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So,
pairwise([0, 0, 0, 0, 1, 1], 1) should return 10.
What I think you’re missing is that you can have more than one pair.
You take the first 0 and the first 1 --> 0+4=4
You take the second 0 and the second 1 --> 1+5=6
Then, 4+6=10
You need to add all sums, and always use first the ones with lower index.
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