/in/foo.cc: In function 'int solve(std::__cxx11::string&)':
/in/foo.cc:41:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int i = 0; i < v.size(); i++){
                    ~~^~~~~~~~~~
/in/foo.cc:43:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         if(i > 0 && i == v.size() - 1) rank0[v[i].second]--;
                     ~~^~~~~~~~~~~~~~~
/in/foo.cc:36:9: warning: unused variable 'cat' [-Wunused-variable]
     int cat = cnt.size();
         ^~~