Question: An array A contains n-1 unique integers in the range [0,n-1], that is, there is one number from this range that is not in A.

An array A contains n-1 unique integers in the range [0,n-1], that is, there is one number from this range that is not in A. Design an O(n) algorithm for finding that number. Use only O(1) additional space besides the array A itself.

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