44 lines
972 B
Elixir
44 lines
972 B
Elixir
import AOC
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import AOCHelpers
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aoc 2023, 13 do
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def p1(input) do
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input
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|> String.split("\n\n")
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|> Enum.map(&lines_of_chars/1)
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|> Enum.map(&summarize/1)
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|> Enum.sum()
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end
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def p2(_input) do
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end
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def summarize(lines) do
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vertical_line_of_reflection = find_reflection_index(lines)
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horizontal_line_of_reflection = lines |> transpose() |> find_reflection_index()
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summary = vertical_line_of_reflection + 100 * horizontal_line_of_reflection
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summary
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end
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def find_reflection_index(lines) do
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len = lines |> List.first() |> length()
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idx =
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for i <- 1..(len - 1) do
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lines
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|> Enum.all?(fn line ->
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line
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|> Enum.split(i)
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|> Tuple.to_list()
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|> map_list([&Enum.reverse/1, &id/1])
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|> Enum.zip_with(&apply(Kernel, :==, &1))
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|> Enum.all?(is?(true))
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end)
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end
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|> Enum.find_index(is?(true))
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if idx, do: idx + 1, else: 0
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end
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end
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