The notion of NP-completeness has provided a(66)mathematical definition for(67)intractability of NP problems. But this measure applies only to worst-case complexity. Being NP-complete does not(68)that a problem is intractable on the average case. Indeed,

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The notion of NP-completeness has provided a(66)mathematical definition for(67)intractability of NP problems. But this measure applies only to worst-case complexity. Being NP-complete does not(68)that a problem is intractable on the average case. Indeed, some NP-complete problems are "(69)on average", though some may not be. Levin initiated the study of average-case intractability, He showed that a bounded tiling problem under a simple distribution is average-case NP-complete. Since then, several additional average-case NP-complete problems have been shown within Levin's(70). This paper is intended to provide a comprehensive survey of average-case NP-complete problems that have been published so far, and the techniques of obtaining these results.

A.relaxed

B.rough

C.rigorous

D.feasible


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正确答案:C
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  • 第1题:

    66~67

    第 66 题 枳实导滞丸的君药是


    正确答案:A

  • 第2题:

    根据下列选项,回答 66~67 题。

    第 66 题 批准新药临床试验的部门是( )


    正确答案:A

  • 第3题:


    A.66J
    B.17J
    C.67J
    D.91J

    答案:C
    解析:

  • 第4题:

    回答 66~67 题:

    药物相互作用对药动学的影响

    第 66 题 影响分布( )。{Page}


    正确答案:E

  • 第5题:

    (66-67题共用题干)

    第66题:


    正确答案:E

  • 第6题:

    有67人参加的单淘汰比赛,比赛需要打多少轮多少场球?

    A.6轮66场球。

    B.6轮67场球。

    C.7轮66场球。

    D.7轮67场球。


    7 轮66场球。