这。。。四种颜色。。是因为set吗?

P2542 [AHOI2005] 航线规划

stO 爆切紫题 Orz
by Andy_chen @ 2020-07-02 12:08:28


四种颜色可还行
by WanderingTrader @ 2020-07-02 12:11:05


btd,kjl
by JRzyh @ 2020-07-02 12:22:58


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