Find the minimum value to be added so that array becomes balanced

Given an array of even size, task is to find minimum value that can be added to an element so that array become balanced. An array is balanced if the sum of the left half of the array elements is equal to the sum of right half. Suppose, we have an array 1 3 1 2 4 3. The Sum of first three elements is 1 + 3 + 1 = 5 and sum of last three elements is 2 + 4 + 3 = 9 
So this is unbalanced, to make it balanced the minimum number we can add is 4 to any element in first half.
Examples : 
 

Input : 1 2 1 2 1 3
Output : 2
Sum of first 3 elements is 1 + 2 + 1 = 4, 
sum of last three elements is 2 + 1 + 3 = 6
To make the array balanced you can add 2.

Find the minimum value to be added so that array becomes balanced: https://www.geeksforgeeks.org/find-the-minimum-value-to-be-added-so-that-array-becomes-balanced/