foo.cc: In function 'void DifferenceSet(std::vector<int>, std::vector<int>, std::vector<int>*)':
foo.cc:13:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   13 |         for (i = 0; i < vtSet_A.size(); i++)
      |                     ~~^~~~~~~~~~~~~~~~
foo.cc:16:31: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   16 |                 for (j = 0; j < vtSet_B.size(); j++)
      |                             ~~^~~~~~~~~~~~~~~~
foo.cc:21:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   21 |                 if (j == vtSet_B.size())
      |                     ~~^~~~~~~~~~~~~~~~~
foo.cc: In function 'void MergeSet(std::vector<int>&, std::vector<int>&, std::vector<int>&)':
foo.cc:32:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   32 |         for (i = 0; i < vtSet_A.size(); i++)
      |                     ~~^~~~~~~~~~~~~~~~
foo.cc:37:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   37 |         for (i = 0; i < vtSet_B.size(); i++)
      |                     ~~^~~~~~~~~~~~~~~~
foo.cc:40:31: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   40 |                 for (j = 0; j < vtMergeSet.size(); j++)
      |                             ~~^~~~~~~~~~~~~~~~~~~
foo.cc:52:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   52 |                 if (j == vtMergeSet.size())
      |                     ~~^~~~~~~~~~~~~~~~~~~~
foo.cc: In function 'int main(int, char**)':
foo.cc:80:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   80 |         for (int i = 0; i < vtSet_C.size(); i++)
      |                         ~~^~~~~~~~~~~~~~~~

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