@@ -0,0 +1,269 @@
+package dtprogrammer.github.io.common;%0A%0A/**%0A * Leetcode TreeNode class for testing and dedbugging%0A */%0Apublic class TreeNode %7B%0A    public final int val;%0A    public TreeNode left;%0A    public TreeNode right;%0A%0A    public TreeNode(int val) %7B%0A        this.val = val;%0A    %7D%0A%7D%0A

Add TreeNode class