func_code_string: #include <bits/stdc++.h>   using namespace std;   bool comp(pair<unsigned long long, unsigned long long> a,             pair<unsigned long long, unsigned long long> b) {     unsigned long long s1, s2, h1, h2;     tie(s1, h1) = a;     tie(s2, h2) = b;     if (s1 * h2 > s2 * h1) return true;     return false;   }   int main() {     ios_base::sync_with_stdio(false);     cin.tie(0);     cout.tie(0);     int n;     cin >> n;     unsigned long long ans = 0;     string str;     vector<pair<unsigned long long, unsigned long long> > arr(n);     for (int i = 0; i < n; i++) {       cin >> str;       unsigned long long s1 = 0, h = 0;       for (auto x : str) {         if (x ==  s )           s1++;         else if (x ==  h )           h++, ans += s1;       }       arr[i] = make_pair(s1, h);     }     sort((arr).begin(), (arr).end(), comp);     unsigned long long s1 = 0;     for (auto i : arr) {       ans += s1 * 1LL * (i.second);       s1 += i.first;     }     cout << ans <<   n ;     return 0;   }   