Week 6

This week, i learnt about a new structure, tree. Honestly, i don't really understand why we should use this kind of nested structure which must be so annoyed when we try to understand the data it stored. The work on in-order, pre-order and post-order quite confused me at the beginning, but after the TA draw a picture and explained by steps, i can nicely know how it works and i can even try to write my on in-order functions.