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Replace custom function with Enum.zip_with

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Adam Millerchip 2024-12-01 14:27:54 +09:00
parent b26f687dab
commit bf6fa2af47
1 changed files with 1 additions and 4 deletions
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2024/day1.exs
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@ -4,12 +4,9 @@ defmodule Day1 do
list1 = Enum.sort(list1) list1 = Enum.sort(list1)
list2 = Enum.sort(list2) list2 = Enum.sort(list2)
distances(list1, list2) |> Enum.sum() Enum.zip_with(list1, list2, &abs(&1 - &2)) |> Enum.sum()
end end
def distances([], []), do: []
def distances([h1 | t1], [h2 | t2]), do: [abs(h1 - h2) | distances(t1, t2)]
def part2({list1, list2}) do def part2({list1, list2}) do
frequencies = Enum.frequencies(list2) frequencies = Enum.frequencies(list2)
Enum.reduce(list1, 0, fn item, count -> count + item * Map.get(frequencies, item, 0) end) Enum.reduce(list1, 0, fn item, count -> count + item * Map.get(frequencies, item, 0) end)