As we know, now there is efficient algorithms to find the overall min-cut in a directed graph, e.g. Hao and Orlin (1994). 3 m9 H6 A8 \: g% x1 e5 j8 |* ~ ; q9 m; k+ d; ^3 ENow my problem is to find an overall min-cut just separating some given node pairs, not all the node pairs. For example, I have an 8-node digraph with capacities on each arc and want to find the overall min-cut separating some node pairs such as 8 and 1, 6 and 3, 7 and 1. The algorithm of Hao and Orlin (1994) cannot solve my problem. " ], ^* Y* n& o& E' X * r4 Q+ P9 c+ Y: v. c2 ?1 L! A 2 C6 a/ e8 |5 }不好意思,我用英文至少为了把问题说的更清楚一点