full_permutation.cpp

#include <iostream>
#include <vector>
#include <algorithm>

int main()
{
    std::vector<int> a{1, 2, 3, 4, 5, 6};

    do {
        std::cout << a[0] << a[1] << a[2] << a[3] << a[4] << a[5] << std::endl;
    } while (std::next_permutation(a.begin(), a.end()));
}