Heron

#include <iostream>#include <iomanip>using namespace std;int main(int argv, char**argc){    int n;    while (true)    {        n = -1;        cin >> n;        if(n <= 0)            break;        n /= 2;        int max = 1;        for(int i=0;i<n;i++) max *= 10;        for (int a=0;a<max;a++)        {            for (int b=0;b<max;b++)            {                if ((a+b)*(a+b) == (a*max + b))                {                    cout << setw(n) << setfill('0') << a;                    cout << setw(n) << setfill('0') << b;                    cout << endl;                }            }        }    }    return 0;}