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Pancake numbers are an obscure number theory sequence, defined as:

pancake(n) = smallest number of "pancake stack flips" to get the worst case stack-of-n-pancakes sorted. p(1)=0; p(2)=1 [casse ba], p(3)=3]; p(18) unknown

A collection of C ADTs (hash:str->str; longhash:str->long; intlist: list(int); strlist: list(str); set:str->boolean)