func_code_string: #include <bits/stdc++.h>   using namespace std;   ofstream fo( test.out );   ifstream fi( test.inp );   const long long MOD = 1e9 + 7;   const long long base = 269;   const int N = 1e5 + 5;   long long n, m, q, K, pos, t, rs, r;   long long cnt10, cnt11;   string s, a, b;   int main() {     ios_base::sync_with_stdio(false);     cin.tie(NULL);     cout.tie(NULL);     cin >> n;     cin >> a >> b;     for (long long(i) = 0; (i) < (n); (i)++) {       if (a[i] ==  1  && b[i] ==  0 ) cnt10++;       if (a[i] ==  1  && b[i] ==  1 ) cnt11++;     }     for (long long(i) = 0; (i) < (n); (i)++) {       if (a[i] ==  0  && b[i] ==  0 ) {         rs += cnt11;         rs += cnt10;       }       if (a[i] ==  0  && b[i] ==  1 ) rs += cnt10;     }     cout << rs;   }   