我这个代码为啥有问题啊c++小白谢谢

#include<iostream>
using namespace std;
int main()
{
    int a, b, c, d;
    cin >> a >> b >> c >> d;
    if(b-d>=0)
    {
        cout << a - c << " " << b - d;
    }
    if(b-d<=0)
    {
        cout << a - c - 1 << " " << b - d + 60;
    }
    return 0;
}