运行 ID: 41963

Main.cc: In instantiation of ‘constexpr _Tp gcd(_Tp, _Tp) [with _Tp = long long int]’:
Main.cc:46:32:   required from here
Main.cc:42:1: error: body of constexpr function ‘constexpr _Tp gcd(_Tp, _Tp) [with _Tp = long long int]’ not a return-statement
 }
 ^