Big-O Intuition
Reason about how work grows with input size.
Lesson 2
Concept
Constant, linear, log, and quadratic patterns cover most beginner code. Favor linear passes; beware nested loops over large data.
Try it
Order from fastest to slowest (as n grows)
These steps are out of order — can you fix them?
1.O(n log n)
2.O(1)
3.O(n^2)
4.O(n)