func_code_string: #include <bits/stdc++.h>   using namespace std;   int n, seq[100005];   char s[2][55];   string a[100005], b[100005], cur;   void solve() {     scanf( %d , &n);     for (int i = 0; i < n; i++) {       scanf( %s %s , s[0], s[1]);       a[i] = s[0];       b[i] = s[1];     }     for (int i = 0; i < n; i++) {       scanf( %d , &seq[i]);       seq[i]--;     }     if (a[seq[0]] < b[seq[0]])       cur = a[seq[0]];     else       cur = b[seq[0]];     for (int i = 1; i < n; i++) {       if (cur < a[seq[i]] && cur < b[seq[i]]) {         if (a[seq[i]] < b[seq[i]])           cur = a[seq[i]];         else           cur = b[seq[i]];       } else if (cur < a[seq[i]])         cur = a[seq[i]];       else if (cur < b[seq[i]])         cur = b[seq[i]];       else {         puts( NO );         return;       }     }     puts( YES );   }   int main(void) {     solve();     return 0;   }   