(SENIOR) The Math question

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Piyush has array a, consisting of n integers a0,a1a2,an-1, and function f(x), taking an integer from 0 to 2n-1 as its single argument. Value f(x) is calculated by formula , where bit(i) equals one if the binary representation of number x contains a 1 on the ith position, and zero otherwise. For example, if n=4 and x=11 (11=20 + 21 + 23), then f(x)= a0 + a1 + a3. Help Piyush find the miximum of

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solution.cppC++17

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