Interview Questions

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548 companies
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Last updated Nov 2026

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Alex and Blake each flip a coin until they get their first heads. Given that Alex needed fewer flips than Blake, what is Alex's expected number of flips?
2 years ago
20-sided die, 100 rounds: each round either roll, or take the face value in dollars, after which the die is removed until you spend a round rolling again. How should you play?
17 hours ago
How many prime numbers are there from 1 to 999?
10 months ago
What are L1 and L2 regularisation, and when would you use each?
+117 hours ago
Which exchanges do you trade on?
2 years ago
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Suppose you can forecast an external shock before it happens. How would you turn that forecast into an alpha?
2 years ago
What is an alpha? What is a net long-short alpha?
2 years ago
A stick is cut at two random points, giving three pieces. What is the probability that the three pieces can form a triangle?
17 hours ago
In an array every element is at most k positions away from where it belongs in sorted order. What is the fastest way to sort it?
+117 hours ago
How many times in one day are the second hand and the minute hand of a clock perpendicular to each other?
4 years ago
Financial text often covers several companies at once. How would you find the main companies, extract the passages about each, and strip boilerplate?
2 years ago
What is the expected number of inversions in a uniformly random permutation of n elements?
2 years ago
Given an integer n, return how many integers less than n can be written in base 4 using only the digits 0 and 1.
10 months ago
Four hidden cards (60, -40, -20, 0), one in the opponent's pocket: walk away, take the pocket card, or pay $6 to peek at a table card. What is the optimal strategy?
10 months ago
You roll a die until the running sum exceeds 63. What is the distribution of the last running sum that was still at most 63?
17 hours ago
Array A holds m sorted values followed by n empty slots, and array B holds n sorted values. Merge B into A in place so that A is sorted.
17 hours ago
R red balls and B black balls are arranged in a random order in a row. What is the expected number of colour changes along the row?
3 years ago
The data set is too large to load into memory and you want to run a linear regression. What can you do?
17 hours ago
Write down the complete-data log likelihood of a hidden Markov model.
17 hours ago
Implement k-means in C++.
17 hours ago

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Interview Questions

Alex and Blake each flip a coin until they get their first heads. Given that Alex needed fewer flips than Blake, what is Alex's expected number of flips?

20-sided die, 100 rounds: each round either roll, or take the face value in dollars, after which the die is removed until you spend a round rolling again. How should you play?

How many prime numbers are there from 1 to 999?

What are L1 and L2 regularisation, and when would you use each?

Which exchanges do you trade on?

Suppose you can forecast an external shock before it happens. How would you turn that forecast into an alpha?

What is an alpha? What is a net long-short alpha?

A stick is cut at two random points, giving three pieces. What is the probability that the three pieces can form a triangle?

In an array every element is at most k positions away from where it belongs in sorted order. What is the fastest way to sort it?

How many times in one day are the second hand and the minute hand of a clock perpendicular to each other?

Financial text often covers several companies at once. How would you find the main companies, extract the passages about each, and strip boilerplate?

What is the expected number of inversions in a uniformly random permutation of n elements?

Given an integer n, return how many integers less than n can be written in base 4 using only the digits 0 and 1.

Four hidden cards (60, -40, -20, 0), one in the opponent's pocket: walk away, take the pocket card, or pay $6 to peek at a table card. What is the optimal strategy?

You roll a die until the running sum exceeds 63. What is the distribution of the last running sum that was still at most 63?

Array A holds m sorted values followed by n empty slots, and array B holds n sorted values. Merge B into A in place so that A is sorted.

R red balls and B black balls are arranged in a random order in a row. What is the expected number of colour changes along the row?

The data set is too large to load into memory and you want to run a linear regression. What can you do?

Write down the complete-data log likelihood of a hidden Markov model.

Implement k-means in C++.

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