5508：GT and trees

You are given a tree with $N$ nodes and $Q$ questions.

All nodes have a value.Nodes on tree is numbered by $1~N$.

The questions have two types:

①$0$ $x$ $y$:Change node $x$'s value to $y$

②$1$ $x$ $y$ :you should output the maxinum times of some value that in the path from node $x$ to node $y$,

In the first line there is a number $T$——The test numbers.

(In the finall test $T \leq 5$,and there are at most $2$ tests that $N>100$.)

For each test:

In the first line there are two numbers $N$ and $Q$.

In the next $N-1$ lines there are pairs of $(X,Y)$.It means there is a road between $x$ and $y$.

In the following line there are $N$ numbers $A_1..A_N$.$A_i$ means the value of node $i$ in the initial time.

In the last $Q$ lines there are three numbers.The meaning is above.

$1 \leq N,Q \leq 50000$,the value is in $[1,n]$.

You'd better print the enter in the last line when you hack others.

You'd better not print space in the last of each line when you hack others.

For each question in each test,output the answer.