Development Intern Interview Questions

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Given list of words, some of which are anagrams (words that has the same letters, but different ordering, eg. CAT and ACT), how do we pair the anagrams and identify words that do not have anagram pair in one pass (going through the list once)
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Software Development Intern

Interviewed at BlackRock

3.7
Mar 19, 2014

Given list of words, some of which are anagrams (words that has the same letters, but different ordering, eg. CAT and ACT), how do we pair the anagrams and identify words that do not have anagram pair in one pass (going through the list once)

Reversi / Othello Game Logic: You receive a board size n and a series of moves. You have to simulate the game mechanics of Othello/Reversi. This involves placing a piece, checking all 8 directions (vertical, horizontal, diagonal) for opponent pieces, and "flipping" them if they are sandwiched between your pieces. You had to return the final score of Black vs. White pieces.
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PhD Algorithm Development Intern

Interviewed at Hudson River Trading

4.2
Nov 11, 2025

Reversi / Othello Game Logic: You receive a board size n and a series of moves. You have to simulate the game mechanics of Othello/Reversi. This involves placing a piece, checking all 8 directions (vertical, horizontal, diagonal) for opponent pieces, and "flipping" them if they are sandwiched between your pieces. You had to return the final score of Black vs. White pieces.

The most unexpected question for me was about networking: Given two IP addresses and one subnet mask as input (All are string data type), write a function to determine whether the two IP addresses are in the same subnet.
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Software Development Engineer Intern

Interviewed at Amazon

3.5
Feb 22, 2014

The most unexpected question for me was about networking: Given two IP addresses and one subnet mask as input (All are string data type), write a function to determine whether the two IP addresses are in the same subnet.

Interview 2: Like the first interview this one started with basic cv questions and a simple coding question. Then moved onto a longer question that was basically weighted graph search but the edge weights were dynamic. Harder than the first interview but still not too difficult compared to other companies. I'd say about similar in difficulty to google but easier than palantir.
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Software Development Engineer Intern

Interviewed at Amazon

3.5
Mar 16, 2014

Interview 2: Like the first interview this one started with basic cv questions and a simple coding question. Then moved onto a longer question that was basically weighted graph search but the edge weights were dynamic. Harder than the first interview but still not too difficult compared to other companies. I'd say about similar in difficulty to google but easier than palantir.

Interview 1: Started with basic cv chit-chat and discussing projects. Was asked general information (complexity and high level implementation) about data structures you'd expect to find in standard libraries. Continued on to a super simple coding question that was something like reversing a string in place. Then had a longer coding question that was a variant on the subtree sum problem and could be made to run in O(n) time with some preprocessing. Overall not particularly difficult.
avatar

Software Development Engineer Intern

Interviewed at Amazon

3.5
Mar 16, 2014

Interview 1: Started with basic cv chit-chat and discussing projects. Was asked general information (complexity and high level implementation) about data structures you'd expect to find in standard libraries. Continued on to a super simple coding question that was something like reversing a string in place. Then had a longer coding question that was a variant on the subtree sum problem and could be made to run in O(n) time with some preprocessing. Overall not particularly difficult.

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