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ans = (ans / i) * (i - 1); ans = ans * (i - 1) / i;的区别，就是AC与WA的区别，伤不起啊！ans = (ans / i) * (i - 1); ans = ans * (i - 1) / i;的区别，就是AC与WA的区别，伤不起啊！ Followed by:
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