g0801_0900.s0814_binary_tree_pruning

Class Solution

java.lang.Object

g0801_0900.s0814_binary_tree_pruning.Solution

public class Solution
extends Object

814 - Binary Tree Pruning.

Medium

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.

Example 1:

Input: root = [1,null,0,0,1]

Output: [1,null,0,null,1]

Explanation: Only the red nodes satisfy the property “every subtree not containing a 1”. The diagram on the right represents the answer.

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.

Constructor Summary

Constructors

Constructor and Description
Solution()

Method Summary

Modifier and Type	Method and Description
TreeNode	pruneTree(TreeNode root)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

Solution

public Solution()

Method Detail

pruneTree

public TreeNode pruneTree(TreeNode root)