In constructor ‘LinkList::LinkList(int)’,
    inlined from ‘int main()’ at foo.cc:58:17:
foo.cc:28:20: warning: ‘p’ may be used uninitialized [-Wmaybe-uninitialized]
   28 |             p->next=np;
      |             ~~~~~~~^~~
foo.cc: In function ‘int main()’:
foo.cc:15:15: note: ‘p’ was declared here
   15 |         Node* p;
      |               ^

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