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**牛客7：** 又是一场坐牢场。。。 开局dyc开出签到J，于17minAC，同时zzy开出签到I，于31minAC。 随后三人分开看题，dyc看D，K，ryj看C，D，F，zzy看C，D。 后续dyc于120min左右会做K，并于152minAC。 zzy和ryj提出D的部分思路，但不知道如何进行下去，zzy提出希尔排序，但未从这个角度继续想下去，ryj在F错误的方向越走越远，最后大家一起坐牢到比赛结束。