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它只是 AN,其中 A 是字母表中的字符数(即 36),N 是输出字符串中的字符数。
如果你不能多次使用一个字符,那么它就是A! / (AN)! 其中 ! 是阶乘运算符。
A! / (AN)!
!
It's just AN, where A is the number of characters in your alphabet (i.e. 36) and N is the number of characters in your output string.
If you can't use a character more than once, then it is A! / (A-N)! where ! is the factorial operator.
A! / (A-N)!
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它只是 AN,其中 A 是字母表中的字符数(即 36),N 是输出字符串中的字符数。
如果你不能多次使用一个字符,那么它就是
A! / (AN)!
其中!
是阶乘运算符。It's just AN, where A is the number of characters in your alphabet (i.e. 36) and N is the number of characters in your output string.
If you can't use a character more than once, then it is
A! / (A-N)!
where!
is the factorial operator.