/in/foo.cc: In function 'int get_len()':
/in/foo.cc:66:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int i=0;i<path.size();i++) len+=path[i].val;
                 ~^~~~~~~~~~~~
/in/foo.cc: In function 'int f(int)':
/in/foo.cc:73:13: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     while (l<path.size()&&sum1+path[l].val<=x) {
            ~^~~~~~~~~~~~