Computational complexity;
Knapsack problem;
Subset-sum;
Exponential-time hypothesis;
PRAM without bit operations;
Algebraic-circuit lower-bounds;
Hardness of approximation;
D O I:
暂无
中图分类号:
学科分类号:
摘要:
We show various hardness results for knapsack and related problems; in particular we will show that unless the Exponential-Time Hypothesis is false, subset-sum cannot be approximated any better than with an FPTAS. We also provide new unconditional lower bounds for approximating knapsack in Ketan Mulmuley’s parallel PRAM model. Furthermore, we give a simple new algorithm for approximating knapsack and subset-sum, that can be adapted to work for small space, or in small parallel time.