应该是这样吧！

#include<iostream>
using namespace std;
int main(){
    int a,b,c,d,e,f;
    cin>>a>>b>>c>>d;
    a=a*3600+b*60;
    c=c*3600+d*60;
    a=c-a;
    e=a/3600;
    f=(a-e*3600)/60;
    cout<<e<<" "<<f;
}