foo.cc: In function 'void SeqList(std::vector<int>&, std::vector<int>&)':
foo.cc:8:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i=0;i<a.size();i++)
              ~^~~~~~~~~
foo.cc:10:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(int j=0;j<b.size();j++)
               ~^~~~~~~~~
foo.cc: In function 'int main()':
foo.cc:34:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i=0;i<c.size();i++)
              ~^~~~~~~~~

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