pku2854.cpp

这是ACM 方面的资料 是PKU的 北京大学的出来的

#include <stdio.h>

int main()
{
	int hh, mm, ss, T;
	double ans, Va, Vc;
	double t[5];
	int i;
	while (EOF != scanf("%d", &hh) && hh != -1)
	{
		scanf(":%d:%d", &mm, &ss);
		t[0] = hh * 3600 + mm * 60 + ss;
		for (i = 1; i < 5; i++)
		{
			scanf("%d:%d:%d", &hh, &mm, &ss);
			t[i] = hh * 3600.0 + mm * 60.0 + ss;
			t[i] -= t[0];
		}
		Va = (t[4] - t[1]) * 1.0 / (t[2] - t[1]);
		Vc = t[2] * 1.0 / t[3] * Va;
		ans = (Va * t[2] - t[4]) * 1.0 / (Vc - 1);
		T = (int)(ans + 0.5 + t[0]);
		hh = T / 3600;
		mm = (T % 3600) / 60;
		ss = T % 60;
		printf("%02d:%02d:%02d\n", hh, mm, ss);
	}
	return 0;
}