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在长度为n的数组a[n]中(下标从0开始)存储两个栈时,假设左栈的栈顶指针(下标)是topl,右栈的栈顶指针是topr,那么数据元素x进左栈的topl操作是(),右栈的退栈topr操作是()。

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设有输入序列(2,3,1,5,4),借助辅助栈或辅助队列得到序列(1,2,3,4,5),问最少需要( )个辅助栈,或最少需要()个辅助队列。

What are the obvious missing pieces during the outbreak of Ebola.

A. No group of epidemiologists ready to go.
B. No medical team ready to go.
C. No soldiers ready to go.
D. No one to look at treatment approaches and diagnostics.

If anything kills over 10 million people in the next few decades, it's most likely to be a highly infectious rather than a war. Not missiles, but .

What are the key pieces we need to deal with an epidemic?

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