You are given an array arr[] of size n with duplicate elements, write a program to remove all duplicates from the array, and return the size of the new array.

Problem Notes

  • All elements of the resultant array must be unique.
  • It's better if the algorithm is in-place.

Example 1 

Input: arr[] = [-1, 0, 1, 1, 2, 9, 9]
Output: 5
Explanation: The new array will be [-1, 0, 1, 2, 9] i.e. having length 5.

Example 2 

Input: arr[] = [-10, 1, 3, 6, 6, 6, 6, 10]
Output: 5
Explanation: The new array will be [-10, 1, 3, 6, 10] having length 5 after removing repeated element 6.

Example 3 

Input: arr[] = [10, 20, 30, 33, 45]
Output: 5
Explanation: No elements were repeated

Example 4 

Input: arr[] = [1, 1, 1, 1, 1, 1]
Output: 1
Explanation: The only unique element was 1