func_code_string: #include <bits/stdc++.h>   static const int MOD = 1000000007;   using ll = long long;   using u32 = unsigned;   using u64 = unsigned long long;   using namespace std;   template <class T>   constexpr T INF = ::numeric_limits<T>::max() / 32 * 15 + 208;   char buf[200001];   int main() {     int q;     cin >> q;     while (q--) {       int n;       cin >> n;       string s, t;       cin >> s >> t;       int a = 1, b = 0;       for (int i = 0; i < n; ++i) {         if (s[i] <=  2  && t[i] <=  2 ) {         } else if (s[i] <=  2 )           b = 0;         else if (t[i] <=  2 )           a = 0;         else {           swap(a, b);         }       }       puts(b ?  YES  :  NO );     }     return 0;   }   