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 read()’:
foo.cc:17:29: warning: statement has no effect [-Wunused-value]
   17 |                 if(ch=='-')f==1;
      |                            ~^~~
foo.cc: In function ‘int main()’:
foo.cc:33:26: error: expected primary-expression before ‘.’ token
   33 |         cin.tie(0);cout<<.tie(0);
      |                          ^