NPC问题的有效程序应该是长度上界的,并通过机器枚举的方法进行了思想实验
Efficient programs of NPC problems should be length upper-bounded, and a thought experiment to search for them by machine enumeration
摘要:
本文提出了一个用机器枚举方法寻找NPC问题有效有界算法的思想实验。主要贡献包括:--在通用图灵机上,程序的时间复杂度应表征为:执行时间(n)=加载时间(n)+运行时间(n)。--引入有界算法的概念,提出了一种基于比较的判定有界算法是否无效的标准,并建立了有效有界程序的长度上界。--引入增长率特征函数来评估程序复杂性,更容易基于观察值进行机器检查。--提出了一个理论问题:对于NPC问题,是否存在多项式执行时间的有界算法。
英文摘要:
This paper proposes a thought experiment to search for efficient bounded algorithms of NPC problems by machine enumeration. The key contributions are: -- On Universal Turing Machines, a program's time complexity should be characterized as: execution time(n) = loading time(n) + running time(n). -- Introduces the concept of bounded algorithms; proposes a comparison based criterion to decide if a bounded algorithm is inefficient; and establishes the length upper bound of efficient bounded programs. -- Introduces the growth rate characteristic function to evaluate program complexity, which is more easily machine checkable based on observations. -- Raises the theoretical question: if there exists any bounded algorithm with polynomial execution time for NPC problems.
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