public void LargestUniqueNumber_1()
        {
            var solution = new _1133_LargestUniqueNumber();
            var result   = solution.LargestUniqueNumber(new int[] { 5, 7, 3, 9, 4, 9, 8, 3, 1 });

            Assert.AreEqual(8, result);
        }
        public void LargestUniqueNumber_2()
        {
            var solution = new _1133_LargestUniqueNumber();
            var result   = solution.LargestUniqueNumber(new int[] { 9, 9, 8, 8 });

            Assert.AreEqual(-1, result);
        }