Combined Resistors

Combined Resistors

The mission is in Reviewing Mode. You can't see the solutions Leader Board, but you can see other user solutions through the Random Review after you solve the mission.
Combined Resistors.

The spaceship's crew is in serious trouble now since the electronic circuit board for warp-speed-engine-control has blown, they're stalled in outher space. A resistor on the cicuit board has turned into a pile of smoking carbon but luckily, someone found in the service documents what value it has to replace it with.

But after hours and hours searching thru the box with spare parts over and over, the horrified conclusion is that the requested resistor is not there.

However maybe . . . will they be able to make a combination of resistors which then will serve as a replacement and save their souls?

It is up to you now !

The Mission :

You have to write a function `combine: box, ohms → combination`

where `box` is a list of lists representing the box of spare parts, `ohms` the requested resistor and `combination` a list describing the wiring of the components in the folowing way :

Numbers in the combination list are series connected. Sub-lists however are parallel branches and can contain series connected components as well other sub-lists again.

Thus in each list: items are series and nested sub lists are parallel paths.

A few examples:


Fig.1: R1 series R2 = [1, 2]

Fig.2: R1 and R2 parallel = [[1], [2]]

Fig.3: R1 series (R2 parallel R3) = [1, [[2], [3]]

Fig.4: (R1 series R2) parallel (R3 series R4) = [[1, 2], [3, 4]]

Fig.5: (R1 parallel R3) series (R2 parallel R4) = [[1], [3]], [[2], [4]]]


The on the mission involved mathematics :

You can calculate the total resistance of two resistors (R1, R2) series connected (Rs) by:

Rs = R1 + R2

And the calculation for two resistors (R1, R2) parallel connected (Rp) is:

Rp = 1 / (1 / R1 + 1 / R2) Which can also be written as : Rp = R1 * R2 / (R1 + R2)

How it is used:
Electric circuitry.

Invalid hot key. Each hot key should be unique and valid
Hot keys:
CheckiO Extensions

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.

Pair Programming (Beta-version)

Welcome to Pair Programming! Engage in real-time collaboration on coding projects by starting a session and sharing the provided unique URL with friends or colleagues. This feature is perfect for joint project development, debugging, or learning new skills together. Simply click 'Start Session' to begin your collaborative coding journey!

Waiting for Pair Programming to start...

You are trying to join a pair programming session that has not started yet.

Please wait for the session creator to join.

Waiting for Pair Programming to reconnect...

It looks like the creator of the pair programming session closed the editor window.

It might happen accidentally, so that you can wait for reconnection.

<< <
> >>
exec show

Whats Next?

Free accounts will see Best CheckiO solutions with some delay.
Best Solutions will be opened in a moment
Become Awesome and Don't wait
The next stage is ""
Will be activated in
View More Solutions Random Review Solutions Go to the next mission