View Code of Problem 56

#include <stdio.h>
using namespace std;
int main(){
	int h1,m1,s1;
	int h2,m2,s2;
	scanf("%d:%d:%d", &h1,&m1,&s1);
	scanf("%d:%d:%d", &h2,&m2,&s2);
    long long int  sm1 = h1*3600+m1*60+s1;
	long long int  sm2 = h2*3600+m2*60+s2;
	if( sm1 > sm2 ){
		int temp = sm1;
		sm1 = sm2;
		sm2 = temp;
	}
	long long int sm3 = sm2 - sm1;
	int hour = sm3/3600;
	int minute = (sm3-hour*3600)/60;
	int second = sm3%60%60%60;
	printf("%02d:%02d:%02d", hour, minute,second);
	return 0;
	
}