team name, C++ (gcc)

team name

//g++  7.4.0

#include <bits/stdc++.h>
using namespace std;
typedef long long int ll;

ll permutation(ll n, ll k) 
{ 
    ll fact[n + 1]; 
  
    // Base case 
    fact[0] = 1; 
  
    // Calculate value  
    // factorials up to n 
    for(ll i = 1; i <= n; i++) 
       fact[i] = i * fact[i - 1]; 
  
    // P(n,k) = n! / (n - k)! 
    return fact[n] / fact[n - k]; 
}

int main()
{
    int t;
    cin >> t;
    while(t--){
        int n;
        cin >> n;
        vector<string> v(n);
        for(int i=0;i<n;i++)
            cin >> v[i];
        unordered_set<string> st;
        int count = 0;
        for(int i=0;i<n;i++)
            st.insert(v[i]);
        for(int i=0;i<n;i++){
            string temp = v[i];
            for(int j=0;j<n;j++){
                string test = v[j];
                string key = temp[0] + test.substr(1, test.size()-1);
                if (st.find(key) == st.end()){
                    count++;
                    st.insert(key);
                }
                else
                    continue;
            }
        }
        cout << permutation(count, 2) << endl;
    }
}


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