foo.cc: In function ‘std::vector<int> SetInter(int*, int, int*, int)’:
foo.cc:17:14: warning: comparison of integer expressions of different signedness: ‘int’ and ‘std::vector<int>::size_type’ {aka ‘long unsigned int’} [-Wsign-compare]
   17 |     while (i < v1.size() && j < v2.size()) {
      |            ~~^~~~~~~~~~~
foo.cc:17:31: warning: comparison of integer expressions of different signedness: ‘int’ and ‘std::vector<int>::size_type’ {aka ‘long unsigned int’} [-Wsign-compare]
   17 |     while (i < v1.size() && j < v2.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 < inter1.size(); i++) {
      |                     ~~^~~~~~~~~~~~~~~
foo.cc:53:15: warning: comparison of integer expressions of different signedness: ‘int’ and ‘std::vector<int>::size_type’ {aka ‘long unsigned int’} [-Wsign-compare]
   53 |         if (i < inter1.size() - 1) cout << " ";
      |             ~~^~~~~~~~~~~~~~~~~~~
foo.cc:57:23: warning: comparison of integer expressions of different signedness: ‘int’ and ‘std::vector<int>::size_type’ {aka ‘long unsigned int’} [-Wsign-compare]
   57 |     for (int i = 0; i < inter2.size(); i++) {
      |                     ~~^~~~~~~~~~~~~~~
foo.cc:59:15: warning: comparison of integer expressions of different signedness: ‘int’ and ‘std::vector<int>::size_type’ {aka ‘long unsigned int’} [-Wsign-compare]
   59 |         if (i < inter2.size() - 1) cout << " ";
      |             ~~^~~~~~~~~~~~~~~~~~~