foo.cc: In function 'Node* SetInter(Node*, Node*)':
foo.cc:200:1: warning: no return statement in function returning non-void [-Wreturn-type]
  200 | }
      | ^
foo.cc: In function 'void remove(Node*, int, Node**)':
foo.cc:137:15: warning: 'tmp2' may be used uninitialized [-Wmaybe-uninitialized]
  137 |     tmp2->next=tmp->next;
      |     ~~~~~~~~~~^~~~~~~~~~
foo.cc:120:10: note: 'tmp2' was declared here
  120 |     Node*tmp2;
      |          ^~~~

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