foo.cc: In function 'void Unique(node*, node*)':
foo.cc:32:11: warning: unused variable 'p' [-Wunused-variable]
   32 |     node *p,*newhead,*temp;
      |           ^
foo.cc:32:23: warning: variable 'temp' set but not used [-Wunused-but-set-variable]
   32 |     node *p,*newhead,*temp;
      |                       ^~~~

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