3508. Implement Router | Leetcode Daily - Python
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Dive into LeetCode 3508: Implement Router, a fantastic system design problem that tests your data structure knowledge. We'll build a Router class to manage network packets with three core functions: adding packets, forwarding the oldest one (FIFO), and efficiently counting packets within a specific time range. The real challenge lies in optimizing the `getCount` method. We'll solve this by moving beyond a single data structure and using a powerful combination: a deque for FIFO order, a set for instant duplicate checks, and a dictionary of deques to group timestamps by destination. Discover how the problem's hint of 'increasing timestamps' unlocks the ability to use binary search (bisect_left and bisect_right in Python) for a lightning-fast O(log N) query time. This detailed explanation breaks down the logic, code, and time/space complexity, showing why choosing the right combination of tools is essential for efficient algorithm design.
Perfect for coding interview preparation and improving problem-solving skills.
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Solution Link:
https://leetcode.com/problems/impleme...
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