Magic with 5 cards
The magician turns around to see nothing.
John: I just picked five cards.
Magician: Bot will tell me four of them and I will guess the fifth one.
Bot: Jack of diamonds, Ace of hearts, Queen of clubs, King of spades.
Magician: I see red, yeah it's of diamonds... And it's not a face... It's even pretty low... The three of diamonds, right?!
The magician quickly turns around to see John's face...
John: No way!
Magician: Told you!
John: It was just luck, do it again!
Magician: I can do it all day long, dummy.
Well, it's an automatic magic trick, that I will explain in a moment.
You will have to create two functions. A function named
bot
which will take five cards,
an integer and return four of them ; and a function named
magician
which will take four cards,
the same integer and return the fifth one.
The trick use the
standard 52-card deck
.
Cards will be represented like
'A ♥'
,
'3 ♦'
,
'K ♠'
,
'Q ♣'
,
'J ♦'
(
♣
for clubs,
♦
for diamonds,
♥
for hearts,
♠
for spades,
A for Ace, J for Jack, Q for Queen and K for King).
We will soon need to compare cards. The deck order is
.
To compare two cards, look ranks
A ♣
<
A ♦
<
A ♥
<
A ♠
<
2 ♣
<
...
A < 2 < ... < 10 < J < Q < K
,
then suits
(same order than with letters:
♣
<
♦
<
♥
<
♠
club < diamond < heart < spade
).
The card the bot choose to hide and the order of the four cards the bot says is crucial for the magician
so he can guess the fifth one. There are five cards, but only four suits so there are at least two cards
from the same suit, we name them
card A
and
card B
. The bot will hide one and say the other,
but which one? Imagine the thirteen cards in a circle,
clockwise
.
If going from
card A
to
card B
on this circle is quicker than going from
card B
to
card A
,
then we will hide
card B
, say
card A
, and the distance from
card A
to
card B
is noted as delta (it's necessarily a number between one and six). We still have three cards to say,
and since there are six ways to tell three cards, we can transmit "delta information".
The
card A
will be the starting point, then by "adding" delta to
card A
,
the magician can "guess" the fifth card.
Sort the three remaining cards, according to the above order, and note them
C1
,
...
At this point, the bot have two things to say: the
| bot | magician | |
|---|---|---|
| Input | Five strings and an integer | Four strings and an integer |
| Output | A list/tuple of four strings | A string |
bot('A ♥', '3 ♦', 'K ♠', 'Q ♣', 'J ♦', n=1) == ['J ♦', 'A ♥', 'Q ♣', 'K ♠']
magician('J ♦', 'A ♥', 'Q ♣', 'K ♠', n=1) == '3 ♦'
How it is used: To amaze and impress people with your magic skills.
CheckiO Extensions allow you to use local files to solve missions. More info in a blog post.
In order to install CheckiO client you'll need installed Python (version at least 3.8)
Install CheckiO Client first:
pip3 install checkio_client
Configure your tool
checkio --domain=py config --key=
Sync solutions into your local folder
checkio sync
(in beta testing) Launch local server so your browser can use it and sync solution between local file end extension on the fly. (doesn't work for safari)
checkio serv -d
Alternatevly, you can install Chrome extension or FF addon
checkio install-plugin
checkio install-plugin --ff
checkio install-plugin --chromium
Read more here about other functionality that the checkio client provides. Feel free to submit an issue in case of any difficulties.
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