**Problem 9: Unique Elements**

**Problem Description**

You are given an array **A** of **N** elements. You have to make all elements unique, to do so in one step you can increase any number by one.

Find the minimum number of steps.

**Problem Constraints**

1 <= N <= 105

1 <= A[i] <= 109

**Input Format**

The only argument given is an Array A, having N integers.

**Output Format**

Return the Minimum number of steps required to make all elements unique.

**Example Input**

Input 1:

A = [1, 1, 3]

Input 2:

A = [2, 4, 5]

**Example Output**

Output 1:

1

Output 2:

0

**Example Explanation**

Explanation 1:

We can increase the value of 1st element by 1 in 1 step and will get all unique elements. i.e [2, 1, 3].

Explanation 2:

All elements are distinct.

Note: You only need to implement the given function. Do not read input, instead use the arguments to the function. Do not print the output, instead return values as specified. Still have a doubt?

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