I've posted a few blogs since early December 2023. I'll define the difficulty level of the blogs with the below scale.

The difficulty level of my blogs are as follows:

Easy — solved within 1.5 hours

Medium — solved within 2~4 hours

Hard — not solved and peeked at the solution

Sleep — completely out my skill range, I just gave up

Note that these are my personal opinions on the problems' difficulty. It differs from person to person.