Easy:

Medium:

Eight Queens
- This challenge only asks you to determine if there is any attack, which is much simpler than to find solutions that no queen attacking each other as described in wikiedia.

Kaprekars Constant
Chessboard Traveling
- It's all about permutation.
Maximal Square
- I think this one is very hard when it comes to matrix and filter, and how to handle filter movement within a matrix by pure code without using some matrix handling library.
- Since coderbyte uses python2, and my own laptop uses python3, I have 2 versions of the code.
- For python2 version, you can just copy and paste the code on to the coderbyte online editor and test the code.
- For python3, you can run it on your own computer. You need to copy and paste the test case on strArr, for example: strArr = ["0111", "1111", "1111", "1111"]
- You can uncomment the print() to have a close monitor on how it works. Have fun!
Pentagonal Number
- Although it is a hard challenge, it is not hard at all. All you need to do is to find the regular pattern of how the pentagon grows.