foo.cc: In function 'int main()':
foo.cc:363:11: warning: unused variable 'x' [-Wunused-variable]
  363 |  int n,nb,x;
      |           ^
foo.cc: In instantiation of 'PolyLinkNode<T>& LinkList<T>::operator+(LinkList<T>&) [with T = int]':
foo.cc:377:26:   required from here
foo.cc:270:28: warning: unused variable 'bnt' [-Wunused-variable]
  270 |   int t[100],t1[100],cnt=0,bnt=0,Ln=0;
      |                            ^~~
foo.cc: In instantiation of 'PolyLinkNode<T> LinkList<T>::Chong() [with T = int]':
foo.cc:385:32:   required from here
foo.cc:217:20: warning: variable 'pre' set but not used [-Wunused-but-set-variable]
  217 |   PolyLinkNode<T> *pre=NULL;
      |                    ^~~

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