Thursday Code Puzzler: Efficient Duplicate Detection
Thursday is code puzzler day here at DZone. The idea is simple: solve the coding problem as efficiently as you can, in any language or framework that you find suitable.
Note: Even though there really is nothing stopping you from finding a solution to this on the internet, try to keep honest, and come up with your own answer. It's all about the participation!
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Efficient Duplicate Detection
Give an array of 1001 elements, which includes the numbers 1 to 1000 inclusive in random order, plus one duplicate number, write the most efficient algorithm to detect the duplicate number. Make sure you only access each item in the array a maximum of once.
Catch up on all our previous puzzlers here.