Format for code for facebook hackercup

i know that we have to freopen input and output file
but we need the name of the input and output file.
So, from where to get those names for facebook hackercup?

Well the names are questionName_input, ans if question name has multiple words then they are separated by underscores.
Well download those files and rename it to what you had used in freopen or change name in freopen parameters after downloading them to be extra sure.