public void Ex7Test()
        {
            int[] inputArray = { 1, 2, 2 };

            TripleInteger[] expectedResult = new TripleInteger[2];
            expectedResult[0] = new TripleInteger(1, 1, 1);
            expectedResult[1] = new TripleInteger(2, 4, 2);

            ExercisesPart1 exercises = new ExercisesPart1();

            TripleInteger[] actualResult = exercises.Ex7(inputArray);

            for (int i = 0; i < 2; i++)
            {
                Assert.AreEqual(actualResult[i].FirstValue, expectedResult[i].FirstValue);
                Assert.AreEqual(actualResult[i].SecondValue, expectedResult[i].SecondValue);
                Assert.AreEqual(actualResult[i].ThirdValue, expectedResult[i].ThirdValue);
            }
        }
        public TripleInteger[] Ex7(int[] inputArray)
        {
            var quert =
                from value in inputArray
                group value by value into frequency
                select frequency;

            TripleInteger[] resultArray = new TripleInteger[quert.Count()];

            int counter = 0;

            foreach (var quertResult in quert)
            {
                resultArray[counter] = new TripleInteger(
                    quertResult.Key,
                    quertResult.Key * quertResult.Count(),
                    quertResult.Count()
                    );
                counter++;
            }

            return(resultArray);
        }