Interview Questions

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

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Re-root a binary tree.
3 years ago
Code a thread-safe queue in C++.
4 years ago
Find an arbitrage in a set of currency exchange rates.
4 years ago
after[x][y] is the sum of before[i][j] over all i <= x and j <= y. Given the after matrix, recover before.
17 hours ago
Each input line pairs two students, one of whom copied from the other. Output every group of students linked by copying, sorted within each group and ordered by smallest roll number.
17 hours ago
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Create a copy of a binary tree in which each node has an extra random pointer to any node.
17 hours ago
Write an efficient implementation of a lazily initialised singleton in C++.
17 hours ago
Two fair six-sided dice are rolled. What is the probability that they total 8?
2 years ago
A fair six-sided die is about to be rolled. Make a market on the number it shows.
6 years ago
Given an array and queries (index, value), add value at the index, value-1 to each neighbour, value-2 to the next ones, and so on until the increment reaches zero. Output the final array.
4 years ago
What does neutralisation do to an alpha?
3 years ago
Given arrays A and B, build C with C[i] chosen from A[i] or B[i] so that the smallest missing positive integer of C is as small as possible, and return it.
5 years ago
A fair coin is flipped repeatedly. How many flips do you expect to need before you see three heads in a row?
17 hours ago
What is the purpose of std::enable_if? Why might you use an enumeration instead of an integer in C++17?
17 hours ago
A string of brackets has exactly one more of one type than the other. Count the positions where inserting one bracket of the missing type makes the string balanced.
5 years ago
Implement a Bloom filter.
5 years ago
A read from main memory is a mov from an address to a register. Describe everything the CPU does on that mov and which parts of the CPU are involved.
5 years ago
How would you design a Parquet-like columnar file format?
10 months ago
Count the occurrences of a word along straight lines in a grid of characters.
10 months ago
Given an array of daily prices, find the maximum profit from one buy followed by one sell.
17 hours ago

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Interview Questions

Re-root a binary tree.

Code a thread-safe queue in C++.

Find an arbitrage in a set of currency exchange rates.

after[x][y] is the sum of before[i][j] over all i <= x and j <= y. Given the after matrix, recover before.

Each input line pairs two students, one of whom copied from the other. Output every group of students linked by copying, sorted within each group and ordered by smallest roll number.

Create a copy of a binary tree in which each node has an extra random pointer to any node.

Write an efficient implementation of a lazily initialised singleton in C++.

Two fair six-sided dice are rolled. What is the probability that they total 8?

A fair six-sided die is about to be rolled. Make a market on the number it shows.

Given an array and queries (index, value), add value at the index, value-1 to each neighbour, value-2 to the next ones, and so on until the increment reaches zero. Output the final array.

What does neutralisation do to an alpha?

Given arrays A and B, build C with C[i] chosen from A[i] or B[i] so that the smallest missing positive integer of C is as small as possible, and return it.

A fair coin is flipped repeatedly. How many flips do you expect to need before you see three heads in a row?

What is the purpose of std::enable_if? Why might you use an enumeration instead of an integer in C++17?

A string of brackets has exactly one more of one type than the other. Count the positions where inserting one bracket of the missing type makes the string balanced.

Implement a Bloom filter.

A read from main memory is a mov from an address to a register. Describe everything the CPU does on that mov and which parts of the CPU are involved.

How would you design a Parquet-like columnar file format?

Count the occurrences of a word along straight lines in a grid of characters.

Given an array of daily prices, find the maximum profit from one buy followed by one sell.

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