepest Leaves Sum
1258	Article Views I
1261	Swap For Longest Repeated Character Substring
1263	Number of Dice Rolls With Target Sum
1267	Remove Zero Sum Consecutive Nodes from Linked List
1272	Invalid Transactions
1274	Number of Days Between Two Dates
1275	Validate Binary Tree Nodes
1276	Closest Divisors
1277	Largest Multiple of Three
1278	Product Price at a Given Date
1279	Prime Arrangements
1280	Diet Plan Performance
1285	Balance a Binary Search Tree
1286	Constrained Subsequence Sum
1288	Maximum Subarray Sum with One Deletion
1295	Minimum Garden Perimeter to Collect Enough Apples
1296	Kth Ancestor of a Tree Node
1298	Reverse Substrings Between Each Pair of Parentheses
1299	K-Concatenation Maximum Sum
1300	Critical Connections in a Network
1301	Reformat Department Table
1303	Minimum Moves to Reach Target Score
1304	Longest Happy String
1305	Number of Visible People in a Queue
1306	Minimum Absolute Difference
1308	Smallest String With Swaps
1309	Sort Items by Groups Respecting Dependencies
1316	Fizz Buzz Multithreaded
1319	Unique Number of Occurrences
1320	Remove All Adjacent Duplicates in String II
1324	Where Will the Ball Fall
1327	Last Person to Fit in the Bus
1330	Longest Arithmetic Subsequence of Given Difference
1331	Path with Maximum Gold
1332	Count Vowels Permutation
1338	Queries Quality and Percentage
1349	Check If It Is a Straight Line
1350	Remove Sub-Folders from the Filesystem
1351	Replace the Substring for Balanced String
1352	Maximum Profit in Job Scheduling
1353	Find Resultant Array After Removing Anagrams
1355	Minimum Deletions to Make Array Beautiful
1356	Minimum Number of Moves to Make Palindrome
1364	Tuple with Same Product
1366	First Unique Number
1370	Count Number of Nice Subarrays
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
1386	Shift 2D Grid
1390	Average Selling Price
1392	Find the Difference of Two Arrays
1393	Maximum Value of K Coins From Piles
1397	Search Suggestions System
1400	Find Winner on a Tic Tac Toe Game
1402	Count Square Submatrices with All Ones
1407	Group the People Given the Group Size They Belong To
1411	Convert Binary Number in a Linked List to Integer
1414	Shortest Path in a Grid with Obstacles Elimination
1415	Students and Examinations
1418	Fair Distribution of Cookies
1421	Find Numbers with Even Number of Digits
1423	Maximum Number of Occurrences of a Substring
1426	Find N Unique Integers Sum up to Zero
1427	All Elements in Two Binary Search Trees
1428	Jump Game III
1436	Get Watched Videos by Your Friends
1437	Minimum Insertion Steps to Make a String Palindrome
1438	Find the Team Size
1446	Angle Between Hands of a Clock
1447	Jump Game IV
1450	Delete Leaves With a Given Value
1451	Minimum Number of Taps to Open to Water a Garden
1454	Remove Palindromic Subsequences
1456	Find the City With the Smallest Number of Neighbors at a Threshold Distance
1457	Minimum Difficulty of a Job Schedule
1461	Count All Valid Pickup and Delivery Options
1462	List the Products Ordered in a Period
1463	The K Weakest Rows in a Matrix
1464	Reduce Array Size to The Half
1465	Maximum Product of Splitted Binary Tree
1466	Jump Game V
1468	Check If N and Its Double Exist
1474	Longest ZigZag Path in a Binary Tree
1475	Maximum Sum BST in Binary Tree
1476	Count Negative Numbers in a Sorted Matrix
1477	Product of the Last K Numbers
1478	Maximum Number of Events That Can Be Attended
1479	Construct Target Array With Multiple Sums
1481	Students With Invalid Departments
1482	How Many Numbers Are Smaller Than the Current Number
