QOJ.ac

QOJ

時間限制: 5 s 記憶體限制: 512 MB 總分: 100

#9636. Easy Problem

统计

You are given a cactus graph $G$ with $n$ vertices and $m$ edges, where each vertex $i$ has a weight $a_i$. (A cactus graph is defined as a simple undirected connected graph where each edge belongs to at most one simple cycle.)

There are $q$ queries. Each query provides an integer $k$. You need to choose a non-empty subtree (a connected subgraph of the cactus that contains no cycles) and a vertex $r$ within that subtree, such that the sum of distances from all vertices in the subtree to $r$ within the chosen subtree is at least $k$. Among all such possible choices, find the maximum possible greatest common divisor (GCD) of the weights of all vertices in the chosen subtree.

Input

The first line contains four integers $C, n, m, q$, where $C$ is the subtask number ($C = 0$ for the sample).

The next line contains $n$ positive integers $a_i$.

The next $m$ lines each contain two positive integers $u, v$, representing an undirected edge between $u$ and $v$.

The next $q$ lines each contain a positive integer $k$.

All variables above have the same meanings as described in the problem statement.

Output

Output $q$ lines, each containing a single integer representing the answer to the corresponding query. Specifically, if no such subtree exists, output -1.

Examples

Input 1

0 5 6 1
2 4 6 8 9
1 2
1 3
2 3
2 4
2 5
4 5
5

Output 1

2

See the provided files for more examples.

Constraints

For all data, $3 \le n \le 2 \times 10^5$, $n - 1 \le m \le \min \{2n, 2 \times 10^5\}$, $1 \le a_i \le A \le 10^6$, $1 \le u, v \le n$, $1 \le q \le 2 \times 10^5$, $1 \le k \le 10^{10}$. It is guaranteed that the input is a cactus graph.

Subtask ID $n$ $m$ $q$ $A$ Dependencies Score
$1$ $\le 5$ N/A $=1$ $=20$ None $10$
$2$ $\le 20$ N/A $\le 20$ $=20$ $1$ $10$
$3$ N/A $=n-1$ N/A N/A None $20$
$4$ N/A $=n$ N/A N/A $3$ $20$
$5$ $\le 100$ N/A N/A N/A $2$ $20$
$6$ N/A N/A N/A N/A $4,5$ $20$

Editorials

IDTypeStatusTitlePosted ByLast UpdatedActions
EditorialOpen Official EditorialQingyu- Download

Discussions

About Discussions

The discussion section is only for posting: General Discussions (problem-solving strategies, alternative approaches), and Off-topic conversations.

This is NOT for reporting issues! If you want to report bugs or errors, please use the Issues section below.

Open Discussions 0
No discussions in this category.

Issues

About Issues

If you find any issues with the problem (statement, scoring, time/memory limits, test cases, etc.), you may submit an issue here. A problem moderator will review your issue.

Guidelines:

  1. This is not a place to publish discussions, editorials, or requests to debug your code. Issues are only visible to you and problem moderators.
  2. Do not submit duplicated issues.
  3. Issues must be filed in English or Chinese only.
Active Issues 0
No issues in this category.
Closed/Resolved Issues 0
No issues in this category.