ZJU1049--I Think I Need a Houseboat

#include <iostream>

#include <cstdio>
#include <cmath>

using namespace std;

int main()
{
    int n,i,z=0;
    float x,y,r,area;

    cin>>n;
    for(i=1;i<=n;i++){
        cin>>x>>y;

        r=sqrt(x*x+y*y);
        area=3.1415*r*r/2;                      //注意是半圆的面积
        z=(int)ceil(area/50.0);

        printf("Property %d: This property will begin eroding in year %d.\n",i,z);

        x=0;y=0;r=0;z=0;
    }

    cout<<"END OF OUTPUT."<<endl;

    return 0;
}