/in/foo.cc: In function 'std::vector<int> getbinary(int)':
/in/foo.cc:10:9: warning: unused variable 'b' [-Wunused-variable]
     int b = x%2;
         ^
/in/foo.cc: In function 'int getbase(std::vector<int>, int)':
/in/foo.cc:18:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for (int i=0; i<xishu.size(); i++){
                 ~^~~~~~~~~~~~~