Array Equilibrium Index

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Find and return the equilibrium index of an array. Equilibrium index of an array is an index i such that the sum of elements at indices less than i is equal to the sum of elements at indices greater than i.

Element at index i is not included in either part.

If more than one equilibrium index is present, you need to return the first one. And return -1 if no equilibrium index is present.

Input format :
Line 1 : Size of input array
Line 2 : Array elements (separated by space)
Constraints:
Time Limit: 1 second
Size of input array lies in the range: [1, 1000000]
Sample Input :
7
-7 1 5 2 -4 3 0
Sample Output :
3

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