molecules.cpp: In function 'std::vector<int> find_subset(int, int, std::vector<int>)':
molecules.cpp:9:36: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
    9 |     if (mi * w[0] < l and w.size() >= mi) {
      |                           ~~~~~~~~~^~~~~
molecules.cpp:10:74: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   10 |         if (mi * w[0] + w[0] >= l and mi * w[0] + w[0] <= u and w.size() >= mi + 1) {
      |                                                                 ~~~~~~~~~^~~~~~~~~
molecules.cpp:17:61: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   17 |     else if (mi * w[0] >= l and mi * w[0] <= u and w.size() >= mi) {
      |                                                    ~~~~~~~~~^~~~~