Google2015校招笔试 Round B



Google2015校招笔试 Round B

问由N个不同字符组成的长度为M的密码串有多少个？ 其中对每个密码串所有的N个不同字符都必须出现过.

  • 答案1 Brute Force

下面方程的每一组解作全排列之后的所有计数累加，就是答案。假设有一组解为X1,…,Xn,那么该组解的排列之后有 M!/(X1! * X2! * … * Xn!)，所有解累加即答案。


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