foo.cc: In function 'void change(std::vector<int>)':
foo.cc:355:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  355 |     for (int i = 0;i < p.size();i++) {
      |                    ~~^~~~~~~~~~
foo.cc:356:28: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  356 |         for (int j = i+1;j < p.size();j++) {
      |                          ~~^~~~~~~~~~
foo.cc: In function 'void add(std::vector<int>)':
foo.cc:365:17: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
  365 |     if (p.size()>=lim) return;
      |         ~~~~~~~~^~~~~
foo.cc:366:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  366 |     for (int i = 0;i < p.size();i++) {
      |                    ~~^~~~~~~~~~
foo.cc: In function 'void delt(std::vector<int>)':
foo.cc:407:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  407 |     for (int i = 0;i < p.size();i++) {
      |                    ~~^~~~~~~~~~
foo.cc:416:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  416 |         } else if (i==p.size()-1) {
      |                    ~^~~~~~~~~~~~
foo.cc: In function 'void bfs()':
foo.cc:437:23: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
  437 |         if (h.k.size()>lim) continue;
      |             ~~~~~~~~~~^~~~
foo.cc: In function 'int main()':
foo.cc:447:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  447 |     scanf("%d",&n);
      |     ~~~~~^~~~~~~~~

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