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550b652b45
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522bbf2dee
4 changed files with 0 additions and 235 deletions
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defmodule Day1 do
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def part1(<<>>), do: 0
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def part1(<<?(, rest::binary>>), do: 1 + part1(rest)
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def part1(<<?), rest::binary>>), do: -1 + part1(rest)
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def part2(input), do: find_basement(input, _floor = 0, _pos = 1)
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def find_basement(<<?), _::binary>>, 0, pos), do: pos
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def find_basement(<<?), rest::binary>>, floor, pos), do: find_basement(rest, floor - 1, pos + 1)
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def find_basement(<<?(, rest::binary>>, floor, pos), do: find_basement(rest, floor + 1, pos + 1)
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def input do
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with [input_filename] <- System.argv(),
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{:ok, input} <- File.read(input_filename) do
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input
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else
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_ -> :error
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end
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end
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#######################
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# HERE BE BOILERPLATE #
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#######################
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def run do
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case input() do
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:error -> print_usage()
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input -> run_parts_with_timer(input)
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end
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end
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defp run_parts_with_timer(input) do
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run_with_timer(1, fn -> part1(input) end)
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run_with_timer(2, fn -> part2(input) end)
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end
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defp run_with_timer(part, fun) do
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{time, result} = :timer.tc(fun)
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IO.puts("Part #{part} (completed in #{format_time(time)}):\n")
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IO.puts("#{result}\n")
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end
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defp format_time(μsec) when μsec < 1_000, do: "#{μsec}μs"
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defp format_time(μsec) when μsec < 1_000_000, do: "#{μsec / 1000}ms"
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defp format_time(μsec), do: "#{μsec / 1_000_000}s"
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defp print_usage do
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IO.puts("Usage: elixir day1.exs input_filename")
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end
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end
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Day1.run()
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defmodule Day2 do
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def part1(input) do
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input
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|> Enum.map(fn [x, y, z] ->
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a = x * y
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b = x * z
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c = y * z
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min = Enum.min([a, b, c])
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2 * (a + b + c) + min
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end)
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|> Enum.sum()
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end
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def part2(input) do
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input
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|> Enum.map(fn box ->
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[x, y, z] = Enum.sort(box)
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2 * (x + y) + x * y * z
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end)
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|> Enum.sum()
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end
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def input do
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with [input_filename] <- System.argv(),
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{:ok, input} <- File.read(input_filename) do
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input
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|> String.split(["\n", "x"], trim: true)
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|> Enum.map(&String.to_integer/1)
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|> Enum.chunk_every(3)
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else
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_ -> :error
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end
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end
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#######################
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# HERE BE BOILERPLATE #
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#######################
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def run do
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case input() do
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:error -> print_usage()
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input -> run_parts_with_timer(input)
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end
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end
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defp run_parts_with_timer(input) do
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run_with_timer(1, fn -> part1(input) end)
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run_with_timer(2, fn -> part2(input) end)
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end
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defp run_with_timer(part, fun) do
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{time, result} = :timer.tc(fun)
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IO.puts("Part #{part} (completed in #{format_time(time)}):\n")
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IO.puts("#{result}\n")
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end
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defp format_time(μsec) when μsec < 1_000, do: "#{μsec}μs"
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defp format_time(μsec) when μsec < 1_000_000, do: "#{μsec / 1000}ms"
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defp format_time(μsec), do: "#{μsec / 1_000_000}s"
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defp print_usage do
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IO.puts("Usage: elixir day2.exs input_filename")
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end
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end
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Day2.run()
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defmodule Day3 do
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def part1(input), do: move(input, MapSet.new([{0, 0}]), {0, 0})
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def move(<<?<, rest::binary>>, houses, {x, y}), do: deliver(rest, houses, {x - 1, y})
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def move(<<?>, rest::binary>>, houses, {x, y}), do: deliver(rest, houses, {x + 1, y})
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def move(<<?^, rest::binary>>, houses, {x, y}), do: deliver(rest, houses, {x, y - 1})
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def move(<<?v, rest::binary>>, houses, {x, y}), do: deliver(rest, houses, {x, y + 1})
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def move(<<>>, houses, _addr), do: MapSet.size(houses)
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def deliver(moves, houses, addr), do: move(moves, MapSet.put(houses, addr), addr)
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def part2(input), do: move2(input, MapSet.new([{0, 0}]), {0, 0}, {0, 0})
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def move2(<<ms, mb, rest::binary>>, houses, santa, bot) do
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santa = next(ms, santa)
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bot = next(mb, bot)
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move2(rest, MapSet.union(houses, MapSet.new([santa, bot])), santa, bot)
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end
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def move2(<<>>, houses, _santa, _bot), do: MapSet.size(houses)
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def next(?<, {x, y}), do: {x - 1, y}
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def next(?>, {x, y}), do: {x + 1, y}
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def next(?^, {x, y}), do: {x, y - 1}
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def next(?v, {x, y}), do: {x, y + 1}
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def input do
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with [input_filename] <- System.argv(),
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{:ok, input} <- File.read(input_filename) do
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input
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else
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_ -> :error
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end
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end
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#######################
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# HERE BE BOILERPLATE #
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#######################
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def run do
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case input() do
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:error -> print_usage()
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input -> run_parts_with_timer(input)
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end
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end
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defp run_parts_with_timer(input) do
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run_with_timer(1, fn -> part1(input) end)
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run_with_timer(2, fn -> part2(input) end)
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end
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defp run_with_timer(part, fun) do
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{time, result} = :timer.tc(fun)
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IO.puts("Part #{part} (completed in #{format_time(time)}):\n")
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IO.puts("#{result}\n")
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end
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defp format_time(μsec) when μsec < 1_000, do: "#{μsec}μs"
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defp format_time(μsec) when μsec < 1_000_000, do: "#{μsec / 1000}ms"
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defp format_time(μsec), do: "#{μsec / 1_000_000}s"
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defp print_usage do
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IO.puts("Usage: elixir day3.exs input_filename")
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end
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end
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Day3.run()
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defmodule Day4 do
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def part1(input), do: mine(input, 1, "00000")
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def mine(input, nonce, prefix) do
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hash = :crypto.hash(:md5, input <> Integer.to_string(nonce)) |> Base.encode16()
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if String.starts_with?(hash, prefix), do: nonce, else: mine(input, nonce + 1, prefix)
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end
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def part2(input), do: mine(input, 1, "000000")
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def input do
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with [input] <- System.argv() do
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input
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else
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_ -> :error
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end
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end
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#######################
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# HERE BE BOILERPLATE #
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#######################
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def run do
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case input() do
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:error -> print_usage()
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input -> run_parts_with_timer(input)
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end
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end
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defp run_parts_with_timer(input) do
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run_with_timer(1, fn -> part1(input) end)
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run_with_timer(2, fn -> part2(input) end)
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end
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defp run_with_timer(part, fun) do
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{time, result} = :timer.tc(fun)
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IO.puts("Part #{part} (completed in #{format_time(time)}):\n")
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IO.puts("#{result}\n")
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end
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defp format_time(μsec) when μsec < 1_000, do: "#{μsec}μs"
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defp format_time(μsec) when μsec < 1_000_000, do: "#{μsec / 1000}ms"
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defp format_time(μsec), do: "#{μsec / 1_000_000}s"
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defp print_usage do
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IO.puts("Usage: elixir day4.exs input")
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end
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end
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Day4.run()
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