有人见过这个问题吗?
我们得到了每个顶端的脊椎 V_ 1,..., V_n 和可能的母体套件。 每个父体套件都有相关成本 。 让 O 做一个顶端的顺序( 变换 ) 。 我们说, 一个顶端 V_ i 的父体组符合命令 O 。 如果所有父母都在命令的顶端前, 让 mcc( V_ i, O) 成为符合命令 O 的顶端组的最小成本 。 我需要找到一个命令 O, 以最小化总成本 : mcc( V_ 1, O),. mcc( V_ n, O ) 。
我不太明白"如果所有的父母 都来之前的顶端 在命令。"是什么意思?
不,我以前没见过这个问题
至于你不确定的一点--命令只是所有顶点的顺序, 所以我想,“如果所有父母都来之前的顶点在命令中” 完全是指它所写的。例如,(A, B) 说, 父母中的一方是D: 父母的一组符合命令[A, B, C, D], 因为A和B在D之前, 而不是命令[A, D, B, C], 因为B在D之后; 但是,说(A) 是另一组D的家长―― 两者都符合。这是否有意义?
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