Pro vs. Hard Coding Interview Problem - LRU Cache (LeetCode Day 24)

LRU Cache is about removing the element that was accessed longest time ago. It's a hard problem and it took me 15 minutes to get any solution, then another 20+ to solve it in the best way. This is the closest you will see to me struggling during a coding interview.
Leetcode 30-day April Challenge: https://leetcode.com/explore/featured...

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