/in/foo.cc:1:1: error: 'include' does not name a type
 include <bits/stdc++.h>
 ^~~~~~~
/in/foo.cc: In function 'int main()':
/in/foo.cc:7:12: error: 'cin' was not declared in this scope
     int n; cin >> n;
            ^~~
/in/foo.cc:21:27: error: 'puts' was not declared in this scope
     if ( flag ) puts("Yes");
                           ^
/in/foo.cc:22:19: error: 'puts' was not declared in this scope
     else puts("No");
                   ^