Biggest Number From Digits

There is an array, named digits, consisting of N digits. Choose at most three digits (not necessarily adjacent) and merge them into a new integer without changing the order of the digits. What is the biggest number that can be obtained this way?

Write a function: googleBiggestNumberOfDigits(int[] arr) that, given an array of N digits, returns the biggest number that can be built.

Assume that:

• N is an integer within the range [3..50];
• each element of array, named 'digits', is an integer within the range [0..9].

In your solution, focus on correctness. The performance of your solution will not be the focus of the assessment.