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POJ 2112 Optimal Milking(Floyd+二分答案+网络流)

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FJ has moved his K (1 <= K <= 30) milking machines out into the cow pastures among the C (1 <= C <= 200) cows. A set of paths of various lengths runs among the cows and the milking machines. The milking machine locations are named by ID numbers 1..K; the cow locations are named by ID numbers K+1..K+C. FJ has moved his K (1 <= K <= 30) milking machines


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