DraftKings Software Developer interview questions

Got the discounts-customers question mentioned by other posters. The question itself was not hard, but the interviewer was condescending, non-communicative, and judgy. I let them know ahead of time that I'm coding in a language that I haven't used in several years, so they were understanding of my syntactic limitations, but the snobby attitude along with poor lighting on their end made the atmosphere feel not-so-professional. As if this weren't bad enough, the interviewer actively led me down wrong paths at least twice (and I had to correct them, and explain why). I don't mean that they asked me about alternate approaches and why they were not valid. The interviewer actually suggested my solution was wrong and will not work for certain cases and I had to take a few minutes to help them understand the code even though I had already walked them through my approach before coding. Imo the interviewer was not well-trained and the shadower was silent throughout.

You get an array of customers and an array of discounts that can be used by each customer. Each customer can receive only maximum of three discounts. Highest paying customers should get the highest discounts, etc.