4653：k-th point

Special Judge 特殊评判

题目描述

Consider n data points uniformly distributed in a p-dimensional unit ball centered at the origin. What is the expected distance of the k-th farthest point? (Here k start from 0 to n-1, and 0-th is the farthest point, (n-1)-th is the nearest point.)

输入解释

The first line contains a number T(T≤100), which is the number of the case number. The next T lines, each line contains a number p, n and k(1≤p, n≤10⁴,0≤k≤n-1) you need to consider.

输出解释

For each p, n and k, output the expected distance in a single line.The answer will be considered correct if the absolute or relative error doesn't exceed 10-4.

输入样例

输出样例

0.666666667
0.800000000
0.857142857
0.642857143
0.812559023

来自杭电HDUOJ的附加信息

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该题目是Virtual Judge题目，来自杭电HDUOJ

题目来源 2013 Multi-University Training Contest 5

源链接： HDU-4653

最后修改于 2020-10-25T23:15:31+00:00 由爬虫自动更新

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通过率 --%

时间上限	内存上限
2000/1000MS(Java/Others)	32768/32768K(Java/Others)