The interview was decent until they gave the programming question. The programming question was very hard. It was the hardest that I've ever gotten. I still don't know how to solve it. ChatGPT gives some ideas; maybe I will check them sometime, but I certainly couldn't solve it during a 1-hour interview.

You have paid processes that can execute tasks with time[i] and cost[i]. You have free processes that can run only when paid processes run and can execute any task in 1 unit time with 0 cost.

How do you execute the tasks with the least cost?