func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     int n;     char name[21];     int initials[26];     cin >> n;     memset(initials, 0, 26 * sizeof(int));     for (int i = 0; i < n; ++i) {       cin >> name;       initials[name[0] -  a ]++;     }     int total = 0;     for (int i = 0; i < 26; ++i) {       int k = initials[i];       if (k % 2)         total += ((k - 1) / 2) * ((k - 1) / 2);       else         total += k / 2 * (k / 2 - 1);     }     cout << total << endl;     return 0;   }   