Day 1 Notes

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Part1:
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$ elixir day1part1.exs
618 x 1402 = 866436

Thoughts:

Avoid iterating seen elements by consuming the list, and comparing each list element only to the remaining
elements.

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Part2:
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$ elixir day1part2.exs
547 x 545 x 928 = 276650720

Thoughts:

Use a comprehension over two versions of the remaining list to efficiently compare the three items.