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      Citadel Securities

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      Citadel Securities Trader interview

      Citadel Securities Interview Question

      Trader Interview

      Describe a program to determine whether or not an integer is prime.

      Interview Answers

      Anonymous

      Jun 7, 2025

      Say the integer is n, check whether n is divisible by any integer i where 2 conclude that n is prime.

      Anonymous

      Mar 5, 2019

      May I ask how many coding question you had? And is it through coderpad? Many thanks!

      1

      Anonymous

      Apr 18, 2019

      This is an easy question, man. At least you could provide a solution with the worst complexity of sqrt(n) and average sqrt(n / log(n) ). And next, they could move on to the case of bits shifting.

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