Comments by Member 13711733 (Top 4 by date)

That's not my definition of repetition. For me repetition is a subsequence that occurs at least twice int the sequence.
121212 - 1212
11211 - 11
111211 - 11
and so on.

In your case if 1212123212 returns 121212, than 11211 should return 111, not 11.

Thanks! But I can't rework it to do the magic without jumping. Do you think it can be done with input

new [] {1, 2, 1, 2, 1, 2, 3, 2, 1, 2})

to return

new [] {1, 2, 1, 2}