首页 > 代码库 > LeetCode Binary Tree Postorder Traversal

LeetCode Binary Tree Postorder Traversal

Given a binary tree, return the postorder traversal of its nodes‘ values.

For example:
Given binary tree {1,#,2,3},

   1         2    /   3

 

return [3,2,1].

 

 1 /** 2  * Definition for binary tree 3  * public class TreeNode { 4  *     int val; 5  *     TreeNode left; 6  *     TreeNode right; 7  *     TreeNode(int x) { val = x; } 8  * } 9  */10 public class Solution {11     List<Integer> list = new ArrayList<Integer>();12     public List<Integer> postorderTraversal(TreeNode root) {13             if (root==null) {14                 return list;15             }16             TreeNode letfTree = root.left;17             if (letfTree!=null) {18                 postorderTraversal(letfTree);19             }20             TreeNode rightTree = root.right;21             if (rightTree!=null) {22                 postorderTraversal(rightTree);23             }24             list.add(root.val);25             return list;26            27        }28 }

 

LeetCode Binary Tree Postorder Traversal