/in/foo.cc: In function 'int main()':
/in/foo.cc:24:22: error: expected ';' before '}' token
  {scanf("%d",&arr[i])};
                      ^
/in/foo.cc: In function 'bool comp_node(Node, Node)':
/in/foo.cc:18:1: warning: control reaches end of non-void function [-Wreturn-type]
 }
 ^