Chemical Analysis Chemical Analysis
Undefined
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As the input you will get the chemical formula and the number N. Your task is to create a list of the chemical elements, which are in the formula in the amount of >= N.
Pay attention, that in the some formulas will be used brackets - () and []. This article will help you to open the brackets and don't make mistake while counting.

Input: Chemical formula and the number of atoms.

Output: List of the chemical elements, sorted in the alphabetical order.

Example:

atoms('C2H5OH', 2) == ['C', 'H']
atoms('H2O', 2) == ['H']
atoms('Mg(OH)2', 1) == ['H', 'Mg', 'O']
atoms('K4[ON(SO3)2]2', 4) == ['K', 'O', 'S']

How it is used: For chemical analysis.

Precondition :
1 <= different elements <= 10

Settings
Code:
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.

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