Package 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.<p>Medium</p> <p>Given the <code>root</code> of a binary tree, return <em>the same tree where every subtree (of the given tree) not containing a</em> <code>1</code> <em>has been removed</em>.</p> <p>A subtree of a node <code>node</code> is <code>node</code> plus every node that is a descendant of <code>node</code>.</p> <p><strong>Example 1:</strong></p> <p><img src="https://s3-lc-upload.s3.amazonaws.com/uploads/2018/04/06/1028_2.png" alt="" /></p> <p><strong>Input:</strong> root = [1,null,0,0,1]</p> <p><strong>Output:</strong> [1,null,0,null,1]</p> <p><strong>Explanation:</strong> Only the red nodes satisfy the property &ldquo;every subtree not containing a 1&rdquo;. The diagram on the right represents the answer.</p> <p><strong>Example 2:</strong></p> <p><img src="https://s3-lc-upload.s3.amazonaws.com/uploads/2018/04/06/1028_1.png" alt="" /></p> <p><strong>Input:</strong> root = [1,0,1,0,0,0,1]</p> <p><strong>Output:</strong> [1,null,1,null,1]</p> <p><strong>Example 3:</strong></p> <p><img src="https://s3-lc-upload.s3.amazonaws.com/uploads/2018/04/05/1028.png" alt="" /></p> <p><strong>Input:</strong> root = [1,1,0,1,1,0,1,0]</p> <p><strong>Output:</strong> [1,1,0,1,1,null,1]</p> <p><strong>Constraints:</strong></p> <ul> <li>The number of nodes in the tree is in the range <code>[1, 200]</code>.</li> <li><code>Node.val</code> is either <code>0</code> or <code>1</code>.</li> </ul>

Constructor Summary

Constructors

Constructor	Description
Solution()

Method Summary

Modifier and Type	Method	Description
TreeNode	pruneTree(TreeNode root)

Methods inherited from class java.lang.Object

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

Constructor Details

Solution

public Solution()

Method Details

pruneTree

public TreeNode pruneTree(TreeNode root)