/in/foo.cc: In function 'int main()':
/in/foo.cc:74:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for (int i = 0; i < path.size(); ++i)
                  ~~^~~~~~~~~~~~~
/in/foo.cc:79:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for (int i = 0; i < necklace.size();++i)
                  ~~^~~~~~~~~~~~~~~~~