LLD lru
LRU Cache — code + concurrency
Classes, lock granularity, and a test for eviction order. Not just LC 146.
Week 5Wednesday 7 OctoberLLD
Day 33: LLD core objects
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LLD parking lot
Parking Lot — tickets and fees
Spots, vehicle types, entry/exit, pricing strategy. Keep it to real classes.
Coding stack
Min Stack + Max Freq Stack
LC 155, 895. Freq stack: map of stacks. Speak the structure first.
System design
When LLD becomes HLD in the room
If they ask 'now 10M users', lift. Practice the pivot sentence.