POJ 1005 解题报告

#include<iostream>
#include<string>
using namespace std;

int main()
{
    double x, y;
    int n;
    const double PI = 3.14159265;
    const string s1="Property ",s2 = ": This property will begin eroding in year ",s3="END OF OUTPUT.";
    cin >> n;
    for (int k = 1; k <= n; k++)
    {
        cin >> x >> y;
        double area = (x*x + y*y)/2*PI;
        int ans = int(area/50.0)+1;
        cout << s1 << k << s2 << ans << "." << endl;
    }
    cout << s3 << endl;
    return 0;
}