/in/foo.cc: In function 'void solve(int, std::vector<std::pair<int, int> >&)':
/in/foo.cc:34:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int i=1;i<herbs.size();i++) {
                 ~^~~~~~~~~~~~~
/in/foo.cc:27:9: warning: unused variable 'inf' [-Wunused-variable]
     int inf = -int(pow(10,9)) - 1;
         ^~~