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谁能讲讲这题怎么贪心吗? 只会用差分约束 (类似1201)

Posted by atlas_of_rruucc at 2004-08-03 00:19:31 on Problem 1716
是不是两次对要求"至少为1"的问题进行贪心?
用贪心过了的高手能讲讲吗? 先谢过了

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