My JAVA Solution reuse t1


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

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