Practice Binary Tree Pruning
Read the task, work through the examples, and check your approach against the constraints. Use the original LeetCode task for coding and submissions.
Problem Statement
Given the root of a binary tree, return the same tree where every subtree (of the given tree) not containing a 1 has been removed. A subtree of a node node is node plus every node that is a descendant of node.
Source: Binary Tree Pruning on LeetCode. Use the original task for its coding environment and submissions.
Examples
# Example 1
Input
root = [1,null,0,0,1]
Output
[1,null,0,null,1]
# Example 2
Input
root = [1,0,1,0,0,0,1]
Output
[1,null,1,null,1]
# Example 3
Input
root = [1,1,0,1,1,0,1,0]
Output
[1,1,0,1,1,null,1]
Constraints
The number of nodes in the tree is in the range [1, 200].
Node.val is either 0 or 1.
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