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z669016 (10) [Avatar] Offline

In the answer you have filtered the result after constructing the a list of pairs. I think you should seek to reduce the elements in the stream as early as you can. So, you should filter as part of the flatMap operation before you create the pairs:

i -> -> (j + i) % 3 == 0).map(j -> new int[]{i, j})

Of course it's just an example, but reducing (in numbers) the size of your stream early on will result in better performance.