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Schroeppel-Shamir algorithm

Also called Schroeppel-Shamir, split-and-list subset sum.

Subset sum in O(2^(n/2)) time with only O(2^(n/4)) memory, using heaps to generate the sums in order.

Subset sum in O(2^(n/2)) time with only O(2^(n/4)) memory, using heaps to generate the sums in order.

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