You can find my solutions for Google's Code Jam coding championship.
There may be competitive and practice submissions for the rounds. You can read the summary for my competitive submissions below.
After the rounds, I usually try to improve myself by reading the analysises and solving the problems without time limit. I put these submissions into the practice folders, and indicate in the folder name, if it does not solve all the test sets.
The code quality of the solutions is not the quality I'd commit into a pet or work project's repo. It's not very readable, and could bear some refactor. Or a lot. But here the readability and maintainability doesn't really matter, but being fast does.
Between rounds, I've created a skeleton for 3 different types of problems: problems with one line input, with multiple line inputs, and interactive problems.
During competition, I just copy these skeletons and extend them with the logic.
Every round has an npm run tdd2020-1b like command to run the unit tests and rerun them on any file change for implementing the solution. Also, there is an npm test command to run all the tests, and get rid of exclusive tests (--forbid-only).
.vscode/launch.json contains config for debugging the solutions in their unit test environment.