正确的样例

P3218 [HNOI2011] 赛车游戏

@[chen_zhe](/space/show?uid=8457) @[yjjr](/space/show?uid=5088)
by 斯德哥尔摩 @ 2018-10-10 22:59:57


@[songyuchen](/space/show?uid=21377) fixed
by yjjr @ 2018-10-11 02:48:31


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