1484	Linked List in Binary Tree
1486	Find the Distance Value Between Two Arrays
1487	Cinema Seat Allocation
1492	Time Needed to Inform All Employees
1496	Lucky Numbers in a Matrix
1497	Design a Stack With Increment Operation
1498	Find a Corresponding Node of a Binary Tree in a Clone of That Tree
1499	Maximum Performance of a Team
1508	Longest Happy Prefix
1509	Replace Employee ID With The Unique Identifier
1511	Count Number of Teams
1512	Design Underground System
1514	Minimum Value to Get Positive Step by Step Sum
1515	Find the Minimum Number of Fibonacci Numbers Whose Sum Is K
1520	Number of Steps to Reduce a Number in Binary Representation to One
1523	Capital Gain/Loss
1524	String Matching in an Array
1525	Queries on a Permutation With Key
1528	Kids With the Greatest Number of Candies
1534	Minimum Number of Frogs Croaking
1535	Build Array Where You Can Find The Maximum Exactly K Comparisons
1536	Customers Who Bought Products A and B but Not C
1538	Maximum Points You Can Obtain from Cards
1544	Count Good Nodes in Binary Tree
1547	Destination City
1549	Longest Continuous Subarray With Absolute Diff Less Than or Equal to Limit
1551	NPV Queries
1557	Check If a String Contains All Binary Codes of Size K
1559	Cherry Pickup II
1566	Check If a Word Occurs As a Prefix of Any Word in a Sentence
1567	Maximum Number of Vowels in a Substring of Given Length
1568	Pseudo-Palindromic Paths in a Binary Tree
1570	Final Prices With a Special Discount in a Shop
1574	Maximum Product of Two Elements in an Array
1575	Maximum Area of a Piece of Cake After Horizontal and Vertical Cuts
1579	Active Users
1580	Shuffle the Array
1582	Design Browser History
1584	Average Salary Excluding the Minimum and Maximum Salary
1585	The kth Factor of n
1586	Longest Subarray of 1’s After Deleting One Element
1603	Running Sum of 1d Array
1604	Least Number of Unique Integers after K Removals
1605	Minimum Number of Days to Make m Bouquets
1612	Avoid Flood in The City
1613	Find Critical and Pseudo-Critical Edges in Minimum Spanning Tree
1616	Minimum Difference Between Largest and Smallest Value in Three Moves
1619	Path Crossing
1620	Check If Array Pairs Are Divisible by k
1621	Number of Subsequences That Satisfy the Given Sum Condition
1623	Sales by Day of the Week
1624	Clone Binary Tree With Random Pointer
1626	Can Make Arithmetic Progression From Sequence
1630	Count Odd Numbers in an Interval Range
1632	Number of Good Ways to Split a String
1634	Clone N-ary Tree
1635	Number of Good Pairs
1637	String Compression II
1639	Friendly Movies Streamed Last Month
1644	Maximum Number of Non-Overlapping Substrings
1646	Kth Missing Positive Number
1651	Shuffle String
1652	Minimum Suffix Flips
1654	Customer Order Frequency
1656	Count Good Triplets
1662	Minimum Numbers of Function Calls to Make Target Array
1669	Minimum Cost to Cut a Stick
1672	Find the Index of the Large Integer
1675	Magnetic Force Between Two Balls
1676	Minimum Number of Days to Eat N Oranges
1677	Matrix Diagonal Sum
1679	Shortest Subarray to be Removed to Make Array Sorted
1680	Count All Possible Routes
1683	Maximum Number of Coins You Can Get
1684	Find Latest Group of Size M
1685	Stone Game V
1690	Maximum Length of Subarray With Positive Product
1692	Number of Ways to Reorder Array to Get Same BST
1693	Sum of All Odd Length Subarrays
1694	Make Sum Divisible by P
1700	Minimum Time to Make Rope Colorful
1706	Min Cost to Connect All Points
1708	Design Parking System
1713	Dot Product of Two Sparse Vectors
