第一个点AC了，其他全WA……QWQ

#include <iostream>
using namespace std;
int shi,fen,miao;
int a,b;
int shijian;
int shi1,fen1,miao1;
int sudu;
int n;
int main(){
    scanf("%d:%d:%d",&shi,&fen,&miao);
    scanf("%d:%d:%d",&shi1,&fen1,&miao1);
    scanf("%d",&sudu);
    a=shi*60+fen*60+miao;
    b=shi1*60+fen1*60+miao1;
    shijian=b-a;
    cout<<shijian*sudu;
    return 0;
}

dalao求调