#include <iostream>
#include <algorithm>
#include <cmath>
#include <utility>
int main()
{
int arr[] = {1,2,3,4,5};
auto pr = std::minmax_element(arr, arr + sizeof arr / sizeof * arr);
std::cout << sqrt((pr.first - arr + 1) * (pr.second - arr + 1));
}
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