PermMissingElem

Find the missing element in a given permutation.

Here my solution in C++

int solution(vector<int> &A) {     long long sum = 0;     for ( const auto &item : A)         sum += item;     long long sum_tot = ((A.size() + 1) * (A.size() + 2)) /2;     return int (sum_tot-sum); }
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