> #include<iostream>
> 
> using namespace std;
> 
> void main()
> {
>  int a;
>  cin>>a;
>  cout<<endl;
>  for(int i=1;i<=a;i++)
>  {
> 	 float x,y;
> 	 cin>>x>>y;
>      int year=int(3.1415926*(x*x+y*y)/100)+1;
> 	 cout<<"Property "<<i<<": This property will begin eroding in year "<<year<<".\n";
>  }
>  cout<<"END OF OUTPUT."<<endl;
> }
> 
> 我实在看不出来，新手……