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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
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If you want, you can do this in one line
Index of (5,5) = (1,5) : Highest index = 5
Index of (3,7) = (3,4) : Highest index = 4
The pair with the lower value of highest index seems to be the answer
Could you explain me please a bit further why the correct answer is [3, 7] and not [5,5]? It is because the indexes for the second match are closer?
sum_pairs([10, 5, 2, 3, 7, 5], 10)
^-----------^ 5 + 5 = 10, indices: 1, 5
^--^ 3 + 7 = 10, indices: 3, 4 *
* entire pair is earlier, and therefore is the correct answer
== [3, 7]
Oh, got it, thank you I usually think in terms of for's and if's
Is there a mathematical property to use?