Interview Questions

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6,535 questions
548 companies
49 roles
Last updated Nov 2026

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Write a class that returns a random stock from a list so that no stock repeats until every stock has been returned once, and that supports adding and removing stocks.
6 years ago
Given daily prices, return every buy day and sell day that captures each rising run.
5 years ago
Count the subarrays arr[i..j] where arr[i] and arr[j] both equal the sum of the elements strictly between them.
3 years ago
Count the submatrices of a matrix whose elements sum to zero.
5 years ago
Each of n students states how many students scored less than them and how many scored more. Find the maximum number of students who can be telling the truth.
6 years ago
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Players move right along a line toward an endpoint while a watcher freezes any player in its line of sight and flips direction at given times. How many players reach the end by time T?
17 hours ago
Given an arithmetic expression string such as '1+2-3*4', compute every result obtainable by parenthesising it in different ways.
17 hours ago
Given source and destination directory listings, return the files that must be synced: those missing at the destination or differing in size or modification time.
10 months ago
How does std::unordered_map work internally?
2 years ago
How does a computer do two things at once?
3 years ago
Implement an exchange matching engine.
+210 months ago
Given a tree of objects in which parents and children carry hashes, compute the hashes with a depth-first traversal.
10 months ago
Design a trading system with event streaming.
10 months ago
Design a Connect-7 game using object-oriented design.
2 years ago
Explain parallelism in computer science.
2 years ago
Implement a threaded producer-consumer queue, first with a mutex, then optimised with a spin lock; analyse memory ordering and then improve it with a lock-free approach.
17 hours ago
Implement an order book across exchanges with add(exchange, price, quantity, side), the best bid and ask on one exchange, and the best bid and ask across all of them.
17 hours ago
How do you implement a unique pointer (std::unique_ptr)?
2 years ago
Design a market data feed from multiple venues to centralised strategies.
10 months ago
How are collisions handled in a separate-chaining hash map? What is the difference between multiprocessing and multithreading?
3 years ago

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Interview Questions

Write a class that returns a random stock from a list so that no stock repeats until every stock has been returned once, and that supports adding and removing stocks.

Given daily prices, return every buy day and sell day that captures each rising run.

Count the subarrays arr[i..j] where arr[i] and arr[j] both equal the sum of the elements strictly between them.

Count the submatrices of a matrix whose elements sum to zero.

Each of n students states how many students scored less than them and how many scored more. Find the maximum number of students who can be telling the truth.

Players move right along a line toward an endpoint while a watcher freezes any player in its line of sight and flips direction at given times. How many players reach the end by time T?

Given an arithmetic expression string such as '1+2-3*4', compute every result obtainable by parenthesising it in different ways.

Given source and destination directory listings, return the files that must be synced: those missing at the destination or differing in size or modification time.

How does std::unordered_map work internally?

How does a computer do two things at once?

Implement an exchange matching engine.

Given a tree of objects in which parents and children carry hashes, compute the hashes with a depth-first traversal.

Design a trading system with event streaming.

Design a Connect-7 game using object-oriented design.

Explain parallelism in computer science.

Implement a threaded producer-consumer queue, first with a mutex, then optimised with a spin lock; analyse memory ordering and then improve it with a lock-free approach.

Implement an order book across exchanges with add(exchange, price, quantity, side), the best bid and ask on one exchange, and the best bid and ask across all of them.

How do you implement a unique pointer (std::unique_ptr)?

Design a market data feed from multiple venues to centralised strategies.

How are collisions handled in a separate-chaining hash map? What is the difference between multiprocessing and multithreading?

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