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Linked List

Pointer manipulation, reversal, and cycle detection

3 Easy2 Medium1 Hard

All Problems

#	Problem	Pattern	Difficulty
206	Reverse Linked List	Iterative Reversal	Easy
21	Merge Two Sorted Lists	Two Pointer Merge	Easy
141	Linked List Cycle	Fast/Slow Pointers	Easy
143	Reorder List	Find Mid + Reverse + Merge	Medium
146	LRU Cache	Hash Map + Doubly Linked List	Medium
23	Merge K Sorted Lists	Divide and Conquer / Heap	Hard