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Main.java
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Main.java
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package com.company;
import java.util.ArrayList;
import java.util.List;
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 Main {
public static void main(String[] args) {
// write your code here
}
public List<Integer> postorderTraversal(TreeNode root) {
List<Integer> res = new ArrayList<>();
dfs(root, res);
return res;
}
public void dfs(TreeNode node, List<Integer> res){
if (node == null) return;
dfs(node.left, res);
dfs(node.right, res);
res.add(node.val);
}
}