Previous Questions

MICROSOFT

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
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
88	Merge Sorted Array
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
108	Convert Sorted Array to Binary Search Tree
109	Convert Sorted List to Binary Search Tree
112	Path Sum
113	Path Sum II
114	Flatten Binary Tree to Linked List
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
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
133	Clone Graph
134	Gas Station
135	Candy
136	Single Number
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
146	LRU Cache
147	Insertion Sort List
148	Sort List
149	Max Points on a Line
150	Evaluate Reverse Polish Notation
151	Reverse Words in a String
152	Maximum Product Subarray
153	Find Minimum in Rotated Sorted Array
154	Find Minimum in Rotated Sorted Array II
155	Min Stack
158	Read N Characters Given read4 II - Call Multiple Times
159	Longest Substring with At Most Two Distinct Characters
160	Intersection of Two Linked Lists
162	Find Peak Element
163	Missing Ranges
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
174	Dungeon Game
175	Combine Two Tables
176	Second Highest Salary
177	Nth Highest Salary
179	Largest Number
181	Employees Earning More Than Their Managers
184	Department Highest Salary
186	Reverse Words in a String II
189	Rotate Array
190	Reverse Bits
191	Number of 1 Bits
192	Word Frequency
198	House Robber
199	Binary Tree Right Side View
200	Number of Islands
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
218	The Skyline Problem
219	Contains Duplicate II
221	Maximal Square
222	Count Complete Tree Nodes
224	Basic Calculator
225	Implement Stack using Queues
226	Invert Binary Tree
227	Basic Calculator II
229	Majority Element II
230	Kth Smallest Element in a BST
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
250	Count Univalue Subtrees
253	Meeting Rooms II
257	Binary Tree Paths
258	Add Digits
261	Graph Valid Tree
268	Missing Number
269	Alien Dictionary
270	Closest Binary Search Tree Value
273	Integer to English Words
274	H-Index
277	Find the Celebrity
278	First Bad Version
279	Perfect Squares
280	Wiggle Sort
283	Move Zeroes
285	Inorder Successor in BST
286	Walls and Gates
287	Find the Duplicate Number
289	Game of Life
292	Nim Game
295	Find Median from Data Stream
296	Best Meeting Point
297	Serialize and Deserialize Binary Tree
300	Longest Increasing Subsequence
301	Remove Invalid Parentheses
312	Burst Balloons
314	Binary Tree Vertical Order Traversal
315	Count of Smaller Numbers After Self
316	Remove Duplicate Letters
317	Shortest Distance from All Buildings
319	Bulb Switcher
322	Coin Change
323	Number of Connected Components in an Undirected Graph
324	Wiggle Sort II
328	Odd Even Linked List
329	Longest Increasing Path in a Matrix
333	Largest BST Subtree
336	Palindrome Pairs
337	House Robber III
338	Counting Bits
340	Longest Substring with At Most K Distinct Characters
341	Flatten Nested List Iterator
343	Integer Break
344	Reverse String
345	Reverse Vowels of a String
347	Top K Frequent Elements
348	Design Tic-Tac-Toe
349	Intersection of Two Arrays
350	Intersection of Two Arrays II
353	Design Snake Game
354	Russian Doll Envelopes
355	Design Twitter
358	Rearrange String k Distance Apart
359	Logger Rate Limiter
362	Design Hit Counter
365	Water and Jug Problem
366	Find Leaves of Binary Tree
367	Valid Perfect Square
368	Largest Divisible Subset
371	Sum of Two Integers
373	Find K Pairs with Smallest Sums
377	Combination Sum IV
378	Kth Smallest Element in a Sorted Matrix
380	Insert Delete GetRandom O(1)
387	First Unique Character in a String
389	Find the Difference
392	Is Subsequence
394	Decode String
395	Longest Substring with At Least K Repeating Characters
399	Evaluate Division
400	Nth Digit
402	Remove K Digits
403	Frog Jump
412	Fizz Buzz
414	Third Maximum Number
415	Add Strings
416	Partition Equal Subset Sum
417	Pacific Atlantic Water Flow
419	Battleships in a Board
435	Non-overlapping Intervals
437	Path Sum III
438	Find All Anagrams in a String
