## Question

Devise an algorithm to decide whether a list of integers can be divided into two smaller lists of equal sum. For instance,

[1, 1, 1,2, 2, 2, 3,3, 4, 5,16]can be fairly divided into [1, 1, 1, 2, 2, 2, 3, 3, 5] and [4, 16].

However,[4, 4, 8, 10,14]cannot be fairly divided.

## Solution Preview

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The solving idea is quite straightforward: if the sum of all elements of the array is odd, then we canâ€™t divide the array into two subsets with equal sum; so a necessary condition is to have an even sum.

Then we can recursively try to solve the calculation of a subset with elements that sum to S/2, where S is the sum of all elements of the array. This can be achieved by trying at each step if we can include or not the last element into the target sum....

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