Created
December 2, 2018 08:04
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adevent of code problem 1.2
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defmodule Calibrate do | |
def prob1(freqs), do: Enum.reduce(freqs, 0, &Kernel.+/2) | |
def prob2(freqs), do: prob2(freqs, %{last: 0}, freqs) | |
def prob2([], mem, freqs), do: prob2(freqs, mem, freqs) | |
def prob2([h | t], %{last: last} = mem, freqs) do | |
n = last + h | |
case mem[n] do | |
nil -> prob2(t, Map.merge(mem, %{:last => n, n => true}), freqs) | |
true -> n | |
end | |
end | |
end |
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TIL 👍