Programador De Java Interview Questions

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There are 20 floors in a building. If you're on an elevator and you're trying to get to the 20th floor, what is the probability that 4 people ahead of you click the 20th floor before you do? Assuming you click last.
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Financial Software Developer Intern

Interviewed at Bloomberg

4
Apr 17, 2012

There are 20 floors in a building. If you're on an elevator and you're trying to get to the 20th floor, what is the probability that 4 people ahead of you click the 20th floor before you do? Assuming you click last.

This was not unexpected but a bit difficult. How would you represent the ordering of a deck of card if you only have 32bytes to work with. So, he explained that you have 52 objects, there are 52! possible ordering of them. how to encode one of those ordering within 32 bytes?
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Software Development Engineer

Interviewed at Amazon

3.5
Oct 2, 2011

This was not unexpected but a bit difficult. How would you represent the ordering of a deck of card if you only have 32bytes to work with. So, he explained that you have 52 objects, there are 52! possible ordering of them. how to encode one of those ordering within 32 bytes?

How many race heats are needed to find the 3 fastest pinewood derby cars out of a field of 8, if only 4 cars can run at a time (assuming that every car will always run the way/speed and each lane is exactly equivalent)?
Jun 13, 2012

How many race heats are needed to find the 3 fastest pinewood derby cars out of a field of 8, if only 4 cars can run at a time (assuming that every car will always run the way/speed and each lane is exactly equivalent)?

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