Space-Efficient Las Vegas Algorithms for K-SUM

Using hashing techniques, this paper develops a family of space-efficient Las Vegas randomized algorithms for $k$-SUM problems. This family includes an algorithm that can solve 3-SUM in $O(n^2)$ time and $O(\sqrt{n})$ space. It also establishes a new time-space upper bound for SUBSET-SUM, which can be solved by a Las Vegas algorithm in $O^*(2^{(1-\sqrt{\8/9\beta})n})$ time and $O^*(2^{\beta n})$ space, for any $\beta \in [0, \9/32]$.