Previous Questions

Uber

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
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
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
45	Jump Game II
46	Permutations
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
62	Unique Paths
63	Unique Paths II
64	Minimum Path Sum
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
78	Subsets
79	Word Search
81	Search in Rotated Sorted Array II
83	Remove Duplicates from Sorted List
84	Largest Rectangle in Histogram
88	Merge Sorted Array
90	Subsets II
91	Decode Ways
94	Binary Tree Inorder Traversal
95	Unique Binary Search Trees II
97	Interleaving String
98	Validate Binary Search Tree
101	Symmetric Tree
102	Binary Tree Level Order Traversal
104	Maximum Depth of Binary Tree
105	Construct Binary Tree from Preorder and Inorder Traversal
110	Balanced Binary Tree
111	Minimum Depth of Binary Tree
112	Path Sum
118	Pascal’s Triangle
121	Best Time to Buy and Sell Stock
122	Best Time to Buy and Sell Stock II
123	Best Time to Buy and Sell Stock III
124	Binary Tree Maximum Path Sum
125	Valid Palindrome
127	Word Ladder
128	Longest Consecutive Sequence
131	Palindrome Partitioning
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
143	Reorder List
146	LRU Cache
149	Max Points on a Line
151	Reverse Words in a String
152	Maximum Product Subarray
153	Find Minimum in Rotated Sorted Array
155	Min Stack
160	Intersection of Two Linked Lists
161	One Edit Distance
162	Find Peak Element
163	Missing Ranges
167	Two Sum II - Input Array Is Sorted
169	Majority Element
171	Excel Sheet Column Number
174	Dungeon Game
177	Nth Highest Salary
178	Rank Scores
179	Largest Number
180	Consecutive Numbers
181	Employees Earning More Than Their Managers
182	Duplicate Emails
186	Reverse Words in a String II
188	Best Time to Buy and Sell Stock IV
189	Rotate Array
196	Delete Duplicate Emails
199	Binary Tree Right Side View
200	Number of Islands
202	Happy Number
205	Isomorphic Strings
206	Reverse Linked List
207	Course Schedule
208	Implement Trie (Prefix Tree)
210	Course Schedule II
212	Word Search II
214	Shortest Palindrome
215	Kth Largest Element in an Array
217	Contains Duplicate
218	The Skyline Problem
219	Contains Duplicate II
221	Maximal Square
224	Basic Calculator
226	Invert Binary Tree
227	Basic Calculator II
229	Majority Element II
230	Kth Smallest Element in a BST
231	Power of Two
234	Palindrome Linked List
235	Lowest Common Ancestor of a Binary Search Tree
238	Product of Array Except Self
239	Sliding Window Maximum
242	Valid Anagram
246	Strobogrammatic Number
247	Strobogrammatic Number II
249	Group Shifted Strings
253	Meeting Rooms II
254	Factor Combinations
262	Trips and Users
266	Palindrome Permutation
267	Palindrome Permutation II
268	Missing Number
269	Alien Dictionary
278	First Bad Version
279	Perfect Squares
283	Move Zeroes
287	Find the Duplicate Number
290	Word Pattern
291	Word Pattern II
295	Find Median from Data Stream
297	Serialize and Deserialize Binary Tree
301	Remove Invalid Parentheses
304	Range Sum Query 2D - Immutable
305	Number of Islands II
310	Minimum Height Trees
312	Burst Balloons
322	Coin Change
328	Odd Even Linked List
329	Longest Increasing Path in a Matrix
332	Reconstruct Itinerary
337	House Robber III
341	Flatten Nested List Iterator
343	Integer Break
345	Reverse Vowels of a String
347	Top K Frequent Elements
350	Intersection of Two Arrays II
354	Russian Doll Envelopes
355	Design Twitter
358	Rearrange String k Distance Apart
361	Bomb Enemy
362	Design Hit Counter
373	Find K Pairs with Smallest Sums
374	Guess Number Higher or Lower
378	Kth Smallest Element in a Sorted Matrix
380	Insert Delete GetRandom O(1)
384	Shuffle an Array
387	First Unique Character in a String
392	Is Subsequence
