PathPrep — Coding Interview Prep by Concept
Coding interview practice organized by underlying concept rather than by topic list, so you learn the patterns that transfer across problems instead of memorizing individual questions.
In plain terms: This study tool helps you prepare for coding interviews by organizing practice problems by underlying concept. You can work through connected questions to learn problem-solving patterns rather than memorizing individual solutions.
From the site: PathPrep is a guided coding-interview study tool. Navigate a graph of LeetCode-style problems connected by the techniques that solve them, so concepts actually click.
Why I recommend it: Concept-first beats grinding a problem list. If you can name the pattern out loud, you can usually solve the variant they actually ask.