1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
#include <iostream>
#include <vector>

using namespace std;

int main()
{
    int n;
    cin >> n;

    vector<int> add(n * n);

    for (int a = 1; a < n; ++a)
    {
        for (int b = a; b < n; ++b)
        {
            int ab = a * a + b * b;

            if (ab >= n * n)
                break;

            ++add[ab];
        }
    }

    int res = 0;

    for (int d = 1; d <= n; ++d)
    {
        for (int h = 1; h < d; ++h)
        {
            int dh = d * d - h * h;

            res += add[dh];
        }
    }

    cout << res << endl;

    return 0;
}