foo.cc: In function 'int main()':
foo.cc:55:2: error: 'PolyLinkList' was not declared in this scope; did you mean 'PolyList'?
   55 |  PolyLinkList p;
      |  ^~~~~~~~~~~~
      |  PolyList
foo.cc:59:3: error: 'p' was not declared in this scope
   59 |   p.Append(x,z);
      |   ^
foo.cc:63:8: error: 'p' was not declared in this scope
   63 |  cout<<p.calculate(k);
      |        ^

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