DIY: Split Array into Consecutive Subsequences

Problem statement

Given an array sorted in ascending order, determine if it’s possible to split the array into one or more subsequences such that each subsequence consists of consecutive integers and has a length of at least 3 integers.

Input

The input will be a list of sorted numbers. The following is an example input:

[1, 2, 3, 3, 4, 4, 5, 5]

Output

The output should show whether the numbers can make consecutive subsequences of a length 3 or more. For the above input, the output should be:

true

Coding exercise

For this coding exercise, you need to implement the is_possible(arr) function, where arr is the sorted list of numbers. The function should return either true or false depending on whether the consecutive subsequences exist or not.