func_code_string: #include <bits/stdc++.h>   using namespace std;   void Solve() {     int n;     string a, b;     cin >> n >> a >> b;     a =  -  + a +  - ;     b =  -  + b +  - ;     int val = 0;     for (int i = 1; i <= n; i++) {       if (a[i] != b[i])         val += 2;       else if (a[i] ==  0 ) {         val++;         if (a[i - 1] ==  1  && b[i - 1] ==  1 )           val++;         else if (a[i + 1] ==  1  && b[i + 1] ==  1 ) {           val++;           a[i + 1] = b[i + 1] =  - ;         }       }     }     cout << val << endl;   }   int main() {     int t;     cin >> t;     while (t--) Solve();     return 0;   }   