/in/foo.cc: In function 'int main()':
/in/foo.cc:56:31: warning: format '%d' expects argument of type 'int', but argument 3 has type 'std::vector<int>::size_type {aka long unsigned int}' [-Wformat=]
  printf("%d %d\n",MAX,k.size());
                               ^
/in/foo.cc:57:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for (int i=0;i<k.size()-1;i++) printf("%d ",k[i]);
               ~^~~~~~~~~~~