394	Decode String
399	Evaluate Division
402	Remove K Digits
408	Valid Word Abbreviation
412	Fizz Buzz
414	Third Maximum Number
416	Partition Equal Subset Sum
417	Pacific Atlantic Water Flow
424	Longest Repeating Character Replacement
432	All O`one Data Structure
438	Find All Anagrams in a String
443	String Compression
450	Delete Node in a BST
452	Minimum Number of Arrows to Burst Balloons
460	LFU Cache
465	Optimal Account Balancing
473	Matchsticks to Square
474	Ones and Zeroes
486	Predict the Winner
490	The Maze
494	Target Sum
496	Next Greater Element I
502	IPO
516	Longest Palindromic Subsequence
518	Coin Change II
525	Contiguous Array
529	Minesweeper
532	K-diff Pairs in an Array
535	Encode and Decode TinyURL
540	Single Element in a Sorted Array
541	Reverse String II
543	Diameter of Binary Tree
545	Boundary of Binary Tree
560	Subarray Sum Equals K
564	Find the Closest Palindrome
572	Subtree of Another Tree
581	Shortest Unsorted Continuous Subarray
586	Customer Placing the Largest Number of Orders
588	Design In-Memory File System
605	Can Place Flowers
608	Tree Node
617	Merge Two Binary Trees
621	Task Scheduler
636	Exclusive Time of Functions
648	Replace Words
653	Two Sum IV - Input is a BST
658	Find K Closest Elements
662	Maximum Width of Binary Tree
680	Valid Palindrome II
682	Baseball Game
690	Employee Importance
692	Top K Frequent Words
695	Max Area of Island
698	Partition to K Equal Sum Subsets
699	Falling Squares
715	Range Module
721	Accounts Merge
722	Remove Comments
723	Candy Crush
724	Find Pivot Index
725	Split Linked List in Parts
729	My Calendar I
731	My Calendar II
733	Flood Fill
735	Asteroid Collision
737	Sentence Similarity II
739	Daily Temperatures
740	Delete and Earn
741	Cherry Pickup
747	Min Cost Climbing Stairs
753	Open the Lock
761	Employee Free Time
765	Serialize and Deserialize N-ary Tree
768	Partition Labels
772	Construct Quad Tree
778	Reorganize String
785	Basic Calculator III
787	Sliding Puzzle
789	Kth Largest Element in a Stream
792	Binary Search
794	Swim in Rising Water
796	Reaching Points
801	Is Graph Bipartite?
815	Champagne Tower
833	Bus Routes
835	Linked List Components
854	Making A Large Island
877	Shortest Path Visiting All Nodes
879	Maximize Distance to Closest Person
881	Loud and Rich
882	Peak Index in a Mountain Array
885	Exam Room
893	All Nodes Distance K in Binary Tree
894	Random Pick with Blacklist
895	Shortest Path to Get All Keys
907	Koko Eating Bananas
908	Middle of the Linked List
912	Random Pick with Weight
917	Boats to Save People
922	Possible Bipartition
938	Numbers At Most N Given Digit Set
948	Sort an Array
957	Minimum Add to Make Parentheses Valid
966	Binary Subarrays With Sum
971	Shortest Bridge
978	Valid Mountain Array
990	Verifying an Alien Dictionary
999	Regions Cut By Slashes
1019	Squares of a Sorted Array
1023	Time Based Key-Value Store
1028	Interval List Intersections
1029	Vertical Order Traversal of a Binary Tree
1034	Subarrays with K Different Integers
1036	Rotting Oranges
1044	Find Common Characters
1050	Construct Binary Search Tree from Preorder Traversal
1056	Capacity To Ship Packages Within D Days
1060	Longest Repeating Substring
1066	Fixed Point
1086	Divisor Game
1087	Longest Arithmetic Subsequence
1101	Parallel Courses
1107	Minimum Swaps to Group All 1’s Together
1108	Analyze User Website Visit Pattern
1111	Minimum Score Triangulation of Polygon
1122	Longest Duplicate Substring
1127	Last Stone Weight
1170	Shortest Common Supersequence
1185	Find in Mountain Array
1197	Parsing A Boolean Expression
1211	Iterator for Combination
1240	Stone Game II
1250	Longest Common Subsequence
1252	Break a Palindrome
1267	Remove Zero Sum Consecutive Nodes from Linked List
1306	Minimum Absolute Difference
1352	Maximum Profit in Job Scheduling
