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F - Wormholes 题目链接：https://vjudge.net/contest/66569#problem/F 题目： While exploring his many farms, Farmer John has discovered a number of amazing wormh 阅读全文
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E - Currency Exchang 题目链接：https://vjudge.net/contest/66569#problem/E 题目： Several currency exchange points are working in our city. Let us suppose that 阅读全文
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D - Silver Cow Party（双向边） 题目链接：https://vjudge.net/contest/66569#problem/D 题目： One cow from each of N farms (1 ≤ N ≤ 1000) conveniently numbered 1..N i 阅读全文
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C - Heavy Transportation 题目链接：https://vjudge.net/contest/66569#problem/C 题目： Background Hugo Heavy is happy. After the breakdown of the Cargolifter pr 阅读全文
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B - Frogger（spfa） 题目链接：https://vjudge.net/contest/66569#problem/B 题目： Freddy Frog is sitting on a stone in the middle of a lake. Suddenly he notices F 阅读全文