/in/foo.cc: In function 'void add(std::vector<int>)':
/in/foo.cc:38:18: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   38 |     if (p.size() >= lim)
      |         ~~~~~~~~~^~~~~~
/in/foo.cc: In function 'void bfs()':
/in/foo.cc:135:24: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
  135 |         if (h.k.size() > lim)
      |             ~~~~~~~~~~~^~~~~