POJ-1005

#include<iostream>
#include<cmath>
//#include<algorithm>
using namespace std;

#define PI 3.1415926

/*
return: years
*/
int recursionFunc(float rCurrent, float xYMin){
float r;

if(rCurrent==0){
r=sqrt(100.0/PI);
}else{
r=sqrt(100.0/PI+pow(rCurrent,2));
}

if(r>xYMin){
return 1;
}else{
return 1+recursionFunc(r, xYMin);
}
}

int main(int argc, char *argv[]){
int n;
float x,y;
float r;
cin>>n;
for(int i=0;i<n;i++){
cin>>x>>y;
r=sqrt(pow(x,2)+pow(y,2));

cout<<"Property "<<i+1<<": This property will begin eroding in year "<<recursionFunc(0,r)<<"."<<endl;
}

cout<<"END OF OUTPUT."<<endl;

return 0;
}