2497804_wa.cpp

北大大牛代码 1240道题的原代码 超级权威

#include <iostream>
#include <math.h>
using namespace std;
double p[8][2];

int main()
{
	int i, j, k, cas = 1;
	double tot, min, tmp;
	int a, b, c, d, e, f, g, h;

	while(cin>>a>>b>>c>>d>>e>>f>>g>>h)
	{
		if(a||b||c||d||e||f||g||h)
		{
			min = 10000000;
			p[0][0] = a;p[0][1] = b;
			p[1][0] = (a+c)/2.0;p[1][1] = (b+d)/2.0;
			p[2][0] = c;p[2][1] = d;
			p[3][0] = (c+e)/2.0;p[3][1] = (d+f)/2.0;
			p[4][0] = e;p[4][1] = f;
			p[5][0] = (e+g)/2.0,0;p[5][1] = (f+h)/2.0;
			p[6][0] = g;p[6][1] = h;
			p[7][0] = (g+a)/2.0;p[7][1] = (h+b)/2.0;
			tot = 0;
			for(i = 0; i < 7; i+=2)
				tot += p[i][0]*p[(i+2)%8][1]-p[i][1]*p[(i+2)%8][0];
			tot /= 2.0;
			if(tot < 0)
				tot *= -1;
			for(i = 0; i < 8; i++)
			{
				for(j = i+1; j < 8; j++)
				{
					tmp = 0;
					for(k = i; k < j; k++)
						tmp += p[k][0]*p[k+1][1]-p[k][1]*p[k+1][0];
					tmp += p[j][0]*p[i][1]-p[j][1]*p[i][0];
					tmp /= 2;
					if(tmp==4.75)
					{
						printf("%d %d\n",i,j);
						return 1;
					}
					if(tmp<0)
						tmp *= -1;
					if(fabs(tot-tmp*2)<min)
						min = fabs(tot-tmp*2);
				}
			}
			printf("Case %d: %.3lf %.3lf\n",cas++,(tot-min)/2,(tot-min)/2+min);
		}
		else
			break;
	}
	return 1;
}