单项选择题

Assume that N=2M and FIFO is used. If the string p1,p2,...,pN is repeated three times, then the number of page faults is

A．

N/2

B．

N 2N

C．

2N

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单项选择题

设有关系R(A,B,C)，在下列的等式中，不成立的是

A．σ_A＜2(π_A，B()=π _A,B(σ_A＜2(
B．π_A,C(σ_A＜2( =σ_A＜2(π_A,C()
C．π_B,C(σ_A＜2( =σ_A＜2(π_B,C()
D．π_A(Л_A,B()=π _A(

单项选择题

Suppose elements in array A are already sorted ascending order of their values when the code begins to run, then execution time of the code will be

A．O(log₂
B．O(
C．O(nlog₂
D．O(n²)

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