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没用最小费用流，随便建了个图然后求了个最小割就过了..源点到每行有一条权值为ri的边，每列到汇点有一条权值为ci的边。如果一行和一列有伞兵降落，那么行--->列有一条正无穷的边，然后求最小割就ac了..完全靠直觉..ft~ Followed by: Post your reply here: |
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