杭電oj數學題-1

1065： 杭電1065

貼代碼：

#define pi 3.1415926
#include <cstdio>
#include <cstdlib>
using namespace std;

int main()
{
	int n, count=1, z;
	double x, y;
	scanf("%d", &n);
	while (count <= n)
	{
		scanf("%lf %lf", &x, &y);
		z = pi*(x*x + y*y) / 100 + 1;
		printf("Property %d: This property will begin eroding in year %d.\n", count++, z);
	}

	printf("END OF OUTPUT.\n");
	return 0;
}
           

1071 杭電1071

貼代碼：

#include <cstdio>
using namespace std;

int main()
{
	double x1, x2, x3, y1, y2, y3;
	double a, b, c, k, h, s;
	int n;
	scanf("%d", &n);
	while (n--)
	{
		scanf("%lf %lf", &x1, &y1);
		scanf("%lf %lf", &x2, &y2);
		scanf("%lf %lf", &x3, &y3);

		a = (y2 - y1) / ((x2 - x1)*(x2 - x1));
		b = -2 * a*x1;
		c = y1 - a*x1*x1 - b*x1;

		k = (y2 - y3) / (x2 - x3);
		h = y2 - k*x2;

		s = a / 3 * (x3*x3*x3 - x2*x2*x2) + (b - k) / 2 * (x3*x3 - x2*x2) + (c - h)*(x3 - x2);

		printf("%.2lf\n", s);
	}

	return 0;
}