func_code_string: #include <bits/stdc++.h>      using namespace std;      using ll = long long;      void solve()   {       int n;       int q;       cin >> n >> q;          string s;       cin >> s;          vector<array<int, 26>> pref(n + 1);       pref[0].fill(0);       for (int i = 0; i < n; i++)       {           for (int c = 0; c < 26; c++)               pref[i + 1][c] = pref[i][c] + (c == s[i] -  a );       }          for (int z = 0; z < q; z++)       {           int l, r;           cin >> l >> r;              int add = 0;           for (int c = 0; c < 26; c++)               add += (pref[r][c] - pref[l - 1][c]) * (c + 1);              cout << add <<   n ;       }   }      int main()   {       ios_base::sync_with_stdio(false), cin.tie(NULL);          solve();          return 0;   }   