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1. The app needs to send a notification to the user about driver status (asked, arrived, cancelled, or completed). Each notification must be processed asynchronously to avoid blocking other operations. Which architecture style fits best?
2. What are the differences between classes and IDs?
3. Suppose LeetCode will start its IPO soon. In order to sell a good price of its shares to venture capital companies, LeetCode would like to work on some projects to increase its capital before the IPO. Since it has limited resources, it can only complete at most k distinct projects before the IPO. Help LeetCode design the best way to maximize its total capital after completing at most k distinct projects. You are given several projects. For each project i, it has a required capital capitals[i] to start and after finishing, it will result in a profit profits[i]. Given k, w and two arrays capitals, profits, return the maximum total capital after completing at most k distinct projects. You can start a project only when you have at least the capital required for it. After finishing a project, you will gain its profit and the profit will be added to your total capital.
4. Given a scenario, which database would you choose?
5. What interests you in the digital world?
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