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Your swim school has two swimming instructors, Jeff and Anna. Their current schedules are shown below. An “X” denotes a 1-hour time slot that is occupied with a lesson.
Write a program with array(s) capable of storing the schedules. Create a main menu that allows the user to mark a time slot as busy or free for either instructor. Also, add an option to output the schedules to the screen. Next, add an option to output all time slots available for individual lessons (slots when at least one instructor is free). Finally, add an option to output all time slots available for group lessons (when both instructors are free).
18. Modify
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