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Postorder recursive
package com.interviewbytes.trees;
import java.util.ArrayList;
import java.util.List;
public class PostorderRecursive {
public List<Integer> postorderTraversal(TreeNode root) {
List<Integer> list = new ArrayList<>();
helper(root, list);
return list;
}
private void helper(TreeNode node, List<Integer> list) {
if (node == null) return;
helper(node.left, list);
helper(node.right, list);
list.add(node.val);
}
}
package com.interviewbytes.trees;
public class TreeNode {
int val;
TreeNode left;
TreeNode right;
TreeNode(int x) {
val = x;
}
}
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