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- W2952610984 abstract "M.Alekhnovich et al. recently have proposed a model of algorithms, called BT model, which covers Greedy, Backtrack and Simple Dynamic Programming methods and can be further divided into fixed, adaptive and fully adaptive three kinds, and have proved exponential time lower bounds of exact and approximation algorithms under adaptive BT model for Knapsack problem which are $Omega(2^{n/2}/sqrt n)=Omega(2^{0.5n}/sqrt n)$ and $Omega((1/epsilon)^{1/3.17})approxOmega((1/epsilon)^{0.315})$(for approximation ratio $1-epsilon$) respectively (M. Alekhovich, A. Borodin, J. Buresh-Oppenheim, R. Impagliazzo, A. Magen, and T. Pitassi, Toward a Model for Backtracking and Dynamic Programming, emph{Proceedings of Twentieth Annual IEEE Conference on Computational Complexity}, pp308-322, 2005). In this note, we slightly improved their lower bounds to $Omega(2^{(2-epsilon)n/3}/sqrt{n})approx Omega(2^{0.66n}/sqrt{n})$ and $Omega((1/epsilon)^{1/2.38})approxOmega((1/epsilon)^{0.420})$, and proposed as an open question what is the best achievable lower bounds for knapsack under adaptive BT models." @default.
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- W2952610984 date "2006-06-14" @default.
- W2952610984 modified "2023-09-26" @default.
- W2952610984 title "Improved Exponential Time Lower Bound of Knapsack Problem under BT model" @default.
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