乳牛馬拉松 - Problem

#22686. 乳牛馬拉松

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聽聞美國肥胖症盛行，Farmer John 想讓牛多運動，決定舉辦乳牛馬拉松。路線包含兩座農場及以一連串道路相連的路徑。為使牛盡量運動，他想找地圖中最遠的兩座農場，距離以兩者之間路徑的道路總長衡量。請幫他求這對最遠農場的距離。

輸入格式

第 1 行及之後：格式與「Navigation Nightmare」相同。

輸出格式

第 1 行：整數，最遠兩座農場的距離。

範例

輸入格式 1

輸出格式 1

說明

輸入格式

農場配置與第 1 題相同。

說明 — 輸出格式

最長馬拉松由農場 2 經過道路 4、1、6、3 到農場 5，長度 $20+3+13+9+7=52$。

題目作者：Brian Dean，2004

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