题目描述
Air Bovinia operates flights connecting the N farms that thecows live on (1 <= N <= 20,000). As with any airline, K of these farmshave been designated as hubs (1 <= K <= 200, K <= N).Air Bovinia operates flights connecting
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luogu P3096 [USACO13DEC]假期计划（黄金）Vacation Planning (gold)_zhouhongkai06的博客
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