Given an array of integers, how do you find the number that repeat n times.

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Published on 2010-03-23T03:57:16Z Indexed on 2010/03/23 4:01 UTC
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homework

Given an array of integers where some numbers repeat 1 time, some numbers repeat 2 times and only one number repeats 3 times, how do you find the number that repeat 3 times. Using hash was not allowed. Complexity of algorithm should be O(n)

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