我先写：

#include<bits/stdc++.h>
using namespace std;
signed main()
{
	int a,b,c,d,e,f;
	cin >> a >> b >> c >> d;
	e=((60-b)+(c-a+1)+d)/60;
	f=((60-b)+(c-a+1)+d)%60;
	cout << e << " " << f << endl;
	return 0;
}

WA了？？？

我又写：

#include<bits/stdc++.h>
using namespace std;
signed main()
{
	int a,b,c,d,e,f;
	cin >> a >> b >> c >> d;
    if (b > d)
        e = c - 1 - a;
        f = d + 60 - b;
	    cout << e << f << endl;
    else
        e = c - a;
        f = d - b;
	    cout << e << f << endl;        
	return 0;
}

依然WA了？？？