Witch game

input/code.cpp: In function 'int main()':
input/code.cpp:43:12: warning: unused variable 'c' [-Wunused-variable]
     ll a,b,c,d,e;
            ^
input/code.cpp:43:14: warning: unused variable 'd' [-Wunused-variable]
     ll a,b,c,d,e;
              ^
input/code.cpp:43:16: warning: unused variable 'e' [-Wunused-variable]
     ll a,b,c,d,e;
                ^

#include <bits/stdc++.h>
using namespace std;
 
#define rep(i, a, b) for(int i = a; i < (b); ++i)
#define per(i, b, a) for(int i = b - 1; i >= a; i--)
#define trav(a, x) for(auto& a : x)
#define all(x) x.begin(), x.end()
#define sz(x) (int)(x).size()
typedef long long ll;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
typedef vector<int> vi;
typedef vector<ll> vl;
typedef long double ld;
typedef unsigned long long ull;
 
unsigned seed = chrono::system_clock::now().time_since_epoch().count();
mt19937 eng(seed);
 
ll random2(){
    return (1ll << 31ll)*eng()+eng();
}
 
ll n,m,k,q,T;
 
const ll big = 1000000007;
const ll big2 = 1000000009;
const ll mod =  998244353;
 
const int MAXN = 200001;
 
ll DEG[MAXN] = {0};
 
set<ll> S;
 
int main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0);
 
   // freopen("fhc.txt","r",stdin);
   // freopen("autput.txt","w",stdout);
 
    ll a,b,c,d,e;
 
    cin >> n;
    rep(c1,0,n){
        cin >> a;
        a--;
        b = c1;
        if(a > b)swap(a, b);
        ll h = a*n+b;
        if(S.find(h) == S.end()){
            S.insert(h);
            DEG[a]++;
            DEG[b]++;
        }
    }
    ll ans = (n * (n-1) * (n-2)) / 6 - sz(S) * (n-2);
    rep(c1,0,n){
        ans += (DEG[c1] * (DEG[c1]-1)) / 2;
    }
    cout << ans << "\n";
 
    return 0;
}

Test 1

Group: 1

Verdict: ACCEPTED

Test 2

Group: 1

Verdict: ACCEPTED

Test 3

Group: 1

Verdict: ACCEPTED

Test 4

Group: 1

Verdict: WRONG ANSWER

Test 5

Group: 1

Verdict: WRONG ANSWER

Test 6

Group: 2

Verdict: ACCEPTED

Test 7

Group: 2

Verdict: ACCEPTED

Test 8

Group: 2

Verdict: ACCEPTED

Test 9

Group: 2

Verdict: WRONG ANSWER

Test 10

Group: 2

Verdict: ACCEPTED

Test 11

Group: 3

Verdict: ACCEPTED

Test 12

Group: 3

Verdict: ACCEPTED

Test 13

Group: 3

Verdict: ACCEPTED

Test 14

Group: 3

Verdict: WRONG ANSWER

Test 15

Group: 3

Verdict: WRONG ANSWER