Invert Binary Tree - Leetcode 226 - Python - Depth First Search

0:00 - Read the problem 0:40 - Solution 2:20 - Coding solution 4:20 - How to remember Problem link: https://leetcode.com/problems/invert-binary-tree/ leetcode 226 This question was identified as a google interview question from here: https://github.com/xizhengszhang/Leetcode_company_frequency/blob/master/Apple%20-%20LeetCode.pdf