Right now I'm looking at 4 questions, and I think they are all similar:
http://stackoverflow.com/q/776624/1906044
http://stackoverflow.com/q/2524233/1906044
http://stackoverflow.com/q/14373934/1906044
http://stackoverflow.com/q/131241/1906044
They are all about c++ iterator vs index speed/efficiency, aren't they duplicates?