LeetCode — Binary Tree Pruning
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 plus every node that is a descendant of
Input: root = [1,null,0,0,1]
Only the red nodes satisfy the property "every subtree not containing a 1".
The diagram on the right represents the answer.
Input: root = [1,0,1,0,0,0,1]
Input: root = [1,1,0,1,1,0,1,0]
- The number of nodes in the tree is in the range