1715	Split a String Into the Max Number of Unique Substrings
1718	Warehouse Manager
1723	Maximum Number of Achievable Transfer Requests
1724	Customer Who Visited but Did Not Make Any Transactions
1725	Number of Sets of K Non-Overlapping Line Segments
1730	Special Array With X Elements Greater Than or Equal X
1731	Even Odd Tree
1736	Build Binary Expression Tree From Infix Expression
1737	Maximum Nesting Depth of the Parentheses
1741	Sort Array by Increasing Frequency
1753	Path With Minimum Effort
1757	Minimum Jumps to Reach Home
1758	Distribute Repeating Integers
1759	Find the Missing IDs
1761	Count Sorted Vowel Strings
1762	Furthest Building You Can Reach
1763	All Valid Triplets That Can Represent a Country
1767	Design Front Middle Back Queue
1768	Design an Expression Tree With Evaluate Function
1770	Minimum Deletions to Make Character Frequencies Unique
1771	Sell Diminishing-Valued Colored Balls
1772	Create Sorted Array through Instructions
1774	Add Two Polynomials Represented as Linked Lists
1776	Minimum Operations to Reduce X to Zero
1781	Check If Two String Arrays are Equivalent
1782	Smallest String With A Given Numeric Value
1790	Lowest Common Ancestor of a Binary Tree III
1791	Richest Customer Wealth
1792	Find the Most Competitive Subsequence
1797	Goal Parser Interpretation
1798	Max Number of K-Sum Pairs
1800	Concatenation of Consecutive Binary Numbers
1801	Average Time of Process per Machine
1802	Number of Students Unable to Eat Lunch
1805	Minimum Adjacent Swaps for K Consecutive Ones
1806	Count of Matches in Tournament
1807	Partitioning Into Minimum Number Of Deci-Binary Numbers
1813	Maximum Erasure Value
1814	Jump Game VI
1816	Lowest Common Ancestor of a Binary Tree IV
1817	Calculate Money in Leetcode Bank
1823	Determine if String Halves Are Alike
1824	Maximum Number of Eaten Apples
1825	Find Minimum Time to Finish All Jobs
1827	Invalid Tweets
1829	Maximum Units on a Truck
1835	Decode XORed Permutation
1836	Count Ways to Make Array With Product
1842	Number of Calls Between Two Persons
1845	Largest Submatrix With Rearrangements
1849	Maximum Absolute Sum of Any Subarray
1850	Minimum Length of String After Deleting Similar Ends
1851	Maximum Number of Events That Can Be Attended II
1874	Form Array by Concatenating Subarrays of Another Array
1878	Check if Array Is Sorted and Rotated
1882	The Number of Employees Which Report to Each Employee
1883	Find Distance in a Binary Tree
1886	Minimum Limit of Balls in a Bag
1887	Minimum Degree of a Connected Trio in a Graph
1888	Find Nearest Point That Has the Same X or Y Coordinate
1891	Count Pairs Of Nodes
1892	Find Total Time Spent by Each Employee
1894	Merge Strings Alternately
1895	Minimum Number of Operations to Move All Balls to Each Box
1908	Recyclable and Low Fat Products
1909	Buildings With an Ocean View
1915	Check if One String Swap Can Make Strings Equal
1917	Maximum Average Pass Ratio
1918	Maximum Score of a Good Subarray
1919	Sort Features by Popularity
1925	Count Nice Pairs in an Array
1926	Product’s Price for Each Store
1932	Grand Slam Titles
1937	Maximize the Beauty of the Garden
1938	Minimum Operations to Make the Array Increasing
1947	Number of Different Subsequences GCDs
1948	Rearrange Products Table
1951	Find the Winner of the Circular Game
1952	Minimum Sideway Jumps
1956	Maximum Element After Decreasing and Rearranging
1957	Closest Room
1958	Ad-Free Sessions
1962	Single-Threaded CPU
1964	Find Interview Candidates
1966	Frequency of the Most Frequent Element
1970	Sorting the Sentence
