After once through the normal Project Euler, I will move on to ProjectEuler+ on HackerRank. The challenges are basically the same but the test cases are hidden (and include edge case tests) and computation time and resources are limited.
I tend to try first in C and then, once solved, move into a different language such as Java or Python. As such, my final solutions are often quite... non-idiomatic. Like, really not idiomatic at all. I have this horrible tendency to try to translate my methods "word for word" from C into other languages. It's exactly as ineffective as it seems.
The struggle is real.
I also have not bothered to comment most of these solutions although if I were particularly proud of one I may take the time to comment/narrate it thoroughly.
Some of the first solutions were copy and pasted from my own solutions on HackerRank ProjectEuler+, where the secret test files are input rather than a hardcoded value as per original Projet Euler.
As a result there may be some scanning in and printing out of various values that wouldn't suit the normal project euler problems.
This is just a low-priority housekeeping issue which I intend to address sometime in the next month (after exams).