题面有一个很小的 bug

P2533 [AHOI2012] 信号塔

@[WYXkk](/user/130151) @[zhouwc](/user/20218)
by Eason_AC @ 2021-07-19 16:22:41


@[Eason_AC](/user/112917) done
by WYXkk @ 2021-07-19 16:28:22


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