Based on 4 reported problems, Stripe interviews are slightly harder than average - 25% Hard vs 18% across all companies. The majority (75%) of questions are Medium difficulty, which is typical for companies that want to see solid fundamentals without excessive trick questions.
Compared to the industry average, Stripe puts unusual emphasis on shortest-path (50% of problems, 101.5x the industry average), graph (75% of problems, 23.1x the industry average), breadth-first-search (50% of problems, 5.8x the industry average). If you're short on time, these are the categories to double down on.
The most common topics are graph (75%), string (50%), array (50%), depth-first-search (50%). Problems below are sorted by frequency, the ones at the top are asked most often.