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
455	Assign Cookies
456	132 Pattern
460	LFU Cache
462	Minimum Moves to Equal Array Elements II
468	Validate IP Address
472	Concatenated Words
473	Matchsticks to Square
475	Heaters
480	Sliding Window Median
485	Max Consecutive Ones
486	Predict the Winner
490	The Maze
493	Reverse Pairs
496	Next Greater Element I
498	Diagonal Traverse
503	Next Greater Element II
505	The Maze II
506	Relative Ranks
509	Inorder Successor in BST II
513	Find Bottom Left Tree Value
516	Longest Palindromic Subsequence
517	Super Washing Machines
518	Coin Change II
519	Widest Pair of Indices With Equal Range Sum
525	Contiguous Array
529	Minesweeper
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
556	Next Greater Element III
557	Reverse Words in a String III
560	Subarray Sum Equals K
567	Permutation in String
568	Maximum Vacation Days
572	Subtree of Another Tree
581	Shortest Unsorted Continuous Subarray
582	Kill Process
583	Delete Operation for Two Strings
588	Design In-Memory File System
591	Tag Validator
593	Valid Square
605	Can Place Flowers
611	Valid Triangle Number
621	Task Scheduler
628	Maximum Product of Three Numbers
631	Design Excel Sum Formula
632	Smallest Range Covering Elements from K Lists
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
647	Palindromic Substrings
650	2 Keys Keyboard
651	4 Keys Keyboard
653	Two Sum IV - Input is a BST
654	Maximum Binary Tree
661	Image Smoother
662	Maximum Width of Binary Tree
669	Trim a Binary Search Tree
672	Bulb Switcher II
678	Valid Parenthesis String
680	Valid Palindrome II
681	Next Closest Time
684	Redundant Connection
692	Top K Frequent Words
694	Number of Distinct Islands
695	Max Area of Island
698	Partition to K Equal Sum Subsets
716	Max Stack
718	Maximum Length of Repeated Subarray
720	Longest Word in Dictionary
722	Remove Comments
724	Find Pivot Index
726	Number of Atoms
729	My Calendar I
733	Flood Fill
735	Asteroid Collision
739	Daily Temperatures
744	Network Delay Time
747	Min Cost Climbing Stairs
758	Convert Binary Search Tree to Sorted Doubly Linked List
761	Employee Free Time
765	Serialize and Deserialize N-ary Tree
768	Partition Labels
774	Maximum Depth of N-ary Tree
778	Reorganize String
779	Max Chunks To Make Sorted II
782	Jewels and Stones
783	Search in a Binary Search Tree
785	Basic Calculator III
789	Kth Largest Element in a Stream
792	Binary Search
800	Letter Case Permutation
801	Is Graph Bipartite?
803	Cheapest Flights Within K Stops
808	Number of Matching Subsequences
810	Valid Tic-Tac-Toe State
812	Rotate String
816	Design HashSet
817	Design HashMap
823	Split Array With Same Average
833	Bus Routes
838	Design Linked List
850	Insert into a Sorted Circular Linked List
854	Making A Large Island
860	Design Circular Queue
862	Find And Replace in String
864	Image Overlap
865	Robot Room Cleaner
866	Rectangle Overlap
871	Keys and Rooms
873	Guess the Word
874	Backspace String Compare
875	Longest Mountain in Array
877	Shortest Path Visiting All Nodes
879	Maximize Distance to Closest Person
883	Car Fleet
886	Score of Parentheses
889	Buddy Strings
893	All Nodes Distance K in Binary Tree
900	Reordered Power of 2
902	Minimum Number of Refueling Stops
903	Implement Rand10() Using Rand7()
908	Middle of the Linked List
912	Random Pick with Weight
917	Boats to Save People
921	Spiral Matrix III
922	Possible Bipartition
931	Maximum Frequency Stack
937	Online Stock Span
941	Sort Array By Parity
943	Sum of Subarray Minimums
945	Snakes and Ladders
948	Sort an Array
957	Minimum Add to Make Parentheses Valid
962	Flip String to Monotone Increasing
971	Shortest Bridge
988	Flip Equivalent Binary Trees
990	Verifying an Alien Dictionary
1007	Numbers With Same Consecutive Differences
1008	Binary Tree Cameras
1012	Equal Rational Numbers
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
1023	Time Based Key-Value Store
1026	String Without AAA or BBB
1028	Interval List Intersections
1029	Vertical Order Traversal of a Binary Tree
1032	Satisfiability of Equality Equations
1035	Cousins in Binary Tree
