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输入两个整数序列,第一个序列表示栈的压入顺序,请判断第二个序列是否为该栈的弹出顺序。假设压入栈的所有数字均不相等。例如序列1,2,3,4,5是某栈的压入顺序,序列4,5,3,2,1是该压栈序列对应的一个弹出序列,但4,3,5,1,2就不可能是该压栈序列的弹出序列。(注意:这两个序列的长度是相等的) ...
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wen_da
经典指数
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There is a sequence of n numbers 1, 2, 3,.., n and a stack which
can keep m numbers at most. Push the n numbers into the stack
following the sequence and pop out randomly. Suppose n is 2 and m is
3, the output sequence may be 1, 2 or 2, 1, so we get 2 different
sequences. Suppose n is 7 and m is 5, please choose the output
sequences of the stack:
1, 2, 3, 4, 5, 6, 7
7, 6, 5, 4, 3, 2, 1
5, 6, 4, 3, 7, 2, 1
5, 6, 4, 3, 7, 2, 1
1, 7, 6, 5, 4, 3, 2
3, 2, 1, 7, 6,5, 4 ...
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经典指数
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