@studyppx\
```cpp
#include<stdio.h>
#include<stdlib.h>
#include<math.h>
int main()
{
int a,b,c,d;
int i,j,k;
scanf("%d%d%d%d",&a,&b,&c,&d);
i = ( c - a - 1 ) * 60 + ( 60 - b ) + d;
j = i/60;
k=i%60;
printf("%d %d",j,k);
return 0;
}
```
by OIratrace @ 2024-01-24 08:07:52
你的 $b$ 呢？
by OIratrace @ 2024-01-24 08:08:39