func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     ios_base::sync_with_stdio(0);     cin.tie(0);     cout.tie(0);     long long n;     string s1, s2;     cin >> n >> s1 >> s2;     long long count = 0;     for (long long i = 0; i < n / 2; i++) {       char a[4] = {s1[i], s1[n - i - 1], s2[i], s2[n - i - 1]};       if ((a[0] == a[1] and a[2] == a[3]) || (a[0] == a[3] and a[1] == a[2]) ||           (a[0] == a[2] and a[1] == a[3]))         count += 0;       else if ((a[0] == a[2] and a[1] != a[3]) ||                (a[0] == a[3] and a[1] != a[2]) ||                (a[0] != a[2] and a[1] == a[3]) ||                (a[0] != a[3] and a[1] == a[2]) || (a[0] != a[1] and a[2] == a[3]))         count += 1;       else         count += 2;     }     if (n % 2 == 1) count += (s1[n / 2] != s2[n / 2]);     cout << count;     return 0;   }   