foo.cc: In function 'int main()':
foo.cc:25:12: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   25 |     while(i<va.size()&&j<vb.size()){
      |           ~^~~~~~~~~~
foo.cc:25:25: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   25 |     while(i<va.size()&&j<vb.size()){
      |                        ~^~~~~~~~~~
foo.cc:35:12: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   35 |     while(i<va.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(j<vb.size()){
      |           ~^~~~~~~~~~
foo.cc:43:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   43 |     for(int i=0;i<vc.size();i++){
      |                 ~^~~~~~~~~~

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