Dashboard Questions Topics Companies Sheets

Oracle Interview Questions

136 coding problems asked in Oracle interviews. Prepare for your technical interview with real questions.

136

Problems

Easy

Medium

Hard

Difficulty

All136 Easy26 Medium84 Hard26

Title	Solve	Difficulty	Companies	Topics
168. Excel Sheet Column Title	Solve	Easy	Adobe+24	Math String
172. Factorial Trailing Zeroes	Solve	Medium	Amazon+1	Math
176. Second Highest Salary	Solve	Medium	Accenture+10	Database
179. Largest Number	Solve	Medium	Adobe+8	Array Greedy+2
191. Number of 1 Bits	Solve	Easy	Amazon+6	Bit Manipulation Divide and Conquer
196. Delete Duplicate Emails	Solve	Easy	Amazon+3	Database
199. Binary Tree Right Side View	Solve	Medium	Amazon+8	Binary Tree Breadth-First Search+2
200. Number of Islands	Solve	Medium	Adobe+40	Array Breadth-First Search+3
207. Course Schedule	Solve	Medium	Amazon+8	Breadth-First Search Depth-First Search+2
208. Implement Trie (Prefix Tree)	Solve	Medium	Amazon+8	Design Hash Table+2
215. Kth Largest Element in an Array	Solve	Medium	ABCO+44	Array Divide and Conquer+3
225. Implement Stack using Queues	Solve	Easy	Accenture+54	Design Queue+1
227. Basic Calculator II	Solve	Medium	Amazon+9	Math Stack+1
236. Lowest Common Ancestor of a Binary Tree	Solve	Medium	Amazon+9	Binary Tree Depth-First Search+1
238. Product of Array Except Self	Solve	Medium	Adobe+8	Array Prefix Sum
239. Sliding Window Maximum	Solve	Hard	Accion Labs India+66	Array Heap (Priority Queue)+3
240. Search a 2D Matrix II	Solve	Medium	Amazon+5	Array Binary Search+2
253. Meeting Rooms II	Solve	Medium	Amazon+8	Array Greedy+4
255. Verify Preorder Sequence in Binary Search Tree	Solve	Medium	Oracle+2	Array Binary Search Tree+5
295. Find Median from Data Stream	Solve	Hard	Adobe+33	Data Stream Design+3
297. Serialize and Deserialize Binary Tree	Solve	Hard	Amazon+8	Binary Tree Breadth-First Search+4
300. Longest Increasing Subsequence	Solve	Medium	Accenture+78	Array Binary Search+1
316. Remove Duplicate Letters	Solve	Medium	Amazon+6	Greedy Monotonic Stack+2
333. Largest BST Subtree	Solve	Medium	Cohesity+2	Binary Search Tree Binary Tree+3
347. Top K Frequent Elements	Solve	Medium	Adobe+9	Array Bucket Sort+6
387. First Unique Character in a String	Solve	Easy	Amazon+8	Counting Hash Table+2
394. Decode String	Solve	Medium	Adobe+16	Recursion Stack+1
403. Frog Jump	Solve	Hard	Adobe+21	Array Dynamic Programming
415. Add Strings	Solve	Easy	Amazon+7	Math Simulation+1
430. Flatten a Multilevel Doubly Linked List	Solve	Medium	Amazon+3	Depth-First Search Doubly-Linked List+1
435. Non-overlapping Intervals	Solve	Medium	Amazon+7	Array Dynamic Programming+2
438. Find All Anagrams in a String	Solve	Medium	Adobe+9	Hash Table Sliding Window+1
445. Add Two Numbers II	Solve	Medium	Accenture+49	Linked List Math+1
450. Delete Node in a BST	Solve	Medium	Amazon+4	Binary Search Tree Binary Tree+1
460. LFU Cache	Solve	Hard	Amazon+9	Design Doubly-Linked List+2
509. Fibonacci Number	Solve	Easy	Adobe+8	Dynamic Programming Math+2
516. Longest Palindromic Subsequence	Solve	Medium	Amazon+5	Dynamic Programming String
518. Coin Change II	Solve	Medium	Accenture+68	Array Dynamic Programming
560. Subarray Sum Equals K	Solve	Medium	Adobe+15	Array Hash Table+1
564. Find the Closest Palindrome	Solve	Hard	Amazon+5	Math String
567. Permutation in String	Solve	Medium	Amazon+7	Hash Table Sliding Window+2
599. Minimum Index Sum of Two Lists	Solve	Easy	Apple+2	Array Hash Table+1
658. Find K Closest Elements	Solve	Medium	Amazon+6	Array Binary Search+4
680. Valid Palindrome II	Solve	Easy	Amazon+6	Greedy String+1
695. Max Area of Island	Solve	Medium	Amazon+8	Array Breadth-First Search+3
696. Count Binary Substrings	Solve	Easy	Adobe+8	String Two Pointers
706. Design HashMap	Solve	Easy	Adobe+26	Array Design+3
715. Range Module	Solve	Hard	Amazon+6	Design Ordered Set+1
725. Split Linked List in Parts	Solve	Medium	Amazon+3	Linked List
735. Asteroid Collision	Solve	Medium	Amazon+15	Array Simulation+1