Remove Duplicates Problem Statement

You are given an array of integers. The task is to remove all duplicate elements and return the array while maintaining the order in which the elements were provided.

Example:

Input:

T = 2 N = 5 arr = [1, 2, 2, 3, 1] N = 4 arr = [4, 5, 5, 4]

Output:

[1, 2, 3] [4, 5]

Explanation:

In the first test case, the output removes duplicates while preserving order, resulting in [1, 2, 3]. In the second test case, the output is [4, 5].

Constraints:

• 1 ≤ T ≤ 10
• 1 ≤ N ≤ 5*103
• -105 ≤ arr[i] ≤ 105
• Time Limit: 1 sec