There are three boxes, one contains only apples, one contains only oranges, and one contains both apples and oranges. The boxes have been incorrectly labeled such that no label identifies the actual contents of the box it labels. Opening just one box, and without looking in the box, you take out one piece of fruit. By looking at the fruit, how can you immediately label all of the boxes correctly?
Give an array of Integer which contain duplicate number from 1-100, how to count how many distinct number you have?
how to find the closest 2 number in an array of unique positive number
You have five bottles with pills. One bottle has 9 gram pills, the others have 10 gram pills. You have a scale that can only be used once. How can you find out which bottle contains the 9 gram pills?
how to test a toaster?
read in a string and output it backwards
Interview questions: recursion, probability
The brain teaser: what is the last digit of 2007 power 2007
test life cycle in assurance
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