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#!/usr/bin/env elixir
defmodule PWC do
def twiceAppearance([], _), do: "␀" # fallback
def twiceAppearance([next | rest], count) do
if Map.has_key?(count, next) do
next
else
twiceAppearance(rest, Map.put(count, next, 1))
end
end
def twiceAppearance(str) do
# split the string into characters and
# reprocess with an empty Map
twiceAppearance(String.graphemes(str), %{})
end
def solution(str) do
IO.puts("Input: $str = \"#{str}\"")
IO.puts("Output: \"#{twiceAppearance(str)}\"")
end
end
IO.puts("Example 1:")
PWC.solution("acbddbca")
IO.puts("\nExample 2:")
PWC.solution("abccd")
IO.puts("\nExample 3:")
PWC.solution("abcdabbb")
IO.puts("\nExample 4:")
PWC.solution("abcdefg")
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