1360	Maximum Length of a Concatenated String with Unique Characters
1374	Leftmost Column with at Least a One
1406	Subtract the Product and Sum of Digits of an Integer
1411	Convert Binary Number in a Linked List to Integer
1414	Shortest Path in a Grid with Obstacles Elimination
1444	Number of Steps to Reduce a Number to Zero
1446	Angle Between Hands of a Clock
1451	Minimum Number of Taps to Open to Water a Garden
1456	Find the City With the Smallest Number of Neighbors at a Threshold Distance
1457	Minimum Difficulty of a Job Schedule
1474	Longest ZigZag Path in a Binary Tree
1476	Count Negative Numbers in a Sorted Matrix
1478	Maximum Number of Events That Can Be Attended
1486	Find the Distance Value Between Two Arrays
1502	Construct K Palindrome Strings
1503	Reducing Dishes
1505	Create Target Array in the Given Order
1528	Kids With the Greatest Number of Candies
1538	Maximum Points You Can Obtain from Cards
1549	Longest Continuous Subarray With Absolute Diff Less Than or Equal to Limit
1558	Course Schedule IV
1603	Running Sum of 1d Array
1635	Number of Good Pairs
1637	String Compression II
1638	Best Position for a Service Centre
1643	Number of Nodes in the Sub-Tree With the Same Label
1701	Remove Max Number of Edges to Keep Graph Fully Traversable
1706	Min Cost to Connect All Points
1708	Design Parking System
1734	Bank Account Summary II
1741	Sort Array by Increasing Frequency
1753	Path With Minimum Effort
1779	Hopper Company Queries I
1785	Hopper Company Queries II
1795	Hopper Company Queries III
1802	Number of Students Unable to Eat Lunch
1820	Number Of Ways To Reconstruct A Tree
1824	Maximum Number of Eaten Apples
1866	Restore the Array From Adjacent Pairs
1878	Check if Array Is Sorted and Rotated
1881	Closest Subsequence Sum
1883	Find Distance in a Binary Tree
1894	Merge Strings Alternately
1909	Buildings With an Ocean View
1925	Count Nice Pairs in an Array
1940	Maximum XOR for Each Query
1946	Minimum Absolute Sum Difference
1966	Frequency of the Most Frequent Element
1972	Rotating the Box
1985	Maximum Subarray Min-Product
1990	Get Biggest Three Rhombus Sums in a Grid
1997	Next Palindrome Using Same Digits
2038	Nearest Exit from Entrance in Maze
2058	Concatenation of Array
2065	Check for Contradictions in Equations
2072	Maximum of Minimum Values in All Subarrays
2085	Array With Elements Not Equal to Average of Neighbors
2093	Check If String Is a Prefix of Array
2099	Number of Strings That Appear as Substrings in Word
2119	Minimum Number of Operations to Make Array Continuous
2133	Number of Pairs of Strings With Concatenation Equal to Target
2162	Partition Array Into Two Arrays to Minimize Sum Difference
2220	Find All Possible Recipes from Given Supplies
2246	Maximum Employees to Be Invited to a Meeting
2255	Minimum Swaps to Group All 1’s Together II
2267	Minimum Difference in Sums After Removal of Elements
2271	Rearrange Array Elements by Sign
2277	Count Equal and Divisible Pairs in an Array
2294	Minimum Time to Complete Trips
2297	Amount of New Area Painted Each Day
2306	Create Binary Tree From Descriptions
2331	Intersection of Multiple Arrays
2334	Number of Flowers in Full Bloom
2339	K Divisible Elements Subarrays
2344	Escape the Spreading Fire
2361	Calculate Digit Sum of a String
2383	Add Two Integers
2418	Minimum Sum of Squared Difference
2425	Number of People That Can Be Seen in a Grid
2479	Meeting Rooms III
2563	Split Message Based on Limit
2583	Divide Nodes Into the Maximum Number of Groups
2673	Maximize Win From Two Segments
2681	Put Marbles in Bags
2717	Collect Coins in a Tree
2755	Extra Characters in a String
2809	Create Hello World Function
2977	Check if a String Is an Acronym of Words
3034	Points That Intersect With Cars
3198	Number of Ways to Reach Destination in the Grid