HDU - 1030 Delta-wave

#include <iostream>
#include <cstdio>
#include <cmath>
#include <cstdlib>
#include <algorithm>
using namespace std;
int main()
{
    int n, m;
    while (cin >> n >> m)
    {

        int Za = (int)ceil(sqrt(n * 1.0));
        int Zb = (int)ceil(sqrt(m * 1.0));
        int Xa = (Za * Za - n) / 2 + 1;
        int Xb = (Zb * Zb - m) / 2 + 1;
        int Ya = (n - (Za - 1) * (Za - 1) - 1) / 2 + 1;
        int Yb = (m - (Zb - 1) * (Zb - 1) - 1) / 2 + 1;

        int ans = abs(Za - Zb) + abs(Xa - Xb)  + abs(Ya - Yb);
        printf("%d\n", ans );
    }
}