Description: There 1,2,3,4 numbers, how many can be composed of mutually exclusive with the three-digit numbers with no repetition
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有1、2、3、4个数字，能组成多少个互不相同且无重复数字的三位数\a.cpp
有1、2、3、4个数字，能组成多少个互不相同且无重复数字的三位数
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