It's basically asking if the array contains three consecutive numbers in which all three are within a range of two from one another. So, you don't want the difference between any of those three numbers to be greater than two. For example, 123 works, but 124 does not. Although 4 - 2 = 2 and 2 - 1 = 1, 4-1=3 which messes up the whole thing. This only needs to happen once in the array. It does not need to happen with every single group of 3. Also, a hint/solution from array123 might be slightly helpful with this problem.