原题戳这里

#include <cstdio>
using namespace std;
int n, m;
int gys (int, int);
int main()
{
	scanf ("%d%d", &n, &m);
	gys (n, m);
	return 0;
}
int gys (int n, int m)
{
	int r = n % m;
	if (r == 0) printf ("%d", m);
	else
	{
		n = m; m = r;
		gys (n, m);
	}
}

各位大佬帮忙看一看吧