Previous Questions

Oracle

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
10	Regular Expression Matching
11	Container With Most Water
12	Integer to Roman
13	Roman to Integer
14	Longest Common Prefix
15	3Sum
17	Letter Combinations of a Phone Number
19	Remove Nth Node From End of List
20	Valid Parentheses
21	Merge Two Sorted Lists
22	Generate Parentheses
23	Merge k Sorted Lists
26	Remove Duplicates from Sorted Array
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
36	Valid Sudoku
37	Sudoku Solver
39	Combination Sum
40	Combination Sum II
41	First Missing Positive
42	Trapping Rain Water
45	Jump Game II
48	Rotate Image
49	Group Anagrams
50	Pow(x, n)
53	Maximum Subarray
54	Spiral Matrix
55	Jump Game
56	Merge Intervals
57	Insert Interval
61	Rotate List
63	Unique Paths II
64	Minimum Path Sum
70	Climbing Stairs
71	Simplify Path
73	Set Matrix Zeroes
74	Search a 2D Matrix
75	Sort Colors
76	Minimum Window Substring
78	Subsets
79	Word Search
88	Merge Sorted Array
91	Decode Ways
93	Restore IP Addresses
98	Validate Binary Search Tree
99	Recover Binary Search Tree
102	Binary Tree Level Order Traversal
103	Binary Tree Zigzag Level Order Traversal
108	Convert Sorted Array to Binary Search Tree
116	Populating Next Right Pointers in Each Node
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
134	Gas Station
138	Copy List with Random Pointer
139	Word Break
140	Word Break II
141	Linked List Cycle
146	LRU Cache
148	Sort List
149	Max Points on a Line
150	Evaluate Reverse Polish Notation
153	Find Minimum in Rotated Sorted Array
155	Min Stack
160	Intersection of Two Linked Lists
165	Compare Version Numbers
168	Excel Sheet Column Title
176	Second Highest Salary
179	Largest Number
196	Delete Duplicate Emails
199	Binary Tree Right Side View
200	Number of Islands
205	Isomorphic Strings
206	Reverse Linked List
207	Course Schedule
208	Implement Trie (Prefix Tree)
209	Minimum Size Subarray Sum
215	Kth Largest Element in an Array
217	Contains Duplicate
221	Maximal Square
225	Implement Stack using Queues
226	Invert Binary Tree
227	Basic Calculator II
232	Implement Queue using Stacks
234	Palindrome Linked List
235	Lowest Common Ancestor of a Binary Search Tree
236	Lowest Common Ancestor of a Binary Tree
238	Product of Array Except Self
239	Sliding Window Maximum
240	Search a 2D Matrix II
243	Shortest Word Distance
252	Meeting Rooms
253	Meeting Rooms II
268	Missing Number
273	Integer to English Words
279	Perfect Squares
283	Move Zeroes
297	Serialize and Deserialize Binary Tree
300	Longest Increasing Subsequence
314	Binary Tree Vertical Order Traversal
316	Remove Duplicate Letters
328	Odd Even Linked List
329	Longest Increasing Path in a Matrix
333	Largest BST Subtree
347	Top K Frequent Elements
348	Design Tic-Tac-Toe
359	Logger Rate Limiter
378	Kth Smallest Element in a Sorted Matrix
380	Insert Delete GetRandom O(1)
387	First Unique Character in a String
394	Decode String
412	Fizz Buzz
414	Third Maximum Number
415	Add Strings
425	Word Squares
438	Find All Anagrams in a String
443	String Compression
445	Add Two Numbers II
450	Delete Node in a BST
453	Minimum Moves to Equal Array Elements
460	LFU Cache
463	Island Perimeter
468	Validate IP Address
516	Longest Palindromic Subsequence
540	Single Element in a Sorted Array
543	Diameter of Binary Tree
560	Subarray Sum Equals K
564	Find the Closest Palindrome
567	Permutation in String
588	Design In-Memory File System
658	Find K Closest Elements
680	Valid Palindrome II
694	Number of Distinct Islands
696	Count Binary Substrings
697	Degree of an Array
715	Range Module
735	Asteroid Collision
761	Employee Free Time
766	Flatten a Multilevel Doubly Linked List
778	Reorganize String
792	Binary Search
803	Cheapest Flights Within K Stops
812	Rotate String
817	Design HashMap
832	Binary Tree Pruning
866	Rectangle Overlap
874	Backspace String Compare
878	Shifting Letters
908	Middle of the Linked List
971	Shortest Bridge
1013	Fibonacci Number
1014	K Closest Points to Origin
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
1050	Construct Binary Search Tree from Preorder Traversal
1055	Pairs of Songs With Total Durations Divisible by 60
1056	Capacity To Ship Packages Within D Days
1116	Maximum Level Sum of a Binary Tree
1128	Remove All Adjacent Duplicates In String
1129	Longest String Chain
1159	Smallest Subsequence of Distinct Characters
1171	Shortest Path in Binary Matrix
1308	Smallest String With Swaps
1352	Maximum Profit in Job Scheduling
1397	Search Suggestions System
1411	Convert Binary Number in a Linked List to Integer
1431	All Ancestors of a Node in a Directed Acyclic Graph
1451	Minimum Number of Taps to Open to Water a Garden
1496	Lucky Numbers in a Matrix
1510	Find Lucky Integer in an Array
1526	HTML Entity Parser
1582	Design Browser History
1732	Minimum One Bit Operations to Make Integers Zero
1741	Sort Array by Increasing Frequency
1851	Maximum Number of Events That Can Be Attended II
1883	Find Distance in a Binary Tree
1909	Buildings With an Ocean View
1929	Maximum Value at a Given Index in a Bounded Array
2115	Number of Unique Good Subsequences
2116	Count Number of Pairs With Absolute Difference K
2527	Count Subarrays With Fixed Bounds
2530	Minimize Maximum of Array
2559	Maximum Number of Non-overlapping Palindrome Substrings
2562	Count Ways To Build Good Strings
2594	Count Pairs Of Similar Strings
2651	Count Ways to Group Overlapping Ranges
2679	Count Distinct Numbers on Board
2683	Count the Number of Good Subsequences
2689	Rearranging Fruits
3032	Maximize Value of Function in a Ball Passing Game