Coding linked list
Reverse List / Reverse K-Group
LC 206, 25. Draw pointers. Helper that reverses k nodes and returns new head/tail.
Week 2Tuesday 20 OctoberLinked lists
Day 8: Linked lists
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Coding two pointers
Cycle + Intersection
LC 141, 160. Floyd. Prove why they meet, then find the entrance.
System design caching
Write-through vs write-back
Durability, latency, and what you lose on crash. Pick one for a session store.
System design caching
LRU vs LFU eviction
When frequency beats recency. Scan resistance. Cost of maintaining LFU.