func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     int n;     string s, t;     cin >> n >> s >> t;     vector<int> a(n + 1);     for (int i = 0; i < n; ++i)       a[i] = (s[n - i - 1] -  a ) + (t[n - i - 1] -  a );     for (int i = 0; i < n; ++i) {       if (a[i] >= 26) {         ++a[i + 1];         a[i] -= 26;       }     }     vector<int> b(n + 1);     b[0] = a[0] / 2;     for (int i = 1; i <= n; ++i) {       b[i] = a[i] / 2;       if (a[i] & 1) b[i - 1] += 13;     }     for (int i = n - 1; i >= 0; --i) cout << char( a  + b[i]);   }   