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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
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