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Re:太出乎意料了。。。一次就AC了。。。In Reply To:太出乎意料了。。。一次就AC了。。。 Posted by:cssdnx at 2011-05-07 09:27:36 > 抽屉原理~ 每次求前N项和，每个和对N取余，如果能出现0，那么就是答案，如果取了N次没有0，那么就有N个余数，余数的范围为1~n-1，所以必有两个相同的余数，那么取得这两个相同余数的前N项和的差就是答案~ Followed by:
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