/in/foo.cc: In function 'void generateCombinations(const std::vector<int>&, int, int, int, std::vector<int>&, std::vector<int>&)':
/in/foo.cc:10:24: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   10 |     if (current.size() == k) {
      |         ~~~~~~~~~~~~~~~^~~~