foo.cc: In function 'std::vector<int> mergeSortedVectors(std::vector<int>&, std::vector<int>&)':
foo.cc:11:14: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   11 |     while (i < va.size() && j < vb.size()) {
      |            ~~^~~~~~~~~~~
foo.cc:11:31: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   11 |     while (i < va.size() && j < vb.size()) {
      |                             ~~^~~~~~~~~~~
foo.cc:22:14: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   22 |     while (i < va.size()) {
      |            ~~^~~~~~~~~~~
foo.cc:27:14: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   27 |     while (j < vb.size()) {
      |            ~~^~~~~~~~~~~
foo.cc: In function 'int main()':
foo.cc:51:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   51 |     for (int i = 0; i < vc.size(); i++) {
      |                     ~~^~~~~~~~~~~
foo.cc:52:29: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   52 |         cout << vc[i] << (i < vc.size() - 1 ? " " : "\n");
      |                           ~~^~~~~~~~~~~~~~~

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