cpp Add missing practice exercises

Hey,

This is a list of all missing (not deprecated) exercises in the C++ track.

Let me know which one you’re picking up, and then go ahead and start the PR. I’ll maintain and update the list accordingly.

[ ] baffling-birthdays (@marcelweikum) #977
[ ] book-store (@marcelweikum) #974
[ ] bottle-song (@marcelweikum) #979
[ ] bowling (@marcelweikum) #982
[ ] change (@marcelweikum) #983
[ ] connect (@marcelweikum) #984
[ ] custom-set
[ ] dominoes
[ ] dot-dsl — (canonical-data.json missing)
[ ] error-handling — (canonical-data.json missing)
[ ] flatten-array
[ ] forth
[ ] game-of-life
[ ] go-counting
[ ] grep
[ ] hangman — (canonical-data.json missing)
[ ] house
[ ] intergalactic-transmission
[ ] killer-sudoku-helper
[ ] ledger
[ ] lens-person — (canonical-data.json missing)
[ ] markdown
[ ] matrix
[ ] micro-blog
[ ] ocr-numbers
[ ] paasio — (canonical-data.json missing)
[ ] palindrome-products
[ ] piecing-it-together
[ ] poker
[ ] pov
[ ] proverb
[ ] pythagorean-triplet
[ ] rational-numbers
[ ] react
[ ] rectangles
[ ] relative-distance
[ ] resistor-color-trio
[ ] rest-api
[ ] saddle-points
[ ] satellite
[ ] sgf-parsing
[ ] simple-cipher
[ ] split-second-stopwatch
[ ] square-root
[ ] state-of-tic-tac-toe
[ ] strain
[ ] swift-scheduling
[ ] tournament
[ ] transpose
[ ] tree-building — (canonical-data.json missing)
[x] twelve-days (@alienx5499) #992
[ ] variable-length-quantity
[ ] word-search
[ ] wordy
[ ] zipper

Not sure how to get started? This might help: Practice Exercises

Happy coding!

May 14 '25 17:05 marcelweikum

Hello. Thanks for opening an issue on Exercism 🙂

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May 14 '25 17:05 github-actions[bot]

Hi @marcelweikum,

I'd like to pick up twelve-days from the missing exercises list.

I'll start working on the implementation and create a PR once it's ready.

Thanks!

Jul 07 '25 12:07 alienx5499

Hi @marcelweikum,

I've completed the twelve-days exercise implementation in #992.

Could you please review and merge the PR?

Thanks!

Jul 07 '25 13:07 alienx5499

@alienx5499 If I find the time I can review it. For merging, the maintainers have to look over it and the checks need to pass after reopening. Don't worry, it won't get lost (your PR is listed above). Nonetheless it could take some time.

Jul 07 '25 13:07 marcelweikum

@marcelweikum Thank you! If you find some free time, I'd really appreciate it if you could review it. Also, I’m not familiar with the maintainers here would it be possible for you to tag or let one of them know? That would be a big help. 🙏

Jul 07 '25 13:07 alienx5499