2237.cpp

这是哈尔滨工业大学acmOJ的源代码

/*  This Code is Submitted by wywcgs for Problem 2237 on 2006-05-22 at 19:27:33 */ 
#include <cstdio>
#include <cstring>

int main()
{
	double t[5], d[4];
	int i;
	char time[16];
	
	while(true) {
		for(i = 0; i < 5; i++) {
			scanf("%s", time);
			if(!strcmp(time, "-1")) return 0;
			int h, m, s; sscanf(time, "%d:%d:%d", &h, &m, &s);
			t[i] = h*3600+m*60+s;
		}
		for(i = 0; i < 4; i++) d[i] = t[i+1] - t[0];
		double r = d[2]*d[3]/(d[3]+(d[3]-d[2])*d[3]*(d[1]-d[0])/d[0]/(d[3]-d[1]))+t[0];
		int cpm = (int)(r+0.5);
		printf("%02d:%02d:%02d\n", cpm/3600, cpm%3600/60, cpm%60);
	}
}