48 lines
1.1 KiB
Elixir
48 lines
1.1 KiB
Elixir
defmodule DayTwo do
|
|
def part_one(input) do
|
|
lines = String.split(input, "\n") |> Enum.map(&String.codepoints/1)
|
|
|
|
two =
|
|
Enum.map(lines, fn string -> DayTwo.check_occurence(string, 2) end)
|
|
|> Enum.filter(& &1)
|
|
|
|
three =
|
|
Enum.map(lines, fn string -> DayTwo.check_occurence(string, 3) end)
|
|
|> Enum.filter(& &1)
|
|
|
|
length(two) * length(three)
|
|
end
|
|
|
|
def check_occurence(line, req) do
|
|
size =
|
|
Enum.reduce(line, %{}, fn x, acc -> Map.update(acc, x, 1, &(&1 + 1)) end)
|
|
|> Enum.into([])
|
|
|> Enum.filter(fn {_, count} -> count == req end)
|
|
|> length
|
|
|
|
size > 0
|
|
end
|
|
|
|
def part_two(input) do
|
|
lines = String.split(input, "\n") |> Enum.map(&String.codepoints/1)
|
|
|
|
Enum.map(lines, fn line ->
|
|
Enum.map(lines, fn linetwo ->
|
|
diff = compare_strings(line, linetwo)
|
|
|
|
if diff == 1 do
|
|
IO.puts("#{line} #{linetwo}")
|
|
end
|
|
end)
|
|
end)
|
|
|
|
nil
|
|
end
|
|
|
|
def compare_strings(one, two) do
|
|
Enum.zip(one, two)
|
|
|> Enum.filter(fn {one, two} -> one != two end)
|
|
|> length
|
|
end
|
|
end
|