func_code_string: #include <bits/stdc++.h>   using namespace std;   int main(int argc, char *argv[]) {     int t;     cin >> t;     while (t--) {       int len;       cin >> len;       string s1, s2;       cin >> s1 >> s2;       int cnt1 = 0, cnt2 = 0;       if (s1[0] >  2 ) {         cnt1++;         if (s2[0] <=  2 ) {           puts( NO );           continue;         }         cnt2++;       }       bool flag = true;       for (int i = 1; i < s1.size(); ++i) {         if (cnt1 % 2) {           if (s2[i] >  2 ) {             cnt2++;             if (s1[i] <=  2 ) {               flag = false;               break;             }             cnt1++;           }         } else {           if (s1[i] >  2 ) {             cnt1++;             if (s2[i] <=  2 ) {               flag = false;               break;             }             cnt2++;           }         }       }       if (cnt2 % 2 == 0) flag = false;       if (flag) {         puts( YES );       } else {         puts( NO );       }     }   }   