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| #include <bits/stdc++.h>
#define ios ios::sync_with_stdio(0)
using namespace std;
signed main(){
int a1,b1,c1,a2,b2,c2;
scanf("%d:%d:%d",&a1,&b1,&c1);
scanf("%d:%d:%d",&a2,&b2,&c2);
int a = a1*3600+b1*60+c1,b = a2*3600+b2*60+c2;
if(b-a>=0){
int temp = b-a;
printf("%02d:%02d:%02d",temp/3600,(temp%3600)/60,temp%60);
}
else{
int temp = 86400+b-a;
printf("%02d:%02d:%02d",temp/3600,(temp%3600)/60,temp%60);
}
}
|