Editorial for Max's Anger Contest Series 2 P2 - Password Anger
                Remember to use this editorial only when stuck, and not to copy-paste code from it. Please be respectful to the problem author and editorialist.
Submitting an official solution before solving the problem yourself is a bannable offence.
                Submitting an official solution before solving the problem yourself is a bannable offence.
Author:
Brute force all possible passwords with recursion (or through iteration) that have length  and count the number that hash to 
 with the given function.
Time Complexity: 
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