17网易-优雅的点

#include<iostream>
#include<algorithm>
#include<vector>
#include<math.h>
using namespace std;

int main() {
    int n, num = 0;
    cin >> n;
    if (n > 0) {
        double b = sqrtf(n), a = sqrtf(n / 2);
        for (int i = ceil(a); i <= int(b); i++)
        {
            if (i == 0) continue;
            double x = sqrtf(n - i*i);
            if (floor(x) == x) {
                if (x*x + i*i == n) {
                    if (x == 0 || x == i)
                        num += 4;
                    else
                        num += 8;
                }
            }
        }
        cout << num << endl;
    }
    else
        cout << 0 << endl;
    return 0;
}