Given a vector x, return the indices to elements that will sum to exactly half of the sum of all elements.
Example:
Input x = [1 2 3 4 5 6 7] Output xi = [1 6 7]
because
sum(x) = 28 sum(x([1 6 7])) = 14
The answer is not necessarily unique and the order is unimportant. We will just test to make sure that sum(x)/2 is sum(x(xi))
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