mediumNeetCode 150
Count Good Nodes in Binary Tree
Return the number of good nodes in the binary tree Example: [3,1,4,3,null,1,5] => 4
Count Good Nodes in Binary Tree is a traversal problem: the hard part is modeling the state you visit. Interviewers love it because it reveals your traversal modeling and your edge-case discipline. Once your traversal structure is solid, you can reuse it across dozens of problems.
Meet Coco
Coco is an AI study partner, not a person. She listens while you explain your code, asks what a line does and never hands you the fix. Sign in free to type with Coco, up to a daily limit, and to talk with her for one hour. After that, talking comes with the $79 pack. Anyone can open the editor and run their code.
1Count Good Nodes in Binary Treemedium