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There are 100 people standing near the beginning of a row of 100 closed doors. The first person goes down the row and opens every door. The second person closes every 2nd door. The third person changes the state of every 3rd door, and so on. Write a routine to find the state of door X after person Y passes by.
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Software Engineer

Interviewed at Capital One

3.6
Nov 12, 2015

There are 100 people standing near the beginning of a row of 100 closed doors. The first person goes down the row and opens every door. The second person closes every 2nd door. The third person changes the state of every 3rd door, and so on. Write a routine to find the state of door X after person Y passes by.

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