/in/foo.cc: In function 'std::vector<int> maxI(int*, int)':
/in/foo.cc:16:13: warning: variable 'ri' set but not used [-Wunused-but-set-variable]
  int r = 0, ri;
             ^~
/in/foo.cc: In function 'int main()':
/in/foo.cc:55:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i = 0; i < mMd.size(); i++) {
                 ~~^~~~~~~~~~~~
/in/foo.cc:57:12: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   printf(i == mMd.size() - 1 ? "" : " ");
          ~~^~~~~~~~~~~~~~~~~
/in/foo.cc:62:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i = 0; i < mNd.size(); i++) {
                 ~~^~~~~~~~~~~~
/in/foo.cc:64:12: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   printf(i == mNd.size() - 1 ? "" : " ");
          ~~^~~~~~~~~~~~~~~~~