Codeforces Round 621 (Div. 1 + Div. 2)
G
Cow and Exercise
Codeforces
3100
原题
← F→
翻译中…

Farmer John is obsessed with making Bessie exercise more!

翻译中…

Bessie is out grazing on the farm, which consists of $n$ fields connected by $m$ directed roads. Each road takes some time $w_i$ to cross. She is currently at field $1$ and will return to her home at field $n$ at the end of the day.

翻译中…

Farmer John has plans to increase the time it takes to cross certain roads. He can increase the time it takes to cross each road by a nonnegative amount, but the total increase cannot exceed $x_i$ for the $i$-th plan.

翻译中…

Determine the maximum he can make the shortest path from $1$ to $n$ for each of the $q$ independent plans.

翻译中…

Input

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The first line contains integers $n$ and $m$ ($2 \le n \le 50$, $1 \le m \le n \cdot (n-1)$) — the number of fields and number of roads, respectively.

翻译中…

Each of the following $m$ lines contains $3$ integers, $u_i$, $v_i$, and $w_i$ ($1 \le u_i, v_i \le n$, $1 \le w_i \le 10^6$), meaning there is an road from field $u_i$ to field $v_i$ that takes $w_i$ time to cross.

翻译中…

It is guaranteed that there exists a way to get to field $n$ from field $1$. It is guaranteed that the graph does not contain self-loops or parallel edges. It is possible to have a road from $u$ to $v$ and a road from $v$ to $u$.

翻译中…

The next line contains a single integer $q$ ($1 \le q \le 10^5$), the number of plans.

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Each of the following $q$ lines contains a single integer $x_i$, the query ($0 \le x_i \le 10^5$).

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Output

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For each query, output the maximum Farmer John can make the shortest path if the total increase does not exceed $x_i$.

翻译中…

Your answer is considered correct if its absolute or relative error does not exceed $10^{-6}$.

翻译中…

Formally, let your answer be $a$, and the jury's answer be $b$. Your answer is accepted if and only if $\frac{|a - b|}{\max{(1, |b|)}} \le 10^{-6}$.

翻译中…

样例

Input #1
3 3
1 2 2
2 3 2
1 3 3
5
0
1
2
3
4
Output #1
3.0000000000
4.0000000000
4.5000000000
5.0000000000
5.5000000000
InputCopy OutputCopy
题目信息
题号
1307G
时间限制
1 s
内存限制
256 MB
标签
网络流
图论
最短路

题面与样例版权归 Codeforces 及出题人所有;中文翻译由 AI 生成(CI 管线),如有出入请以原文为准。