in reply to Comparing two arrays
I would try to use a hash to some advantage. For example, total up the sum of the entries and perhaps the index of the leftmost '1', then make that into a hash-key. The essential goal is to minimize the number of arrays that you actually search, no matter how you go about searching or representing them. The hash won't tell you which one (if any) matches, but only entries in that chosen bucket need be considered.