Uva 138(Street Numbers)

http://tafhimui.wordpress.com/2011/07/03/uva-138-street-numbers/?blogsub=confirming#subscribe-blog


#include <cstdio>
#include <iostream>
#include <cmath>
#include <climits>
using namespace std;

//int output[20][2]={0,0};

int main()
{

    //freopen("out.txt","w+",stdout);
    double rupper, rlower;
    long long i, count, upper, lower;

    for (i=2, count=1 ; i<=INT_MAX && count<=10 ; i++)
    {
        upper = 2 * i * i;
        lower = sqrt(upper);

        if ((upper - (lower*lower) - lower)==0)
        {
            printf("%10lld%10lld\n",i,lower);
            count++;
        }
    }

    return 0;

}