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There is a stream of incoming tweets, and you have a computer with only enough memory to hold one tweet. How do you return a random tweet, where each tweet has a 1/n chance of being returned? For example, if 5 tweets have come in, then there should be a 1/5 chance of returning any one of those 5 tweets.
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Android Software Engineer Intern

Interviewed at StubHub

2.4★
Nov 24, 2014

There is a stream of incoming tweets, and you have a computer with only enough memory to hold one tweet. How do you return a random tweet, where each tweet has a 1/n chance of being returned? For example, if 5 tweets have come in, then there should be a 1/5 chance of returning any one of those 5 tweets.

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