Now (13 March 2021) there are 6786 problems on Codeforces (my code on GitHub). 142 of them have no rating. What is problem complexity distribution for 6646 problems which have rating?
186 problems have no tags, but every problem may have more than 1 tag label, so there are 17006 tag labels in all problems. Tag distribution for all problems is here
Let's create a heatmap shown combination of tags and problem complexity. I split it up into two parts because of its size.
UPD. Not quite sure how to add a picture to comment:) wOoDeN_sPoOn asked about percentage of math problems in a contests