Write a program that takes an array/arraylist of integer and finds longest sub array/arraylist whose entries are equal [closed]

About your code, sorting (Collections.sort(arr);) will totally prevent you from finding the solution.

I’ll help in pseudocode

Given a counter c
A max counter m
A variable for the max element, e
And an array a
For every element in the array a
    If the element matches the previous element
        increment the count c, and:
          if the count c > m:
            set m to c, and e to the current value
    If it doesn't match the previous, reset the count to 1

Then after all this, the result is e, c times

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