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Tower Research Capital LLC Software Engineer Interview Question (student candidate)

I interviewed in New York, NY and was asked:
"There are 10 red, 11 blue, 12 green chameleons. Sometimes, two chameleons meet. If they are the same color, nothing happens. If they are different colors, they will both change to the third color. Can all chameleons ever be the same color?"
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Part of a Software Engineer Interview Review - one of 30 Tower Research Capital LLC Interview Reviews

Answers & Comments

5
of 7
votes
No. Set of amounts mod 3 is always {0, 1, 2}
- Interview Candidate on Nov 3, 2011 Flag Response
0
of 0
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I'm stating a particular case where this is possible
let us assume if 9 green combines with 9 red to form 9 more blues..
then now 3 green and 1 red are left.
if 1 green combines with 1 more blue then 1 red will be generated and now the number of red and green are equal which is 2
So just combine these 2 and get all blues
- Tanuj on Sep 11, 2013 Flag Response
0
of 0
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I think you misunderstood Tanuj. 9 Green will combine with 9 Red to form 18 Blues. And 1 Green will combine with 1 Blue to make 2 Reds (not 1).
- Billy on Sep 18, 2013 Flag Response

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