HDU-4292-Food（最大流，拆點，Dinic+向前星）（注意！！此題我認爲超坑啊！！！）

題目連接：http://acm.hdu.edu.cn/showproblem.php?pid=4292php   Problem Descriptionnode 　　You, a part-time dining service worker in your college’s dining hall, are now confused with a new problem: serve as m

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