foo.cc: In function 'void dfs(xx)':
foo.cc:15:21: warning: comparison of integer expressions of different signedness: 'll' {aka 'int'} and 'std::vector<xx>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   15 |         for(ll i=0;i<d.v.size();i++)
      |                    ~^~~~~~~~~~~
foo.cc: In function 'int main()':
foo.cc:25:18: warning: comparison of integer expressions of different signedness: 'll' {aka 'int'} and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   25 |         for(i=0;i<s1.size();i++)
      |                 ~^~~~~~~~~~
foo.cc:29:32: warning: comparison of integer expressions of different signedness: 'll' {aka 'int'} and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   29 |                         while(i<s1.size()&&s1[i]!=' ')
      |                               ~^~~~~~~~~~
foo.cc:51:42: warning: comparison of integer expressions of different signedness: 'll' {aka 'int'} and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   51 |                                 for(j=0;j<s[i].size();j++)
      |                                         ~^~~~~~~~~~~~
foo.cc:79:42: warning: comparison of integer expressions of different signedness: 'll' {aka 'int'} and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   79 |                                 for(j=0;j<s[i].size();j++)
      |                                         ~^~~~~~~~~~~~
foo.cc:105:34: warning: comparison of integer expressions of different signedness: 'll' {aka 'int'} and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  105 |                         for(j=0;j<s[i].size();j++)
      |                                 ~^~~~~~~~~~~~

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