Today we're solving a problem which provides a nice introduction into the world of DFS tree traversals and has you performing some relatively straightforward operations as you pass through the tree.
A good problem for learning the ropes for DFS as this algorithm type is used constantly throughout Leetcode.
00:00 Intro
00:18 Question Prompt
00:40 Basic Example
01:45 Solution Intuition
04:08 Coding
07:11 Time/Space Complexity