foo.cc: In member function 'SortedSeqList& SortedSeqList::Intersection(SortedSeqList&)':
foo.cc:110:10: warning: reference to local variable 'k' returned [-Wreturn-local-addr]
  110 |   return k;
      |          ^
foo.cc:99:17: note: declared here
   99 |   SortedSeqList k(n);
      |                 ^
foo.cc: In member function 'void SortedSeqList::AddMuch(int*, int)':
foo.cc:116:7: warning: unused variable 'z' [-Wunused-variable]
  116 |   int z;
      |       ^

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