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You are given an array **Arr **of size **N**. Replace every element with the **next greatest element** (greatest element on its right side) in the array. Also, since there is no element next to the last element, replace it with **-1**.

**Example 1:**

**Input:
**N = 6
Arr[] = {16, 17, 4, 3, 5, 2}
**Output:**
17 5 5 5 2 -1
**Explanation:** For 16 the greatest element
on its right is 17. For 17 it's 5.
For 4 it's 5. For 3 it's 5. For 5 it's 2.
For 2 it's -1(no element to its right).
So the answer is 17 5 5 5 2 -1

**Example 2:**

**Input:
**N = 4
Arr[] = {2, 3, 1, 9}
**Output:**
9 9 9 -1
**Explanation: **For each element except 9 the
greatest element on its right is 9.
So the answer is 9 9 9 -1

**Your Task: **

You don't need to read input or print anything. Your task is to complete the function **nextGreatest()** which takes the array of integers **arr **and **n**** **as parameters and returns void. You need to change the array itself.

**Expected Time Complexity:** O(N)

**Expected Auxiliary Space:** O(1)

**Constraints:**

1 <= N <= 10^{5}

1 <= Arr_{i} <= 10^{6}

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Greater on right side

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