参考：

1 #include 
     
       2 #include 
      
        3 #include 
       
         4 #include 
        
          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 "<
         
          <<": This property will begin eroding in year "<
          <<'.'<