func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     long long int n, i, j = 0, c1 = 0, c0 = 0;     string a, b;     vector<long long int> v0, v1;     cin >> n;     cin >> a;     cin >> b;     for (i = 0; i < n; i++) {       if (b[i] ==  0 ) {         if (a[i] ==  1 )           v1.push_back(i);         else           v0.push_back(i);       }       if (a[i] ==  0 )         c0++;       else         c1++;     }     j = v0.size() * c1;     j += (v1.size() * c0);     j -= (v1.size() * v0.size());     cout << j << endl;     return 0;   }   