#include <type_traits>

int main()
{
    static_assert( std::is_same_v<most_common_t<int, float, double>::type, int> );
    static_assert( most_common<int, float, double>::value == 1 );
    
    static_assert( std::is_same_v<most_common_t<int, float, double, int>::type, int> );
    static_assert( most_common<int, float, double, int>::value == 2 );
    
    static_assert( std::is_same_v<most_common_t<float, int, double, int>::type, int> );
    static_assert( most_common<float, int, double, int>::value == 2 );
    
    static_assert( std::is_same_v<most_common_t<float, int, float, double, int>::type, float> );
    static_assert( most_common<float, int, float, double, int>::value == 2 );

    static_assert( std::is_same_v<most_common_t<int, float, int, double, int>::type, int> );
    static_assert( most_common<int, float, int, double, int>::value == 3 );
}