Witch game

#include<bits/stdc++.h>

#define F first
#define S second
#define ll long long
#define ull unsigned long long
#define pb push_back
using namespace std;
ll n, c, s, m;
int g[5001][5001], d[5001];
int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cin >> n;
    for (int i = 1; i <= n; i++){
        int x;
        cin >> x;
        g[i][x] = 1;
        g[x][i] = 1;
    }
    for (int i = 1; i <= n; i++){
        for (int j = 1; j <= n; j++){
        d[i] += g[i][j];
        m += g[i][j];
        }
    }
    m /= 2;
    for (int i = 1; i <= n; i++)
        for (int j = 1; j <= n; j++)
            if (g[i][j] == 1)
            for (int l = 1; l <= n; l++){
                int  s = g[i][j] + g[j][l] + g[i][l];
                if (s == 3) c++;
            }
    for (int i = 1; i <= n; i++) s += d[i] * d[i];
    s = s / 2 + m;
    s = n * m - s;
    cout << n * (n - 1) * (n - 2) / 6 - s - c / 6;
}

Test 1

Group: 1

Verdict: ACCEPTED

Test 2

Group: 1

Verdict: ACCEPTED

Test 3

Group: 1

Verdict: ACCEPTED

Test 4

Group: 1

Verdict: ACCEPTED

Test 5

Group: 1

Verdict: ACCEPTED

Test 6

Group: 2

Verdict: ACCEPTED

Test 7

Group: 2

Verdict: ACCEPTED

Test 8

Group: 2

Verdict: ACCEPTED

Test 9

Group: 2

Verdict: ACCEPTED

Test 10

Group: 2

Verdict: ACCEPTED

Test 11

Group: 3

Verdict: RUNTIME ERROR

Test 12

Group: 3

Verdict: RUNTIME ERROR

Test 13

Group: 3

Verdict: RUNTIME ERROR

Test 14

Group: 3

Verdict: RUNTIME ERROR

Test 15

Group: 3

Verdict: RUNTIME ERROR