I Think I Need a Houseboat（1005）

#include <iostream>
#include <cmath>
#include <vector>
using namespace std;

void main()
{
    double area=50;
    double R=0;
    int line;
    cin>>line;
    int i;
    double x,y;
    vector<double> dist;
    vector<double>::iterator dit;
    vector<int> res;
    vector<int>::iterator rit;
    for (i=0;i<line;i++)
    {
        cin>>x>>y;
        dist.push_back(sqrt(x*x+y*y));
    }

    int year=0;
    for (dit=dist.begin();dit!=dist.end();dit++)
    {
        area=50;
        year=0;
        while (1)
        {
            R=sqrt(2*area/3.1415926);
            area+=50;
            year++;
            if (R>=*dit)
            {
                res.push_back(year);
                break;
            }
        }
    }

    for (i=1,rit=res.begin();rit!=res.end();rit++,i++)
    {    
        cout<<"Property"<<" "<<i<<": ";
        cout<<"This property will begin eroding in year ";
        cout<<*rit<<'.'<<endl;
    }
    cout<<"END OF OUTPUT."<<endl;

}