A10 Networks Interview Question
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Interview Question for Support Engineer at A10 Networks:
Nov 17, 2011
If you have three people standing, all facing the same direction, each person can see the color of the hat of only the person directly in front of them (which can be either black or white). There are two hats of each color (four total). The hats are placed on the persons' heads one at a time, starting with the one in the very front. When someone knows for certain what color hat they have, they need to declare that they have discovered the color of their hat. In this scenario, no matter which hats are distributed, at least one person can be certain of their hat color. What are these scenarios, and what are the probability distributions for each?
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Answers & Comments (3)
Dec 21, 2011
samar's answer would be correct if the problem allowed each person to see hats being worn by *ALL* people in front of them. However, the original question posted said "each person can see the color of the hat of *ONLY* the person *DIRECTLY* in front of them."
I think the original question was incorrectly worded. As it is stated, I don't think anyone can know the color of their hat, since nobody has more than one piece of information to start with.
I think the original question was incorrectly worded. As it is stated, I don't think anyone can know the color of their hat, since nobody has more than one piece of information to start with.
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Jan 11, 2012
There is also the problem of assuming the hat are placed on the head of each in alternate colors otherwise, the last person would see 2 of the same color in front of him thus giving him the solution to his color, providing the person sees both person in front of him as well
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by samar pratap singh:
the reason is,since the last person is not answering the colour of his hat,it means he can see two different colours of hats in front of him.so the person standing between them has to conclude that the colour of his hat would be just opposite of the person's hat,standing in front of him.