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I have a sequence of SQL calls, which I want to use to detect loops (and hence unnecessary duplicate sql calls), but it got me thinking of this more general problem.
Given a list, say [a,b,c,b,c,a,b,c,b,c,a,b,b]
Is there some way I can turn that into a,[[b,c]*2,a]*2,b*2
or, [a,[b,c]*2]*2,a,b*2
That is, detect repetitions (possibly nested ones).
Look into the Lempel-Ziv-Welsh compression algorithm. It is built on detecting repetitions in strings and utilizing them for compression. I believe you can use a Trie for it.