hdu 1065 I Think I Need a Houseboat

参考：https://blog.csdn.net/neoxuhaotian/article/details/6112147

https://blog.csdn.net/lionel_d/article/details/44198125

#include <iostream>
#include <cstdio>
#include <cstring>
#include <cmath>
#define pi 3.1415926
using namespace std;
int main()
{
    int t;
    while (cin>>t)
    {
        for (int j=1;j<=t;j++)
        {
            float d,x,y;
            cin>>x>>y;
            d=sqrt(x*x+y*y);
            for (int i=1;;i++)
            {
                float s=i*100.0;
                float r=sqrt(s/pi);
                if (d<=r)
                {
                    cout<<"Property "<<j<<": This property will begin eroding in year "<<i<<'.'<<endl;
                    break;
                }
            }
        }
        cout<<"END OF OUTPUT."<<endl;//注意此句位置，不要误放入j循环内！
    }

    return 0;
}