/in/foo.cc: In function 'void change(std::vector<int>)':
/in/foo.cc:22:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   22 |     for (int i = 0;i < p.size();i++) {
      |                    ~~^~~~~~~~~~
/in/foo.cc:23:28: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   23 |         for (int j = i+1;j < p.size();j++) {
      |                          ~~^~~~~~~~~~
/in/foo.cc: In function 'void add(std::vector<int>)':
/in/foo.cc:32:17: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   32 |     if (p.size()>=lim) return;
      |         ~~~~~~~~^~~~~
/in/foo.cc:33:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   33 |     for (int i = 0;i < p.size();i++) {
      |                    ~~^~~~~~~~~~
/in/foo.cc: In function 'void delt(std::vector<int>)':
/in/foo.cc:74:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   74 |     for (int i = 0;i < p.size();i++) {
      |                    ~~^~~~~~~~~~
/in/foo.cc:83:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   83 |         } else if (i==p.size()-1) {
      |                    ~^~~~~~~~~~~~
/in/foo.cc: In function 'void bfs()':
/in/foo.cc:104:23: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
  104 |         if (h.k.size()>lim) continue;
      |             ~~~~~~~~~~^~~~