69 lines
1.2 KiB
Elixir
69 lines
1.2 KiB
Elixir
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defmodule AOC.Day2 do
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use AOC.Day, day: 2
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def parse_input(lines) do
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Enum.map(lines, fn line ->
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[move1, move2] =
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line
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|> String.split(" ")
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|> Enum.map(fn c ->
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c
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|> String.to_charlist()
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|> hd()
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end)
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{move1, move2}
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end)
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end
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def part1(input) do
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input
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|> Enum.map(fn {move1, move2} ->
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score =
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case move2 do
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?X -> 1
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?Y -> 2
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?Z -> 3
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end
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score +
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case {move1, move2} do
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{?A, ?Y} -> 6
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{?B, ?Z} -> 6
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{?C, ?X} -> 6
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{?A, ?X} -> 3
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{?B, ?Y} -> 3
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{?C, ?Z} -> 3
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_ -> 0
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end
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end)
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|> Enum.sum()
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end
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def part2(input) do
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input
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|> Enum.map(fn {move1, result} ->
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score =
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case result do
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?X -> 0
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?Y -> 3
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?Z -> 6
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end
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score +
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case {move1, result} do
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{?A, ?X} -> 3
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{?A, ?Y} -> 1
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{?A, ?Z} -> 2
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{?B, ?X} -> 1
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{?B, ?Y} -> 2
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{?B, ?Z} -> 3
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{?C, ?X} -> 2
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{?C, ?Y} -> 3
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{?C, ?Z} -> 1
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end
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end)
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|> Enum.sum()
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end
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end
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