Get most used byte array in a byte array in c#?

Question

How can I get the most used byte array from another bytearray? Is there is simple way to do this?

So for example:

the input byte array: 41, 4, 5, 42,4,5,42,4,5,42,2

And then the return: 4, 5, 42

Thanks in advance.

Answer 1

var grouped = prod.ToLookup(x => x);
var maxRepetitions = grouped.Max(x => x.Count());
var allItemsWithEqualMax = grouped.Where(x => x.Count() == maxRepetitions)
                                  .Select(x => x.Key).ToList(); 

Creds: https://stackoverflow.com/a/15184669/496680