Use fast and slow pointers to show the middle value.
Acceptance criteria
- 1.#out should show middle 3.
DSA Tutorial · Linked Lists
Practice: Linked List Two Pointer Problems
These 10 tasks go with the Linked List Two Pointer Problems chapter. 5 of them ask you to build something small from scratch; 5 give you code that is already broken and ask you to work out why. Set aside about 90 minutes for the whole set, though you can do them in any order.
Nothing here is marked by a person. When you press Submit, the editor checks your code against the points listed under each task and tells you straight away what passed and what didn't (you need a free account to submit). If you get stuck, there are hints, and a worked solution once you've had a go. The first 2 tasks are free; the rest are part of the practice plan.
If it's been a while since you read the chapter, here is how it starts: “You cannot index into a linked list, so every question about position is answered with two pointers moving at different speeds. Learn the three shapes and you have covered most of what gets asked.” .