Reverse an array

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Problem statement

Given an array ar of n integers, reverse the elements of the array by using the concept of pointers.

Detailed explanation ( Input/output format, Notes, Images )
Input Format: 
Enter a number N and take N more inputs in array ar.
Output Format: 
Display values of the reversed array (separated by space)
Constraints 
1<= n <=10^6
-10^6<= ar[i] <= 10^6
Note 
 You only have to complete the definition of the given function named "reverse". Input has already been taken for you.
Sample Input :
4
1
2
3
4
Sample Output :
4 3 2 1
Reverse an array
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