Finding missing numbers in an array

Posted by sandeep on Stack Overflow See other posts from Stack Overflow or by sandeep
Published on 2010-04-07T05:10:36Z Indexed on 2010/04/07 9:03 UTC
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Given an array of size n, which contains numbers in the range 1 to n, and in which each number is present at least once, but some numbers may be missing, how can I find the missing numbers?

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