Package g0101_0200.s0144_binary_tree_preorder_traversal

Class Solution

java.lang.Object

g0101_0200.s0144_binary_tree_preorder_traversal.Solution

public class Solution
extends Object

144 - Binary Tree Preorder Traversal\. Easy Given the `root` of a binary tree, return _the preorder traversal of its nodes' values_. **Example 1:**  **Input:** root = [1,null,2,3] **Output:** [1,2,3] **Example 2:** **Input:** root = [] **Output:** [] **Example 3:** **Input:** root = [1] **Output:** [1] **Example 4:**  **Input:** root = [1,2] **Output:** [1,2] **Example 5:**  **Input:** root = [1,null,2] **Output:** [1,2] **Constraints:** * The number of nodes in the tree is in the range `[0, 100]`. * `-100 <= Node.val <= 100` **Follow up:** Recursive solution is trivial, could you do it iteratively?

Constructor Summary

Constructors

Constructor	Description
Solution()

Method Summary

Modifier and Type	Method	Description
List<Integer>	preorderTraversal(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

preorderTraversal

public List<Integer> preorderTraversal(TreeNode root)