城市旅行

题目描述

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输入格式

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输出格式

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样例输入

4 5
1 3 2 5
1 2
1 3
2 4
4 2 4
1 2 4
2 3 4
3 1 4 1
4 1 4

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样例输出

16/3
6/1

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提示

对于所有数据满足 1<=N<=50,000 1<=M<=50,000 1<=Ai<=10^6 1<=D<=100 1<=U,V<=N

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题目来源

wyx528命题