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费用流水过、、、、建图： (1):每个点向他可以到的第一个点连<INF,0>,和他可以到达的其余点连<INF,1> (2):scr向A连<1,0> (3):B向sink连<1,0> (4):然后从scr向sink找增广路 (5):找到则输出dis[sink];否则输出-1 16ms AC、、、、 Followed by:
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