1978	Minimum Adjacent Swaps to Reach the Kth Smallest Number
1983	Maximum Population Year
1985	Maximum Subarray Min-Product
1987	Substrings of Size Three with Distinct Characters
1988	Minimize Maximum Pair Sum in Array
1993	Sum of All Subset XOR Totals
1994	Minimum Number of Swaps to Make the Binary String Alternating
1997	Next Palindrome Using Same Digits
2000	Minimum Speed to Arrive on Time
2001	Jump Game VII
2003	Distinct Numbers in Each Subarray
2012	Process Tasks Using Servers
2015	Determine Whether Matrix Can Be Obtained By Rotation
2018	Minimum Space Wasted From Packaging
2021	Remove All Occurrences of a Substring
2031	Egg Drop With 2 Eggs and N Floors
2032	Largest Odd Number in String
2038	Nearest Exit from Entrance in Maze
2042	Maximum Product Difference Between Two Pairs
2047	Find a Peak Element II
2048	Build Array from Permutation
2051	Longest Common Subpath
2054	The Number of the Smallest Unoccupied Chair
2056	Jump Game VIII
2058	Concatenation of Array
2060	Merge BSTs to Create Single BST
2065	Check for Contradictions in Equations
2072	Maximum of Minimum Values in All Subarrays
2075	Brightest Position on Street
2080	Check if Move is Legal
2084	Maximum Number of Weeks for Which You Can Work
2086	Count Number of Special Subsequences
2087	Confirmation Rate
2094	Remove Stones to Minimize the Total
2095	Minimum Number of Swaps to Make the String Balanced
2108	Minimize the Difference Between Target and Chosen Elements
2116	Count Number of Pairs With Absolute Difference K
2117	Find Original Array From Doubled Array
2119	Minimum Number of Operations to Make Array Continuous
2120	First and Last Call On the Same Day
2121	Find if Path Exists in Graph
2125	GCD Sort of an Array
2132	Convert 1D Array Into 2D Array
2134	Maximize the Confusion of an Exam
2138	Sum of Beauty in the Array
2144	Maximum Difference Between Increasing Elements
2147	The Score of Students Solving Math Expression
2149	Remove Colored Pieces if Both Neighbors are the Same Color
2150	Kth Smallest Product of Two Sorted Arrays
2155	Find Missing Observations
2161	Stock Price Fluctuation
2162	Partition Array Into Two Arrays to Minimize Sum Difference
2163	Kth Distinct String in an Array
2165	Plates Between Candles
2173	Number of Valid Words in a Sentence
2175	Count Nodes With the Highest Score
2179	Most Beautiful Item for Each Query
2182	Find the Minimum and Maximum Number of Nodes Between Critical Points
2183	Minimum Operations to Convert Number
2188	Minimized Maximum of Products Distributed to Any Store
2192	Minimum Cost Homecoming of a Robot in a Grid
2197	Decode the Slanted Ciphertext
2204	Find Subsequence of Length K With the Largest Sum
2205	Find Good Days to Rob the Bank
2206	Detonate the Maximum Bombs
2207	Sequentially Ordinal Rank Tracker
2210	Find Target Indices After Sorting Array
2211	K Radius Subarray Averages
2216	Delete the Middle Node of a Linked List
2217	Step-By-Step Directions From a Binary Tree Node to Another
2220	Find All Possible Recipes from Given Supplies
2221	Check if a Parentheses String Can Be Valid
2227	Sum of Subarray Ranges
2231	Find First Palindromic String in the Array
2232	Adding Spaces to a String
2233	Number of Smooth Descent Periods of a Stock
2234	Minimum Operations to Make the Array K-Increasing
2236	Maximum Twin Sum of a Linked List
2237	Longest Palindrome by Concatenating Two Letter Words
2244	Number of Laser Beams in a Bank
2249	Count the Hidden Sequences
2255	Minimum Swaps to Group All 1’s Together II
2256	Count Words Obtained After Adding a Letter
