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package g0901_1000.s0965_univalued_binary_tree;
// #Easy #Depth_First_Search #Breadth_First_Search #Tree #Binary_Tree
// #2022_03_31_Time_1_ms_(17.57%)_Space_42.1_MB_(20.22%)
import com_github_leetcode.TreeNode;
import java.util.LinkedList;
/*
* Definition for a binary tree node.
* public class TreeNode {
* int val;
* TreeNode left;
* TreeNode right;
* TreeNode() {}
* TreeNode(int val) { this.val = val; }
* TreeNode(int val, TreeNode left, TreeNode right) {
* this.val = val;
* this.left = left;
* this.right = right;
* }
* }
*/
public class Solution {
public boolean isUnivalTree(TreeNode root) {
int val = root.val;
LinkedList queue = new LinkedList<>();
queue.add(root);
while (!queue.isEmpty()) {
TreeNode node = queue.poll();
if (node.val != val) {
return false;
}
if (node.left != null) {
queue.add(node.left);
}
if (node.right != null) {
queue.add(node.right);
}
}
return true;
}
}