public void FindNumberOfStudentsDoingHomeworkAtAGivenTime()
        {
            int[] startTime = new int[3] {
                1, 2, 3
            };
            int[] endTime = new int[3] {
                3, 2, 7
            };
            int queryTime = 4;

            Assert.AreEqual(1, P1450NumberOfStudentsDoingHomeworkAtAGivenTime.BusyStudent(startTime, endTime, queryTime));

            startTime = new int[1] {
                4
            };
            endTime = new int[1] {
                4
            };
            queryTime = 4;

            Assert.AreEqual(1, P1450NumberOfStudentsDoingHomeworkAtAGivenTime.BusyStudent(startTime, endTime, queryTime));

            startTime = new int[9] {
                9, 8, 7, 6, 5, 4, 3, 2, 1
            };
            endTime = new int[9] {
                10, 10, 10, 10, 10, 10, 10, 10, 10
            };
            queryTime = 5;

            Assert.AreEqual(5, P1450NumberOfStudentsDoingHomeworkAtAGivenTime.BusyStudent(startTime, endTime, queryTime));
        }
        public void NoStudentsDoingHomeworkAtAGivenTime()
        {
            int[] startTime = new int[1] {
                4
            };
            int[] endTime = new int[1] {
                4
            };
            int queryTime = 5;

            Assert.AreEqual(0, P1450NumberOfStudentsDoingHomeworkAtAGivenTime.BusyStudent(startTime, endTime, queryTime));
        }