foo.cc: In function ‘bool cmp(Node, Node)’:
foo.cc:10:41: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses]
   10 |         return x.num<y.num||x.num==y.num&&x.id<y.id;
      |                             ~~~~~~~~~~~~^~~~~~~~~~~
foo.cc: In function ‘int main()’:
foo.cc:35:14: error: ‘sync_with_stadio’ is not a member of ‘std::ios’ {aka ‘std::basic_ios<char>’}
   35 |         ios::sync_with_stadio(false);
      |              ^~~~~~~~~~~~~~~~