Linked List • Beginner • 15 min
Reverse Linked List
How to move away from rebuilding with an array and understand the core pointer idea in a [`linked list`](/glossary/linked-list).
Challenges · Linked List
Practice problems with walkthroughs, hints, and solutions.
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Linked List • Beginner • 18 min
Merge Two Sorted Lists
How to notice the lists are already sorted and that the right comparison always happens at the heads.
Linked List • Intermediate • 15 min
Linked List Cycle
How to detect a cycle with fast and slow pointers and understand why different speeds eventually meet.