Interview Questions

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

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Interview Questions

Compare a numpy array with a Python list in terms of efficiency, initialisation and memory use.

Implement the move logic of the game 2048: slide and merge the tiles of a grid in each of the four directions.

You get a compressed archive of log files and must report how many entries failed and how many nearly failed, with no status field. How do you explore, define failure and count?

Someone has two children and you learn that one of them is a boy. What is the probability the other is also a boy? What if you learn that one is a boy born on a Tuesday?

Which machine learning methods have you used, and what are their pros and cons? What are ensemble methods, and how do boosted tree methods work?

You have 1000 dollars to bet at even money on a coin that lands heads with known probability p. What stake maximises expected log wealth?

What is the difference between a mutex and a semaphore? What does the ESP register hold?

What is an interrupt, and what is a system call? In the Linux kernel, what is the difference between the irqsave and irq variants of the interrupt-disabling calls?

What is the difference between TCP and UDP?

A substring is balanced when every letter in it appears the same number of times. Given a string of lowercase letters, find the length of the longest balanced substring.

Find the K smallest elements of an array.

In how many ways can you climb n stairs if each step goes up 1 or 2 stairs? What is the time complexity of computing that count by plain recursion?

What are the trade-offs between templates and inheritance (static versus dynamic polymorphism)?

Explain what std::forward<Args>(args)... does inside emplace_back.

In a hand-written vector you allocate with static_cast<T>(::operator new(n sizeof(T))). How does that differ from simply writing new T (or new T[n])?

You can ask random students how big their class is, but not which class. How do you estimate the average class size?

Explain how Python implements dictionaries.

Given a non-negative integer, return the largest number that can be formed by rearranging its digits. Example: 318 gives 831.

An N by N matrix has a 1 at (i, j) when students i and j are direct friends. A friend circle is a group linked by direct or indirect friendship. Count the friend circles.

Given a string of lowercase English letters, count the ways to add one letter to it so that the result is a permutation of some palindrome.

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