The Champernowne word
1234567891011121314151617181920212223…, also known as the counting series, is an infinitely long string of digits made up of all positive integers written out in ascending order without any separators. This function should return the digit at position
n of the Champernowne word. Position counting again starts from zero.
Click this line if you need a hint.
This infinite sequence starts with nine single-digit numbers, followed by ninety two-digit numbers, followed by nine hundred three-digit numbers, and so on. Once you reach the block of k-digit numbers that contains the position n, the digit in that position is best determined with integer arithmetic, perhaps aided by an
str conversion for access to digit positions.
Input: Integer (int).
Output: Integer (int).
assert counting_series(0) == 1 assert counting_series(10) == 0 assert counting_series(100) == 5
The mission was taken from Python CCPS 109. It is taught for Ryerson Chang School of Continuing Education by Ilkka Kokkarinen
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
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!
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