1036	Rotting Oranges
1037	Minimum Number of K Consecutive Bit Flips
1046	Max Consecutive Ones III
1048	Clumsy Factorial
1050	Construct Binary Search Tree from Preorder Traversal
1056	Capacity To Ship Packages Within D Days
1062	Partition Array Into Three Parts With Equal Sum
1072	Next Greater Node In Linked List
1078	Remove Outermost Parentheses
1086	Divisor Game
1087	Longest Arithmetic Subsequence
1093	Recover a Tree From Preorder Traversal
1095	Two City Scheduling
1096	Maximum Sum of Two Non-Overlapping Subarrays
1097	Stream of Characters
1101	Parallel Courses
1116	Maximum Level Sum of a Binary Tree
1117	As Far from Land as Possible
1122	Longest Duplicate Substring
1125	Design File System
1128	Remove All Adjacent Duplicates In String
1139	Previous Permutation With One Swap
1142	Minimum Knight Moves
1143	Find Smallest Common Element in All Rows
1170	Shortest Common Supersequence
1171	Shortest Path in Binary Matrix
1176	Design A Leaderboard
1183	Statistics from a Large Sample
1184	Car Pooling
1201	Delete Tree Nodes
1202	Palindrome Removal
1203	Print in Order
1205	Defanging an IP Address
1230	Maximum of Absolute Value Expression
1249	Snapshot Array
1250	Longest Common Subsequence
1253	Sort the Matrix Diagonally
1254	Deepest Leaves Sum
1260	Day of the Year
1261	Swap For Longest Repeated Character Substring
1271	Web Crawler
1289	Day of the Week
1297	Maximum Number of Balloons
1298	Reverse Substrings Between Each Pair of Parentheses
1300	Critical Connections in a Network
1304	Longest Happy String
1308	Smallest String With Swaps
1320	Remove All Adjacent Duplicates in String II
1337	Design Skiplist
1348	Maximum Score Of Spliced Array
1352	Maximum Profit in Job Scheduling
1355	Minimum Deletions to Make Array Beautiful
1356	Minimum Number of Moves to Make Palindrome
1360	Maximum Length of a Concatenated String with Unique Characters
1363	Greatest English Letter in Upper and Lower Case
1371	Minimum Remove to Make Valid Parentheses
1380	Number of Closed Islands
1386	Shift 2D Grid
1393	Maximum Value of K Coins From Piles
1396	Count Servers that Communicate
1397	Search Suggestions System
1400	Find Winner on a Tic Tac Toe Game
1402	Count Square Submatrices with All Ones
1414	Shortest Path in a Grid with Obstacles Elimination
1420	Find the Start and End Number of Continuous Ranges
1426	Find N Unique Integers Sum up to Zero
1428	Jump Game III
1437	Minimum Insertion Steps to Make a String Palindrome
1441	Minimum Flips to Make a OR b Equal to c
1442	Number of Operations to Make Network Connected
1444	Number of Steps to Reduce a Number to Zero
1446	Angle Between Hands of a Clock
1449	Print Words Vertically
1451	Minimum Number of Taps to Open to Water a Garden
1465	Maximum Product of Splitted Binary Tree
1473	Find the Longest Substring Containing Vowels in Even Counts
1476	Count Negative Numbers in a Sorted Matrix
1487	Cinema Seat Allocation
1491	Number of Times Binary String Is Prefix-Aligned
1492	Time Needed to Inform All Employees
1504	Get the Second Most Recent Activity
1510	Find Lucky Integer in an Array
1516	The k-th Lexicographical String of All Happy Strings of Length n
1520	Number of Steps to Reduce a Number in Binary Representation to One
1532	Reformat The String
1544	Count Good Nodes in Binary Tree
1560	Number of Students Doing Homework at a Given Time
1569	Max Dot Product of Two Subsequences
1573	Find Two Non-overlapping Sub-arrays Each With Target Sum
1580	Shuffle the Array
1582	Design Browser History
1585	The kth Factor of n
1587	Parallel Courses II
1605	Minimum Number of Days to Make m Bouquets
1609	Find All The Lonely Nodes
1611	Making File Names Unique
1617	Stone Game IV
1618	Delete N Nodes After M Nodes of a Linked List
1630	Count Odd Numbers in an Interval Range
1635	Number of Good Pairs
1637	String Compression II
1642	Water Bottles
1646	Kth Missing Positive Number
1648	Minimum Insertions to Balance a Parentheses String
1649	Maximum Number of Non-Overlapping Subarrays With Sum Equals Target
1651	Shuffle String
1669	Minimum Cost to Cut a Stick
