Package g2201_2300.s2265_count_nodes_equal_to_average_of_subtree

Class Solution

java.lang.Object

g2201_2300.s2265_count_nodes_equal_to_average_of_subtree.Solution

public class Solution
extends Object

2265 - Count Nodes Equal to Average of Subtree.<p>Medium</p> <p>Given the <code>root</code> of a binary tree, return <em>the number of nodes where the value of the node is equal to the <strong>average</strong> of the values in its <strong>subtree</strong></em>.</p> <p><strong>Note:</strong></p> <ul> <li>The <strong>average</strong> of <code>n</code> elements is the <strong>sum</strong> of the <code>n</code> elements divided by <code>n</code> and <strong>rounded down</strong> to the nearest integer.</li> <li>A <strong>subtree</strong> of <code>root</code> is a tree consisting of <code>root</code> and all of its descendants.</li> </ul> <p><strong>Example 1:</strong></p> <p><img src="https://assets.leetcode.com/uploads/2022/03/15/image-20220315203925-1.png" alt="" /></p> <p><strong>Input:</strong> root = [4,8,5,0,1,null,6]</p> <p><strong>Output:</strong> 5</p> <p><strong>Explanation:</strong></p> <p>For the node with value 4: The average of its subtree is (4 + 8 + 5 + 0 + 1 + 6) / 6 = 24 / 6 = 4.</p> <p>For the node with value 5: The average of its subtree is (5 + 6) / 2 = 11 / 2 = 5.</p> <p>For the node with value 0: The average of its subtree is 0 / 1 = 0.</p> <p>For the node with value 1: The average of its subtree is 1 / 1 = 1.</p> <p>For the node with value 6: The average of its subtree is 6 / 1 = 6.</p> <p><strong>Example 2:</strong></p> <p><img src="https://assets.leetcode.com/uploads/2022/03/26/image-20220326133920-1.png" alt="" /></p> <p><strong>Input:</strong> root = [1]</p> <p><strong>Output:</strong> 1</p> <p><strong>Explanation:</strong> For the node with value 1: The average of its subtree is 1 / 1 = 1.</p> <p><strong>Constraints:</strong></p> <ul> <li>The number of nodes in the tree is in the range <code>[1, 1000]</code>.</li> <li><code>0 <= Node.val <= 1000</code></li> </ul>

Constructor Summary

Constructors

Constructor	Description
Solution()

Method Summary

Modifier and Type	Method	Description
int	averageOfSubtree(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

averageOfSubtree

public int averageOfSubtree(TreeNode root)