/in/foo.cc: In function 'void Unique(std::vector<int>&)':
/in/foo.cc:12:14: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   12 |     while (i < arr.size() - 1) {
      |            ~~^~~~~~~~~~~~~~~~
/in/foo.cc: In function 'void PrintArray(const std::vector<int>&, int)':
/in/foo.cc:22:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   22 |     if (index == arr.size()) return;
      |         ~~~~~~^~~~~~~~~~~~~