foo.cc: In function 'int main()':
foo.cc:33:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   33 |     for(i = 0, j = 0;i<v1.size()&&j<v2.size();)
      |                      ~^~~~~~~~~~
foo.cc:33:36: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   33 |     for(i = 0, j = 0;i<v1.size()&&j<v2.size();)
      |                                   ~^~~~~~~~~~
foo.cc:39:12: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   39 |     while(i<v1.size())
      |           ~^~~~~~~~~~
foo.cc:44:12: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   44 |     while(j<v2.size())
      |           ~^~~~~~~~~~
foo.cc:49:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   49 |     for(int i = 0; i<v3.size(); i++)
      |                    ~^~~~~~~~~~

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