有多个数组. 如何计算并获得有多少种组合?

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Release: 2016-06-13 11:37:00
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有多个数组. 怎么计算并获得有多少种组合??
数组A、B、C、D
里面的个数count不一定都相同。
组合顺序是固定的 A[rand] + B[rand] + C[rand] + D[rand] = 不重复字符串
怎么获取最大的组合数量、不重复字符串??

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