题目描述
The good folks in Texas are having a heatwave this summer. Their Texas Longhorn cows make for good eating but are not so adept at creating creamy delicious dairy products. Farmer John is leading the charge to deliver plenty of ice cold nutritious milk to Texas so the Texans will not suffer the heat too much. The good folks in Texas are having
阅读背景：
P1339 [USACO09OCT]热浪Heat Wave（最短路水题）_tomjobs的博客
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