#pragma once

#define EXERCISM_RUN_ALL_TESTS


namespace squares {

namespace detail {

constexpr unsigned sum(unsigned n)
{
    return (n*(n+1))/2;
}

}


constexpr unsigned square_of_sums(unsigned n)
{
    using detail::sum;
    return sum(n)*sum(n);
}

constexpr unsigned sum_of_squares(unsigned n)
{
    return (n*(n+1)*(2*n+1))/6;
}

constexpr unsigned difference(unsigned n)
{
    return square_of_sums(n) - sum_of_squares(n);
}

}