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char lists instead of UTF-8 encoded binaries are a better fit for this task #1

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char lists instead of UTF-8 encoded binaries are a better fit for this task #1

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38 changes: 20 additions & 18 deletions day1.ex
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Original file line number Diff line number Diff line change
Expand Up @@ -27,16 +27,16 @@ defmodule Day1 do

def floor(instructions), do: step(instructions, 0)

defp step("", floor), do: floor
defp step("(" <> instructions, floor), do: step(instructions, floor + 1)
defp step(")" <> instructions, floor), do: step(instructions, floor - 1)
defp step([], floor), do: floor
defp step( [?( | instructions], floor), do: step(instructions, floor + 1)
defp step( [?) | instructions], floor), do: step(instructions, floor - 1)

def basement(instructions), do: step_basement(instructions, 0, 1)

defp step_basement("", _, _), do: 0
defp step_basement(")" <> _, 0, position), do: position
defp step_basement("(" <> instructions, floor, position), do: step_basement(instructions, floor + 1, position + 1)
defp step_basement(")" <> instructions, floor, position), do: step_basement(instructions, floor - 1, position + 1)
defp step_basement([], _, _), do: 0
defp step_basement([?) | _ ], 0, position), do: position
defp step_basement([?( | instructions], floor, position), do: step_basement(instructions, floor + 1, position + 1)
defp step_basement([?) | instructions], floor, position), do: step_basement(instructions, floor - 1, position + 1)

end

Expand All @@ -47,35 +47,37 @@ defmodule Day1Test do
use ExUnit.Case, async: true

test "floor" do
assert 0 == Day1.floor("(())")
assert 0 == Day1.floor("()()")
assert 0 == Day1.floor('(())')
assert 0 == Day1.floor('()()')

assert 3 == Day1.floor("(((")
assert 3 == Day1.floor("(()(()(")
assert 3 == Day1.floor("))(((((")
assert 3 == Day1.floor('(((')
assert 3 == Day1.floor('(()(()(')
assert 3 == Day1.floor('))(((((')

assert -1 == Day1.floor("())")
assert -1 == Day1.floor("))(")
assert -1 == Day1.floor('())')
assert -1 == Day1.floor('))(')

assert -3 == Day1.floor(")))")
assert -3 == Day1.floor(")())())")
assert -3 == Day1.floor(')))')
assert -3 == Day1.floor(')())())')
end

test "basement" do
assert 1 == Day1.basement(")")
assert 5 == Day1.basement("()())")
assert 1 == Day1.basement(')')
assert 5 == Day1.basement('()())')
end

test "input floor" do
IO.puts "floor"
File.read!("day1.txt")
|> to_char_list
|> Day1.floor
|> IO.puts
end

test "input basement" do
IO.puts "basement"
File.read!("day1.txt")
|> to_char_list
|> Day1.basement
|> IO.puts
end
Expand Down