func_code_string: #include <bits/stdc++.h>   using namespace std;   const int N = 2e5 + 50;   char s[N], t[N];   int n, a[N], b[N], c[N];   int main(void) {     scanf( %d , &n);     scanf( %s , s);     scanf( %s , t);     for (int i = 0; i < n; i++) {       a[i] = s[i] -  a ;       b[i] = t[i] -  a ;     }     for (int i = 0; i < n; i++) {       c[i] += (a[i] + b[i]) / 2;       if ((a[i] + b[i]) % 2) {         c[i + 1] += 13;       }     }     for (int i = n - 1; i >= 0; i--) {       c[i - 1] += c[i] / 26;       c[i] %= 26;     }     for (int i = 0; i < n; i++) {       printf( %c , (char)( a  + c[i]));     }     printf(  n );     return 0;   }   