题目内容

For every $r>1$, $r^n=$_____.

A. $O(n^2)$
B. $\Omega(\sqrt n)$
C. $\Theta(n^r)$

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$f(n) = n^3 + 2n^2 + 1$ is _____.

A. $\Omega (n^4)$
B. $O (n^2)$
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If $NP\neq co-NP$, then $P \neq NP$.

Decide whether you think the following statement is true or false.$G\ $ is a flow network with a maximum flow which has a value of $v(f)$. Consider the flow network $G'$ obtained by adding $1$ to the capacity of every edge. The value of the maximum flow in $G'$ is $v(f) + 1\ $.

A. 正确
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We have a function $f(x)=2x^2-9x+3$. We want to get the minimize value of $f$ and define neighbors of $x$ are $x-1$ and $x+1$. We start at $x = 0$. The algorithm finds a local optimum at $x$ =_____.

A. 1
B. 2
C. 3
D. 4