Interview Question Bank
Access real interview questions from top companies and master them with AI-driven practice.
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Boundary of Binary Tree
Data Structures
Asked at Oracle
Medium
33K Users PracticedPractice with This Question
84.4K views•Recently added
Serialize and Deserialize Binary Tree (Preorder)
Data Structures
Asked at Meta
Hard
71.7K Users PracticedPractice with This Question
25.7K views•Recently added
Remove Invalid Parentheses (BFS)
Data Structures
Asked at Google
Hard
21.8K Users PracticedPractice with This Question
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Find Duplicate Subtrees (Postorder & Map)
Data Structures
Asked at Microsoft
Hard
97.9K Users PracticedPractice with This Question
88.6K views•Recently added
Flatten Binary Tree to Linked List (In-place)
Data Structures
Asked at Amazon
Medium
75.3K Users PracticedPractice with This Question
77.8K views•Recently added
Design a Bloom Filter (Conceptual)
Data Structures
Asked at Stripe
Hard
66.1K Users PracticedPractice with This Question
103K views•Recently added
Design a Set of Stacks with `popAt`
Data Structures
Asked at Adobe
Hard
87.5K Users PracticedPractice with This Question
131.5K views•Recently added
Find the Town Judge (Array/Map)
Data Structures
Asked at LinkedIn
Easy
111.8K Users PracticedPractice with This Question
68.5K views•Recently added
Implement a Graph (Adjacency Matrix)
Data Structures
Asked at Airbnb
Medium
58.3K Users PracticedPractice with This Question
58.2K views•Recently added
Design a Stock Price Fluctuation Tracker
Data Structures
Asked at Spotify
Medium
49.4K Users PracticedPractice with This Question