iostream vs stdio.h

why stdio works faster than iostream? http://www.codechef.com/FEB14/status/TWODOGS,raul1rnjn535_3
The only difference between the two accepted solutions is that one contains iostream & the other does not.
Same for two accepted solutions here–http://www.codechef.com/FEB14/status/LCPESY,raul1rnjn535_3 .with iostream it took 0.05 sec & without iostream it took only 0.01 seconds.

bro, it would be nice if you dont share answers for an ongoing competition

anyway, imho your answer lies here maybe: http://stackoverflow.com/questions/17290144/stdio-vs-iostream

//