Codeforces Round 766 (Div. 2)
E
Not Escaping
Codeforces
2200
原题
← DF →
翻译中…

Major Ram is being chased by his arch enemy Raghav. Ram must reach the top of the building to escape via helicopter. The building, however, is on fire. Ram must choose the optimal path to reach the top of the building to lose the minimum amount of health.

翻译中…

The building consists of $n$ floors, each with $m$ rooms each. Let $(i, j)$ represent the $j$-th room on the $i$-th floor. Additionally, there are $k$ ladders installed. The $i$-th ladder allows Ram to travel from $(a_i, b_i)$ to $(c_i, d_i)$, but not in the other direction. Ram also gains $h_i$ health points if he uses the ladder $i$. It is guaranteed $a_i \lt c_i$ for all ladders.

翻译中…

If Ram is on the $i$-th floor, he can move either left or right. Travelling across floors, however, is treacherous. If Ram travels from $(i, j)$ to $(i, k)$, he loses $|j-k| \cdot x_i$ health points.

翻译中…

Ram enters the building at $(1, 1)$ while his helicopter is waiting at $(n, m)$. What is the minimum amount of health Ram loses if he takes the most optimal path? Note this answer may be negative (in which case he gains health). Output "NO ESCAPE" if no matter what path Ram takes, he cannot escape the clutches of Raghav.

翻译中…

image

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Input

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The first line of input contains $t$ ($1 \leq t \leq 5 \cdot 10^4$) — the number of test cases.

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The first line of each test case consists of $3$ integers $n, m, k$ ($2 \leq n, m \leq 10^5$; $1 \leq k \leq 10^5$) — the number of floors, the number of rooms on each floor and the number of ladders respectively.

翻译中…

The second line of a test case consists of $n$ integers $x_1, x_2, \dots, x_n$ ($1 \leq x_i \leq 10^6$).

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The next $k$ lines describe the ladders. Ladder $i$ is denoted by $a_i, b_i, c_i, d_i, h_i$ ($1 \leq a_i \lt c_i \leq n$; $1 \leq b_i, d_i \leq m$; $1 \leq h_i \leq 10^6$)  — the rooms it connects and the health points gained from using it.

翻译中…

It is guaranteed $a_i \lt c_i$ for all ladders and there is at most one ladder between any 2 rooms in the building.

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The sum of $n$, the sum of $m$, and the sum of $k$ over all test cases do not exceed $10^5$.

翻译中…

Output

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Output the minimum health Ram loses on the optimal path from $(1, 1)$ to $(n, m)$. If Ram cannot escape the clutches of Raghav regardless of the path he takes, output "NO ESCAPE" (all uppercase, without quotes).

翻译中…

Note

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The figure for the first test case is in the statement. There are only $2$ possible paths to $(n, m)$:

翻译中…
  • Ram travels to $(1, 3)$, takes the ladder to $(3, 3)$, travels to $(3, 2)$, takes the ladder to $(5, 1)$, travels to $(5, 3)$ where he finally escapes via helicopter. The health lost would be $$ \begin{align*} &\mathrel{\phantom{=}} x_1 \cdot |1-3| - h_1 + x_3 \cdot |3-2| - h_3 + x_5 \cdot |1-3| \\ &= 5 \cdot 2 - 4 + 8 \cdot 1 - 6 + 4 \cdot 2 \\ &= 16. \end{align*} $$
  • Ram travels to $(1, 3)$, takes the ladder to $(3, 3)$, travels to $(3, 1)$, takes the ladder to $(5, 2)$, travels to $(5, 3)$ where he finally escapes via helicopter. The health lost would be $$ \begin{align*} &\mathrel{\phantom{=}} x_1 \cdot |1-3| - h_1 + x_3 \cdot |3-1| - h_2 + a_5 \cdot |2-3| \\ &= 5 \cdot 2 - 4 + 8 \cdot 2 - 5 + 4 \cdot 1 \\ &= 21. \end{align*} $$
翻译中…

Therefore, the minimum health lost would be $16$.

翻译中…

In the second test case, there is no path to $(n, m)$.

翻译中…

In the third case case, Ram travels to $(1, 3)$ and takes the only ladder to $(5, 3)$. He loses $5 \cdot 2$ health points and gains $h_1 = 100$ health points. Therefore the total loss is $10-100=-90$ (negative implies he gains health after the path).

翻译中…

样例

Input #1
4
5 3 3
5 17 8 1 4
1 3 3 3 4
3 1 5 2 5
3 2 5 1 6
6 3 3
5 17 8 1 4 2
1 3 3 3 4
3 1 5 2 5
3 2 5 1 6
5 3 1
5 17 8 1 4
1 3 5 3 100
5 5 5
3 2 3 7 5
3 5 4 2 1
2 2 5 4 5
4 4 5 2 3
1 2 4 2 2
3 3 5 2 4
Output #1
16
NO ESCAPE
-90
27
InputCopy OutputCopy
题目信息
题号
1627E
时间限制
2 s
内存限制
256 MB
标签
数据结构
动态规划
模拟
最短路
双指针

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。