Development Engineer Interview Questions

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Given a balance and marbles where one marble weighs more than the other, how many times do you have to use the balance to find the heaviest marble for 7 marbles. Then, extend that answer to how many marbles can you weigh with 4 tries.
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Software Development Engineer II

Interviewed at Expedia Group

3.7
Nov 5, 2012

Given a balance and marbles where one marble weighs more than the other, how many times do you have to use the balance to find the heaviest marble for 7 marbles. Then, extend that answer to how many marbles can you weigh with 4 tries.

you have 100 doors in a row that are all initially closed. you make 100 passes by the doors starting with the first door every time. the first time through you visit every door and toggle the door (if the door is closed, you open it, if its open, you close it). the second time you only visit every 2nd door (door #2, #4, #6). the third time, every 3rd door (door #3, #6, #9), etc, until you only visit the 100th door.
Sep 7, 2010

you have 100 doors in a row that are all initially closed. you make 100 passes by the doors starting with the first door every time. the first time through you visit every door and toggle the door (if the door is closed, you open it, if its open, you close it). the second time you only visit every 2nd door (door #2, #4, #6). the third time, every 3rd door (door #3, #6, #9), etc, until you only visit the 100th door.

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