7个字母,每个出现3次,共21个有重复的字母,每对2个,难道共21/2=10.5对?:)
7人每人打3场,想一下就得出0,无需编程。
本帖于 2012-06-08 15:13:42 时间, 由版主 idiot94 编辑
7个字母,每个出现3次,共21个有重复的字母,每对2个,难道共21/2=10.5对?:)
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