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.
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.
1 <= different elements <= 10
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
(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 --ff
checkio install-plugin --chromium