/in/foo.cc: In function 'std::pair<int, std::vector<int> > input_1304()':
/in/foo.cc:53:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int i=0;i<s.length();i++) {
                 ~^~~~~~~~~~~
/in/foo.cc:54:25: error: 'isnumber' was not declared in this scope
         if(isnumber(s[i])) {
                         ^