Let’s say you have a list of integer values that represent the days of a month like this: 6, 2, 4, 1, 9, 7, 3, 10, 13, 15, 19, 11, 18, 13, 22, 24, 20, 27, 31, 25, 28 - Clearly we have missing numbers/days in the list. They are: 5 8 12 14 16 17 21 23 26 29 30. It’s really easy to get a list of missin...