Quantitative developer Interview Questions
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How to measure 9 minutes using only a 4 minute and 7 minute hourglass The key is understanding that you will have to use the two hourglasses together. Since this problem could be asked in many ways using different values for the hourglasses and the total amount of time, it's more important to understand how you use the tools rather than memorize a specific example. The question is used to determine those who can apply their knowledge to solve problems vs. those who memorize answers "from the book". Start both timers. After four minutes, the four-minute timer will have expired and the seven-minute timer will have three minutes remaining. Flip the four minute timer over. After seven minutes, the seven-minute timer will have expired and the four-minute timer will still have one minute left. Flip the seven-minute timer over. After eight minutes, the four-minute timer will have expired for the second time. The seven-minute timer will have accumulated one minute after it's last flip. Flip over the seven-minute timer and when it expires nine minutes will have elapsed. For extra measure, you can always throw in something like, "assuming the timers can be flipped over nearly instantly..." Show More Responses One or more comments have been removed. |
The first question he gave me was not hard. 1. You call to someone's house and asked if they have two children. The answer happens to be yes. Then you ask if one of their children is a boy. The answer happens to be yes again. What's the probability that the second child is a boy? 2. (Much harder) You call to someone's house and asked if they have two children. The answer happens to be yes. Then you ask if one of their children's name a William. The answer happens to be yes again.(We assume William is a boy's name, and that it's possible that both children are Williams) What's the probability that the second child is a boy? |
How many numbers between 1 and 1000 contain a 3? |
You have a chest of 8 drawers. With probability 1/2, you put a letter in one of the drawers. With probability 1/2, you don't put a letter in any drawer. I open the first 7 drawers, all are empty. What is the probability there is a letter in the 8th drawer? |
If you toss a coin n times, what's the expected value of n if you get the 2nd head? |
Given a m*n matrix with values -1 or 1, try to flip the values in a given row and a given line efficiently. |
What is the probability of an integer from 1 to 60,000 not having the digit 6? |
Given a char buffer[4096], write a malloc implementation. |
keep throw a coin if two head A will win if first is head second is tail B will win, keep throwing until have a winner. who has better chance to win? |
What is the complexity of a heap insert? |
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