Medium · Trees
Find Leaves of Binary Tree
Given the root of a binary tree, repeatedly remove all of its current leaves until the tree is empty, and return the values removed in each round as a list of lists, first round first; values within a round may be in any order, and an empty tree returns [].
Examples
Example 1
[1,2,3,4,5]Output: [4,5,3][2][1]
Example 2
[1,2,3,null,4]Output: [4,3][2][1]
Rebuild it in the studio
Read every interview problem free. Ten rooms need no account. A token opens a problem in full — Pro never counts.