2259	Minimum Operations to Remove Adjacent Ones in Matrix
2262	Solving Questions With Brainpower
2263	Maximum Running Time of N Computers
2264	Minimum Sum of Four Digit Number After Splitting Digits
2265	Partition Array According to Given Pivot
2267	Minimum Difference in Sums After Removal of Elements
2271	Rearrange Array Elements by Sign
2274	Keep Multiplying Found Values by Two
2285	Design Bitset
2288	Count Operations to Obtain Zero
2294	Minimum Time to Complete Trips
2301	Count Array Pairs Divisible by K
2302	Order Two Columns Independently
2304	Cells in a Range on an Excel Sheet
2305	Append K Integers With Minimal Sum
2307	Replace Non-Coprime Numbers in Array
2309	Maximize Number of Subsequences in a String
2313	Longest Winning Streak
2324	Find Triangular Sum of an Array
2325	Number of Ways to Select Buildings
2326	Sum of Scores of Built Strings
2330	Maximum Total Beauty of the Gardens
2333	Count Number of Rectangles Containing Each Point
2334	Number of Flowers in Full Bloom
2337	Remove Digit From Number to Maximize Result
2339	K Divisible Elements Subarrays
2340	Total Appeal of A String
2342	Minimum Average Difference
2347	Count Nodes Equal to Average of Subtree
2348	Count Number of Texts
2350	Find Closest Number to Zero
2354	Minimum Health to Beat Game
2355	Maximum Consecutive Floors Without Special Floors
2358	Number of Ways to Split Array
2360	Substring With Largest Variance
2362	Minimum Rounds to Complete All Tasks
2364	Longest Path With Different Adjacent Characters
2366	Maximum Bags With Full Capacity of Rocks
2368	Sum of Total Strength of Wizards
2369	Maximum Sum Score of Array
2370	Users With Two Purchases Within Seven Days
2372	Rearrange Characters to Make Target String
2373	Apply Discount to Prices
2374	Steps to Make Array Non-decreasing
2376	Number of Times a Driver Was a Passenger
2383	Add Two Integers
2384	Root Equals Sum of Children
2387	Partition Array Such That Maximum Difference Is K
2388	Replace Elements in an Array
2389	Design a Text Editor
2394	Count Subarrays With Score Less Than K
2395	Longest Binary Subsequence Less Than or Equal to K
2400	Minimum Score After Removals on a Tree
2403	Count Unreachable Pairs of Nodes in an Undirected Graph
2405	Minimum Number of Keypresses
2408	Number of People Aware of a Secret
2409	Number of Increasing Paths in a Grid
2413	Smallest Number in Infinite Set
2414	Move Pieces to Obtain a String
2418	Minimum Sum of Squared Difference
2421	Maximum Number of Pairs in Array
2428	Equal Row and Column Pairs
2429	Design a Food Rating System
2431	Products With Three or More Orders in Two Consecutive Years
2433	Best Poker Hand
2435	Shortest Impossible Sequence of Rolls
2436	Make Array Zero by Subtracting Equal Amounts
2443	Check if There is a Valid Partition For The Array
2449	Maximum Number of Robots Within Budget
2450	Minimum Replacements to Sort the Array
2451	Product Sales Analysis IV
2452	Product Sales Analysis V
2456	Construct Smallest Number From DI String
2457	Count Special Integers
2458	Find Minimum Time to Finish All Jobs II
2461	Amount of Time for Binary Tree to Be Infected
2462	Find the K-Sum of an Array
2464	Time Needed to Rearrange a Binary String
2468	Valid Palindrome IV
2470	Removing Stars From a String
2471	Minimum Amount of Time to Collect Garbage
2473	Max Sum of a Pair With Equal Sum of Digits
2474	Minimum Adjacent Swaps to Make a Valid Array
2477	Number of Ways to Reach a Position After Exactly k Steps
2481	Strictly Palindromic Number
