K=. 2 2 1 1 2 1 2 2 1 2 2 1 1 2 1 1 2 2 1 2 1 1 2 1 2 2 1 1 2 1 1 2 1 2 2 1
2 2 1 1 2 1 2 2 1 2 1 1 2 1 1 2 2 1 2 2 1 1 2 1 2 2 1 2 2 1 1 2 1 1 2 1 2 2
1 2 1 1 2 2 1 2 2 1 1 2 1 2 2 1 2 2 1 1 2 1 1 2 2 1 2 1 1 2 1 2 2 1 2 2 1 1
is the start of a sequence where each i-th number gives the length of the
i-th substring of equal numbers.
Or in J
(}:#;.(2)~ 2~:/\]) K
2 2 1 1 2 1 2 2 1 2 2 1 1 2 1 1 2 2 1 2 1 1 2 1 2 2 1 1 2 1 1 2 1 2 2 1 2 2
1 1 2 1 2 2 1 2 1 1 2 1 1 2 2 1 2 2 1 1 2 1 2 2 1 2 2 1 1 2 1 1 2 1 2
(Partial) equality from
((]-: ({.~ #)) }:#;.(2)~ 2~:/\]) K
1
I do have a way to generate them (not by hand), but what are other ways?
Elegant and lean svp.
The first 21717701 items I generated in
ts 'genREB 2'
0.9922127 8.0530995e8
R.E. Boss
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