foo.cc: In function 'node* set_inter(node*, node*)':
foo.cc:27:13: warning: variable 'tem' set but not used [-Wunused-but-set-variable]
   27 |         int tem[10000]={0};
      |             ^~~
foo.cc: In function 'node* input(int)':
foo.cc:73:16: warning: 'list' may be used uninitialized [-Wmaybe-uninitialized]
   73 |         return list;
      |                ^~~~
foo.cc:57:22: note: 'list' was declared here
   57 |         struct node *list;
      |                      ^~~~

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