Question: An array A contains n1 unique integers in the range [0,n1], 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)-time algorithm for finding that number. You are only allowed to use O(1) additional space besides the array A itself.

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