public void ArrayAlgorithms_FindNonRepeatedElementsUsingMap_No_Missing_Elements_Should_Return_Minus_1()
        {
            // Arrange
            var input = new int[] { 1, 7, 2, 6, 2, 7, 6, 1 };

            // Act
            var output = ArrayAlgorithms.FindNonRepeatedElementUsingMap(input);

            // Assert

            Assert.AreEqual(-1, output);
        }