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
第1题:
66~67
第 66 题 枳实导滞丸的君药是
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( )
第3题:
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}
第5题:
(66-67题共用题干)
第66题:
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。