Challenge me, Thx

  • -1

    public TreeNode mergeTrees(TreeNode t1, TreeNode t2) {
    if(t1 == null && t2 == null) return null;
    if(t1 == null) return t2;
    if(t2 == null) return t1;
    t1.val += t2.val;
    t1.left = mergeTrees(t1.left, t2.left);
    t1.right = mergeTrees(t1.right, t2.right);
    return root;

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