public void AllPossibleFBT_1()
        {
            var solution = new _0894_AllPossibleFullBinaryTrees();
            var result   = solution.AllPossibleFBT(2);

            Assert.AreEqual(0, result.Count);
        }
        public void AllPossibleFBT_3()
        {
            var solution = new _0894_AllPossibleFullBinaryTrees();
            var result   = solution.AllPossibleFBT(3);

            AssertHelper.AssertTrees(new List <int?[]> {
                new int?[] { 0, 0, 0 },
            }, result);
        }