foo.cc: In function 'int main()':
foo.cc:46:15: warning: 'L' may be used uninitialized in this function [-Wmaybe-uninitialized]
   46 |    sum += (p->coef*k);
      |            ~~~^~~~
foo.cc:55:15: note: 'L' was declared here
   55 |  PolyLinkList L(n);
      |               ^

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