A15364 | Triameter

— What is my mission?



— To count graph diameters.

You and Your Submission



A tree is a connected undirected graph without cycles. A weighted tree has a weight assigned to each edge. The degree of a vertex is the number of edges connected to this vertex.

You are given a weighted tree with $n$ vertices, each edge has a weight of $1$ . Let $L$ be the set of vertices with degree equal to $1$ .

You have to answer $q$ independent queries. In the $i$ -th query:

1. You are given a positive integer $x_i$ .
2. For all $u,v \in L$ such that $u < v$ , add edge $(u, v)$ with weight $x_i$ to the graph (initially the given tree).
3. Find the diameter of the resulting graph.

The diameter of a graph is equal to $\max\limits_{1 \le u < v \le n}{\operatorname{d}(u, v)}$ , where $\operatorname{d}(u, v)$ is the length of the shortest path between vertex $u$ and vertex $v$ .

The first line contains a single integer $n$ ( $3 \le n \le 10^6$ ).

The second line contains $n - 1$ integers $p_2,p_3,\ldots,p_n$ ( $1 \le p_i < i$ ) indicating that there is an edge between vertices $i$ and $p_i$ . It is guaranteed that the given edges form a tree.

The third line contains a single integer $q$ ( $1 \le q \le 10$ ).

The fourth line contains $q$ integers $x_1,x_2,\ldots,x_q$ ( $1 \le x_i \le n$ ). All $x_i$ are distinct.

Print $q$ integers in a single line — the answers to the queries.