时间序列分析是统计学的分支之一，它的研究对象是离散有序数列的变化特征和变化趋势。

As one of the branches of statistics, time series analysis focuses on the variation characters and trend of discrete ordered data series mainly.

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北佛罗里达大学的研究人员对72名年龄在18-59岁之间的男女进行了研究，他们让这些调查对象记住若干写满倒序数字的数列，从而测定他们的工作记忆力。

The University of North Florida researchers put 72 men and women aged between 18 and 59 through a test of working memory, in which they had to remember lists of numbers in reverse order.

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还有一种方法是求数列的逆序数，因为根据题目所给条件，逆序数就是交换次数，代码一并贴出。

Then print a single line containing the minimal number of swaps of adjacent numbers that are necessary to sort the given sequence. Terminate the output for the scenario with a blank line.

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还有一种方法是求数列的逆序数，因为根据题目所给条件，逆序数就是交换次数，代码一并贴出。

Then print a single line containing the minimal number of swaps of adjacent numbers that are necessary to sort the given sequence. Terminate the output for the scenario with a blank line.

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