foo.cc: In function ‘int dfs(std::unordered_map<std::__cxx11::basic_string<char>, int>&, std::vector<std::vector<int> >&, int, int)’:
foo.cc:25:11: warning: comparison of integer expressions of different signedness: ‘int’ and ‘std::vector<std::vector<int> >::size_type’ {aka ‘long unsigned int’} [-Wsign-compare]
   25 |     if(cur==data.size()) {
      |        ~~~^~~~~~~~~~~~~
foo.cc: In function ‘void solve2_1104(std::vector<std::vector<int> >&)’:
foo.cc:59:18: warning: comparison of integer expressions of different signedness: ‘int’ and ‘std::vector<std::vector<int> >::size_type’ {aka ‘long unsigned int’} [-Wsign-compare]
   59 |     for(int i=1;i<data.size();i++) {
      |                 ~^~~~~~~~~~~~