1026. Program running time

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#include <iostream>
using namespace std;

intmain()
{
	int c1, c2;
	cin >> c1 >> c2;
	int m = (c2 - c1) / 100;
	if(m % 100 >= 50) {
		m++;
	}
	int hour = m / 3600;
	int minute = m % 3600 / 60;
	int second = m % 60;
	
	printf("%02d:%02d:%02d", hour, minute, second);
	return 0;
}