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Given an array A your task is to tell at which position the equilibrium first occurs in the array. Equilibrium position in an array is a position such that the sum of elements below it is equal to the sum of elements after it.
The first line of input contains an integer T denoting the no of test cases then T test cases follow. First line of each test case contains an integer N denoting the size of the array. Then in the next line are N space separated values of the array A.
For each test case in a new line print the position at which the elements are at equilibrium if no equilibrium point exists print -1.
1 3 5 2 2
1. Since its the only element hence its the only equilibrium point
2. For second test case equilibrium point is at position 3 as elements below it (1+3) = elements after it (2+2)