Research Programmer Interview Questions

124 research programmer interview questions shared by candidates

Given a string s containing just the characters '(', ')', '{', '}', '[' and ']', determine if the input string is valid. An input string is valid if: 1. Open brackets must be closed by the same type of brackets. 2. Open brackets must be closed in the correct order. 3. Every close bracket has a corresponding open bracket of the same type.
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Research Programmer

Interviewed at Carnegie Mellon University

4.4
Jun 30, 2025

Given a string s containing just the characters '(', ')', '{', '}', '[' and ']', determine if the input string is valid. An input string is valid if: 1. Open brackets must be closed by the same type of brackets. 2. Open brackets must be closed in the correct order. 3. Every close bracket has a corresponding open bracket of the same type.

I asked him what did he think about my case analysis. Because I spent a lot of time preparing any potential questions he might ask before the interview. But he ended up asking nothing about that. He said it was pretty good. That's it.
Nov 30, 2015

I asked him what did he think about my case analysis. Because I spent a lot of time preparing any potential questions he might ask before the interview. But he ended up asking nothing about that. He said it was pretty good. That's it.

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