A12796 | Red Blue Tree

You are given a tree of $n$ nodes. The tree is rooted at node $1$ , which is not considered as a leaf regardless of its degree.

Each leaf of the tree has one of the two colors: red or blue. Leaf node $v$ initially has color $s_{v}$ .

The color of each of the internal nodes (including the root) is determined as follows.

- Let $b$ be the number of blue immediate children, and $r$ be the number of red immediate children of a given vertex.
- Then the color of this vertex is blue if and only if $b - r \ge k$ , otherwise red.

Integer $k$ is a parameter that is same for all the nodes.

You need to handle the following types of queries:

- 1 v: print the color of node $v$ ;
- 2 v c: change the color of leaf $v$ to $c$ ( $c = 0$ means red, $c = 1$ means blue);
- 3 h: update the current value of $k$ to $h$ .

The first line of the input consists of two integers $n$ and $k$ ( $2 \le n \le 10^{5}$ , $-n \le k \le n$ ) — the number of nodes and the initial parameter $k$ .

Each of the next $n - 1$ lines contains two integers $u$ and $v$ ( $1 \le u,v \le n$ ), denoting that there is an edge between vertices $u$ and $v$ .

The next line consists of $n$ space separated integers — the initial array $s$ ( $-1 \le s_i \le 1$ ). $s_{i} = 0$ means that the color of node $i$ is red. $s_{i} = 1$ means that the color of node $i$ is blue. $s_{i} = -1$ means that the node $i$ is not a leaf.

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

$q$ lines follow, each containing a query in one of the following queries:

- 1 v ( $1 \le v \le n$ ): print the color of node $v$ ;
- 2 v c ( $1 \le v \le n$ , $c = 0$ or $c = 1$ ): change the color of leaf $v$ to $c$ ( $c = 0$ means red, $c = 1$ means blue). It is guaranteed that $v$ is a leaf;
- 3 h ( $-n \le h \le n$ ): update the current value of $k$ to $h$ .

For each query of the first type, print $0$ if the color of vertex $v$ is red, and $1$ otherwise.