988. Smallest String Starting From Leaf - notruilin/LeetCode GitHub Wiki

1. Convert int to ASCII in Python

num = ord('a')
char = chr('num')

2. Reverse a string (String to List to String)

"".join(reversed(word))

3. Change primitive type (e.g. String) variables passed into function won't change the original values. Non-primitive (e.g. List) variables are pointers, change value of pointers will affect everywhere referenced to them