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四月 08, 2019 · OI 题解
有一张顶点数为 $(L+1)\times n$ 的有向图。这张图的每个顶点由一个二元组$(u,v)$表示$(0\le u\le L,1\le v\le n)$。这张图不是简单图,对于任意两个顶点 $(u_1,v_1)(u_2,v_2)$,如果 $u_1<u_2$,则从 $(u_1,v_1)$ 到 $(u_2,v_2)$ 一共有 $w[v_1][v_2]$ 条不同的边,如果 $u_1\ge u_2$...