Aurélien Geron
27 lines
713 B
Elixir
27 lines
713 B
Elixir
defmodule Aoc2024.Day03 do
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def part1(instructions) do
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~r/mul\(([0-9]+),([0-9]+)\)/
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|> Regex.scan(instructions)
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|> Enum.map(fn [_all, num1_str, num2_str] ->
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case {Integer.parse(num1_str), Integer.parse(num2_str)} do
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{{num1, ""}, {num2, ""}} -> num1 * num2
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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(instructions) do
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conditional_instructions =
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~r/don't\(\).*?do\(\)/s
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|> Regex.replace(instructions, "|")
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# handle possible case where the instructions end with don't() and more mul
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conditional_instructions2 =
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~r/don't\(\).*$/s
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|> Regex.replace(conditional_instructions, "|")
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part1(conditional_instructions2)
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end
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end
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