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https://www.codeabbey.com/index/task_list/challenges
The "BCD to Hex" problem as well as the "Micro-Life" problem should be included in this list.
Vadim, Hi!
Sorry for this organization into volumes is a bit misleading. Volumes are oldest attempt to group tasks and it was supposed every task can below to some specific (single) volume. Thus these two tasks belong to Assembly volume.
Soon enough I found there is no unambiguous way to make such partitions, so instead of them tags were introduced. Though they caused some unhappiness among the people who get used to volumes - exactly because task may be included under several tags... :)
Most queer is that I don't remember, for example, how to assign recently added tasks to volumes... Perhaps we have to retire them one day... :)
I see, that makes sense. Something that would be nice though would be to have a quick way to reference which problems are challenges. Otherwise if a user wants to revisit challenges to get a better ranking on it, they'd have to either remember which problems are challenges, or check a bunch of problems. A way to ammend this would be to have a list of tags, but then that's kind of the same as having volumes, except that they need not be disjoint.
Also, I now realize that actually one can view a, well not exactly a list, but a collection of tags swirling around with Problems > Filter by tag button near the top of the problem list.
Well, anyways, not a huge deal, I can just make a bookmark to https://www.codeabbey.com/index/task_list/challenge
Which filters the problems by which ones have the challenge tag.