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我实在是搞不懂 (i+12)%13 +1 与 (i-1)%13 +1 有什么区别

Posted by zzyynn at 2010-11-26 15:21:04 on Problem 1008
当然 i>0
(i-1) % 13 +1 时 WA
(i+12) % 13 +1 时 AC

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