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[算法]排列组合的算法

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Release： 2016-06-13 12:10:17
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[算法求助]求一个排列组合的算法
是这样的
从0~9,a~z这36个字符中随机抽取3个数，计算有多少种排列组合的方法
求大神指教
------解决思路----------------------
对 
从2个数里提出两个数来 组合 就是 1
排列 才是 2
p(n,m)=n(n-1)(n-2)……(n-m+1)=n!/(n-m)!(规定0!=1).

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