#include <iostream>
#include <algorithm>
#include <vector>
 
double f(const std::vector<double> &arr, bool maxElem) {
    using iterator = decltype(arr.begin());
    auto me = maxElem ? &std::max_element<iterator> : &std::min_element<iterator>;
    return *me(arr.begin(), arr.end());
}
 
int main() {
    std::vector<double> v{1, 2, 0, 3, 1, 4, 42, 1, 2};
    std::cout << f(v, true) << std::endl;
    std::cout << f(v, false) << std::endl;
    return 0;
}

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