Maximum Sum Contiguous subarray with unique elements.

Given a non-empty array of length n with non-negative elements. Write a program to find and return the maximum sum of a contiguous

subarray of the given array such that no two elements are repeated in the subarray.


We will use two pointers i and j. We will use HashSet to store the elements of the ARRAY and update sum and j.

And once we encounter an element which is already in our set, we will remove all the elements from set preceding the repeated element, while incrementing i and updating our sum variable.



  • Time: O(n)
  • Auxiliary Space: O(n)