2487	Optimal Partition of String
2488	Divide Intervals Into Minimum Number of Groups
2490	Maximum Number of Books You Can Take
2491	Smallest Even Multiple
2497	Maximum Matching of Players With Trainers
2498	Smallest Subarrays With Maximum Bitwise OR
2499	Minimum Money Required Before Transactions
2504	Find All Good Indices
2520	Using a Robot to Print the Lexicographically Smallest String
2530	Minimize Maximum of Array
2534	Employees With Deductions
2538	Minimum Cost to Make Array Equal
2541	Sum of Number and Its Reverse
2552	Maximum Sum of Distinct Subarrays With Length K
2553	Total Cost to Hire K Workers
2555	Design SQL
2558	Minimum Number of Operations to Sort a Binary Tree by Level
2561	Number of Distinct Averages
2565	Merge Operations to Turn Array Into a Palindrome
2566	Number of Unequal Triplets in Array
2571	Find the Pivot Integer
2572	Append Characters to String to Make Subsequence
2573	Remove Nodes From Linked List
2576	Minimum Penalty for a Shop
2586	Longest Square Streak in an Array
2587	Design Memory Allocator
2590	Maximum Star Sum of a Graph
2603	Reward Top K Students
2606	Difference Between Ones and Zeros in Row and Column
2613	Customers With Strictly Increasing Purchases
2614	Maximum Count of Positive Integer and Negative Integer
2617	Time Taken to Cross the Door
2621	Find Xor-Beauty of Array
2636	Maximum Subsequence Score
2646	Kth Largest Sum in a Binary Tree
2650	Split With Minimum Sum
2658	Count the Number of K-Big Indices
2669	Find the Substring With Maximum Cost
2670	Make K-Subarray Sums Equal
2677	Cousins in Binary Tree II
2681	Put Marbles in Bags
2684	Determine the Winner of a Bowling Game
2692	Take Gifts From the Richest Pile
2713	Find the Divisibility Array of a String
2720	Minimize the Maximum Difference of Pairs
2724	Convert an Array Into a 2D Array With Conditions
2732	Counter
2734	Array Prototype Last
2738	Count the Number of K-Free Subsets
2741	Function Composition
2743	Debounce
2755	Extra Characters in a String
2756	Buy Two Chocolates
2757	Count of Integers
2762	Cache With Time Limit
2789	Counter II
2794	Maximum Number of Moves in a Grid
2796	Allow One Function Call
2808	Painting the Walls
2809	Create Hello World Function
2810	Collecting Chocolates
2812	Find the Maximum Achievable Number
2813	To Be Or Not To Be
2818	Maximum Strictly Increasing Cells in a Matrix
2834	Relocate Marbles
2868	Continuous Subarrays
2871	Double a Number Represented as a Linked List
2884	Length of the Longest Valid Substring
2921	Count Stepping Numbers in Range
2954	Maximum Sum of Almost Unique Subarray
2979	Maximize the Profit as the Salesman
2995	Number of Unique Categories
3018	Make String a Subsequence Using Cyclic Increments
3019	Furthest Point From Origin
3025	Minimum Operations to Form Subsequence With Target Sum
3045	Minimum Right Shifts to Sort the Array
3062	Create a DataFrame from List
3088	Maximal Range That Each Element Is Maximum in It
3094	Minimum Number of Operations to Make Array Empty
3095	Maximum Number of Alloys
3139	Subarrays Distinct Element Sum of Squares II
3150	Shortest and Lexicographically Smallest Beautiful String
3182	Maximum Linear Stock Score
3183	Find the K-or of an Array
3184	Maximum Balanced Subsequence Sum
3194	Find Words Containing Character
3199	Distribute Candies Among Children I
3201	Distribute Candies Among Children II
3207	Make Three Strings Equal
3208	Count Beautiful Substrings II
3210	Count Beautiful Substrings I
3211	Find Maximum Non-decreasing Array Length
3216	Distribute Candies Among Children III