1674	Minimum Operations to Make Array Equal
1678	Number of Ways to Split a String
1698	Replace All ?’s to Avoid Consecutive Repeating Characters
1700	Minimum Time to Make Rope Colorful
1701	Remove Max Number of Edges to Keep Graph Fully Traversable
1706	Min Cost to Connect All Points
1708	Design Parking System
1713	Dot Product of Two Sparse Vectors
1714	Rearrange Spaces Between Words
1738	Maximal Network Rank
1742	Widest Vertical Area Between Two Points Containing No Points
1743	Count Substrings That Differ by One Character
1753	Path With Minimum Effort
1756	Minimum Deletions to Make String Balanced
1762	Furthest Building You Can Reach
1766	Minimum Number of Removals to Make Mountain Array
1770	Minimum Deletions to Make Character Frequencies Unique
1780	Lowest Common Ancestor of a Binary Tree II
1790	Lowest Common Ancestor of a Binary Tree III
1799	Minimum Incompatibility
1801	Average Time of Process per Machine
1802	Number of Students Unable to Eat Lunch
1805	Minimum Adjacent Swaps for K Consecutive Ones
1829	Maximum Units on a Truck
1831	Ways to Split Array Into Three Subarrays
1833	Find the Highest Altitude
1866	Restore the Array From Adjacent Pairs
1873	Longest Nice Substring
1883	Find Distance in a Binary Tree
1894	Merge Strings Alternately
1900	Closest Dessert Cost
1901	Equal Sum Arrays With Minimum Number of Operations
1908	Recyclable and Low Fat Products
1909	Buildings With an Ocean View
1915	Check if One String Swap Can Make Strings Equal
1916	Find Center of Star Graph
1925	Count Nice Pairs in an Array
1929	Maximum Value at a Given Index in a Bounded Array
1936	Maximize Number of Nice Divisors
1950	Sign of the Product of an Array
1951	Find the Winner of the Circular Game
1966	Frequency of the Most Frequent Element
1982	Remove Duplicates From an Unsorted Linked List
1983	Maximum Population Year
2016	Reduction Operations to Make the Array Elements Equal
2031	Egg Drop With 2 Eggs and N Floors
2033	The Number of Full Rounds You Have Played
2076	Sum of Digits of String After Convert
2082	Minimum Cost to Separate Sentence Into Rows
2083	Three Divisors
2095	Minimum Number of Swaps to Make the String Balanced
2114	Minimum Number of Work Sessions to Finish the Tasks
2117	Find Original Array From Doubled Array
2121	Find if Path Exists in Graph
2142	Average Height of Buildings in Each Segment
2155	Find Missing Observations
2162	Partition Array Into Two Arrays to Minimize Sum Difference
2176	Parallel Courses III
2217	Step-By-Step Directions From a Binary Tree Node to Another
2220	Find All Possible Recipes from Given Supplies
2242	Subsequence of Size K With the Largest Even Sum
2243	Check if All A’s Appears Before All B’s
2246	Maximum Employees to Be Invited to a Meeting
2247	Number of Unique Flavors After Sharing K Candies
2255	Minimum Swaps to Group All 1’s Together II
2290	Removing Minimum Number of Magic Beans
2292	Counting Words With a Given Prefix
2299	Merge Nodes in Between Zeros
2308	Divide Array Into Equal Pairs
2310	Minimum Operations to Halve Array Sum
2334	Number of Flowers in Full Bloom
2337	Remove Digit From Number to Maximize Result
2364	Longest Path With Different Adjacent Characters
2383	Add Two Integers
2384	Root Equals Sum of Children
2418	Minimum Sum of Squared Difference
2439	Longest Cycle in a Graph
2453	All the Matches of the League
2461	Amount of Time for Binary Tree to Be Infected
2471	Minimum Amount of Time to Collect Garbage
2473	Max Sum of a Pair With Equal Sum of Digits
2475	Largest Palindromic Number
2487	Optimal Partition of String
2524	Largest Positive Integer That Exists With Its Negative
2568	Minimum Fuel Cost to Report to the Capital
2593	Number of Distinct Binary Strings After Applying Operations
2634	Minimum Common Value
2674	Make the Prefix Sum Non-negative
2693	Maximum Price to Fill a Bag
2720	Minimize the Maximum Difference of Pairs
2756	Buy Two Chocolates
2809	Create Hello World Function
2823	The Knight’s Tour
2902	Max Pair Sum in an Array
3092	Minimum Moves to Spread Stones Over Grid
3111	Smallest Number With Given Digit Product