Question 1

Design SQL — OpenAI Interview Question

Accepted Answer

"Design SQL" is a medium difficulty problem asked at OpenAI interviews. It covers the following topics: Array, Hash Table, String, Design. You can practice it on LeetCode: https://leetcode.com/problems/design-sql

Question 2

Flatten Nested List Iterator — OpenAI Interview Question

Accepted Answer

"Flatten Nested List Iterator" is a medium difficulty problem asked at OpenAI interviews. It covers the following topics: Stack, Tree, Depth-First Search, Design, Queue, Iterator. You can practice it on LeetCode: https://leetcode.com/problems/flatten-nested-list-iterator

Question 3

Design Excel Sum Formula — OpenAI Interview Question

Accepted Answer

"Design Excel Sum Formula" is a hard difficulty problem asked at OpenAI interviews. It covers the following topics: Array, Hash Table, String, Graph, Design, Topological Sort, Matrix. You can practice it on LeetCode: https://leetcode.com/problems/design-excel-sum-formula

Question 4

Time Based Key-Value Store — OpenAI Interview Question

Accepted Answer

"Time Based Key-Value Store" is a medium difficulty problem asked at OpenAI interviews. It covers the following topics: Hash Table, String, Binary Search, Design. You can practice it on LeetCode: https://leetcode.com/problems/time-based-key-value-store

Question 5

Web Crawler Multithreaded — OpenAI Interview Question

Accepted Answer

"Web Crawler Multithreaded" is a medium difficulty problem asked at OpenAI interviews. It covers the following topics: Depth-First Search, Breadth-First Search, Concurrency. You can practice it on LeetCode: https://leetcode.com/problems/web-crawler-multithreaded

Question 6

Design Memory Allocator — OpenAI Interview Question

Accepted Answer

"Design Memory Allocator" is a medium difficulty problem asked at OpenAI interviews. It covers the following topics: Array, Hash Table, Design, Simulation. You can practice it on LeetCode: https://leetcode.com/problems/design-memory-allocator

#	Question Title	Difficulty	Frequency	Topics
1	Design SQL	MEDIUM	100.0	ArrayHash TableString+1
2	Flatten Nested List Iterator	MEDIUM	85.4	StackTreeDepth-First Search+3
3	Design Excel Sum Formula	HARD	75.4	ArrayHash TableString+4
4	Time Based Key-Value Store	MEDIUM	71.8	Hash TableStringBinary Search+1
5	Web Crawler Multithreaded	MEDIUM	67.5	Depth-First SearchBreadth-First SearchConcurrency
6	Design Memory Allocator	MEDIUM	61.8	ArrayHash TableDesign+1
7	Simplify Path	MEDIUM	53.9	StringStack
8	Flood Fill	EASY	53.9	ArrayDepth-First SearchBreadth-First Search+1
9	Encode and Decode Strings	MEDIUM	53.9	ArrayStringDesign
10	Largest Local Values in a Matrix	EASY	53.9	ArrayMatrix

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