Intern Interview Questions

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There were 2 questions I tackled. The first was a power function that needed to be implemented in logn time and a Java encapsulation question (asking questions about making arrays inaccessible from outside the object).
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Software Engineer Intern

Interviewed at Wealthfront

4.2
Mar 25, 2014

There were 2 questions I tackled. The first was a power function that needed to be implemented in logn time and a Java encapsulation question (asking questions about making arrays inaccessible from outside the object).

Three coins are in a bag. The first coin flips heads with probability 50%, the second coin flips heads with probability 60%, and the third coin flips heads with probability 70%. I pull out a coin and flip heads. If I flip this coin again, what is the probability I will get heads?
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Intern

Interviewed at Jane Street

4.4
Mar 2, 2016

Three coins are in a bag. The first coin flips heads with probability 50%, the second coin flips heads with probability 60%, and the third coin flips heads with probability 70%. I pull out a coin and flip heads. If I flip this coin again, what is the probability I will get heads?

Given a string of Rs and Gs, design an algorithm to produce a string with Rs in the front and Gs after that. The number of flips from Rs to Gs or otherwise should be minimum. The number of Rs and Gs in the end need not be same as that in the beginning, however the length of the entire string should be the same.
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Software Development Engineer Intern

Interviewed at Amazon

3.5
May 26, 2012

Given a string of Rs and Gs, design an algorithm to produce a string with Rs in the front and Gs after that. The number of flips from Rs to Gs or otherwise should be minimum. The number of Rs and Gs in the end need not be same as that in the beginning, however the length of the entire string should be the same.

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