My fast Javs solution


  • 0
    public TreeNode mergeTrees(TreeNode t1, TreeNode t2) {
        if (t1 != null) {
            if (t2 != null) {
                t1.val += t2.val;
                t1.left = mergeTrees(t1.left, t2.left);
                t1.right = mergeTrees(t1.right, t2.right);
            }
        } else {
            if (t2 != null) {
                return t2;
            }
        }
        return t1;
    }

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