HDU 1065 PI = 3.1415926

PI设置为3.1415927 WA了一次！

#include <iostream>
#include <cmath>
using namespace std;
const double PI = 3.1415926;

int main()
{
	int t;
	cin >> t;
	for(int i = 1; i <= t; i++)
	{
		double x, y;
		cin >> x >> y;
		double d = x * x + y * y ;
		double s = 0.5 * PI * d;
		int year = ceil(s / 50.0);
		printf("Property %d: This property will begin eroding in year %d.\n", i, year);
		if(i == t)
			printf("END OF OUTPUT.\n");
	}
	return 0;
}