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Better variable names, extract next_num function

This commit is contained in:
Adam Millerchip 2020-12-16 09:08:31 +09:00
parent de859650bc
commit 9ba86e15c4
1 changed files with 11 additions and 10 deletions
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21
day15/day15.exs
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@ -8,22 +8,23 @@ defmodule Day15 do
|> IO.puts()
end
def start([], last, round, stop, state), do: play(last, round, stop, state)
def start([], prev_num, round, stop, state), do: play(prev_num, round, stop, state)
def start([num | rest], _last, round, stop, state) do
def start([num | rest], _prev_num, round, stop, state) do
start(rest, num, round + 1, stop, Map.put(state, num, {round, round}))
end
def play(num, stop, stop, state) do
{a, b} = state[num]
b - a
def play(prev_num, stop, stop, state), do: next_num(prev_num, state)
def play(prev_num, round, stop, state) do
num = next_num(prev_num, state)
state = Map.update(state, num, {round, round}, fn {_a, b} -> {b, round} end)
play(num, round + 1, stop, state)
end
def play(num, round, stop, state) do
{a, b} = state[num]
say = b - a
state = Map.update(state, say, {round, round}, fn {_a, b} -> {b, round} end)
play(say, round + 1, stop, state)
def next_num(prev_num, state) do
{a, b} = state[prev_num]
b - a
end
end