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

 1 #include <iostream>
 2 #include <cstdio>
 3 #include <cstring>
 4 #include <cmath>
 5 #define pi 3.1415926
 6 using namespace std;
 7 int main()
 8 {
 9     int t;
10     while (cin>>t)
11     {
12         for (int j=1;j<=t;j++)
13         {
14             float d,x,y;
15             cin>>x>>y;
16             d=sqrt(x*x+y*y);
17             for (int i=1;;i++)
18             {
19                 float s=i*100.0;
20                 float r=sqrt(s/pi);
21                 if (d<=r)
22                 {
23                     cout<<"Property "<<j<<": This property will begin eroding in year "<<i<<'.'<<endl;
24                     break;
25                 }
26             }
27         }
28         cout<<"END OF OUTPUT."<<endl;//注意此句位置，不要误放入j循环内！
29     }
30 
31     return 0;
32 }