I think this question is quite meta.
As part of a recruitment process, I was asked to solve some programming problem. They thought my code wasn't up to their standards, but I feel like I need more context to their feedback (which companies don't really bother supplying more of), and I'd really love to have it peer reviewed here. In one previous correspondence, they asked me not to share the problems they asked me to solve, but there was no mention of not sharing my own solution.