> #include<iostream>
> #include<math.h>
> #define PI 3.1415926
> using namespace std;
> struct point
> {
> 	float x;
> 	float y;float z;int w;
> };
> void paixu(point *a,int n)
> {for(int i=0;i<n-1;i++)
>  for(int j=i+1;j<n;j++)
> 	 if(a[i].z>a[j].z)
> 	 { 
> 		 point c;c=a[i];a[i]=a[j];a[j]=c;
> 	 int k;k=a[i].w;a[i].w=a[j].w;a[j].w=k;
> 	 }
> }
> 
> 
> void zezhang(float &r)
> {float w=r*r*PI+100;
> w=w/PI;
> 	r=pow(w,0.5);
> }
> 
> int main()
> {point a[10];
> int n;
> cin>>n;
> for(int i=0;i<n;i++)
> {
> cin>>a[i].x;
> cin>>a[i].y;
> a[i].z=pow(a[i].x*a[i].x+a[i].y*a[i].y,0.5);a[i].w=i+1;
> }
> paixu(a,n);
> for(i=0;i<n;i++)
> {int count=0;float r=0;
> while(1)
> {zezhang(r);
> count++;
> if(a[i].z<r){cout<<"Property "<<a[i].w<<": This property will begin eroding in year "<<count<<'.'<<endl;break;}
> 
> }
> }
> cout<<"END OF OUTPUT."<<endl;
> return 0;
> }