Created
December 27, 2016 14:30
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Hacker rank sock-merchant solution for elixir.
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https://www.hackerrank.com/challenges/sock-merchant | |
defmodule Solution do | |
def duplicate_socks() do | |
read = IO.read :all | |
[_ | result] = String.split(read, ~r/\W/, trim: true) | |
#IO.write(:stdio, result) | |
accum = find_duplication(result, %{}) | |
result = Enum.reduce(Map.keys(accum), 0, fn(key, acc) -> | |
acc = acc + div(accum[key] , 2) | |
end) | |
IO.write(:stdio, result) | |
end | |
def find_duplication([head | tail], accumulator) do | |
accumulator = if Map.has_key?(accumulator, head) do | |
acc = accumulator[head] + 1 | |
Map.put(accumulator, head, acc) | |
else | |
Map.put(accumulator, head, 1) | |
end | |
find_duplication(tail, accumulator) | |
end | |
def find_duplication([], accumulator) do | |
accumulator | |
end | |
end | |
Solution.duplicate_socks() |
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