Codeforces Round 601 (Div. 1) |
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Finished |

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data structures

probabilities

trees

*2700

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D. Tree Queries

time limit per test

5 secondsmemory limit per test

512 megabytesinput

standard inputoutput

standard outputHanh is a famous biologist. He loves growing trees and doing experiments on his own garden.

One day, he got a tree consisting of $$$n$$$ vertices. Vertices are numbered from $$$1$$$ to $$$n$$$. A tree with $$$n$$$ vertices is an undirected connected graph with $$$n-1$$$ edges. Initially, Hanh sets the value of every vertex to $$$0$$$.

Now, Hanh performs $$$q$$$ operations, each is either of the following types:

- Type $$$1$$$: Hanh selects a vertex $$$v$$$ and an integer $$$d$$$. Then he chooses some vertex $$$r$$$ uniformly at random, lists all vertices $$$u$$$ such that the path from $$$r$$$ to $$$u$$$ passes through $$$v$$$. Hanh then increases the value of all such vertices $$$u$$$ by $$$d$$$.
- Type $$$2$$$: Hanh selects a vertex $$$v$$$ and calculates the expected value of $$$v$$$.

Since Hanh is good at biology but not math, he needs your help on these operations.

Input

The first line contains two integers $$$n$$$ and $$$q$$$ ($$$1 \leq n, q \leq 150\,000$$$) — the number of vertices on Hanh's tree and the number of operations he performs.

Each of the next $$$n - 1$$$ lines contains two integers $$$u$$$ and $$$v$$$ ($$$1 \leq u, v \leq n$$$), denoting that there is an edge connecting two vertices $$$u$$$ and $$$v$$$. It is guaranteed that these $$$n - 1$$$ edges form a tree.

Each of the last $$$q$$$ lines describes an operation in either formats:

- $$$1$$$ $$$v$$$ $$$d$$$ ($$$1 \leq v \leq n, 0 \leq d \leq 10^7$$$), representing a first-type operation.
- $$$2$$$ $$$v$$$ ($$$1 \leq v \leq n$$$), representing a second-type operation.

It is guaranteed that there is at least one query of the second type.

Output

For each operation of the second type, write the expected value on a single line.

Let $$$M = 998244353$$$, it can be shown that the expected value can be expressed as an irreducible fraction $$$\frac{p}{q}$$$, where $$$p$$$ and $$$q$$$ are integers and $$$q \not \equiv 0 \pmod{M}$$$. Output the integer equal to $$$p \cdot q^{-1} \bmod M$$$. In other words, output such an integer $$$x$$$ that $$$0 \le x < M$$$ and $$$x \cdot q \equiv p \pmod{M}$$$.

Example

Input

5 12 1 2 1 3 2 4 2 5 1 1 1 2 1 2 2 2 3 2 4 2 5 1 2 2 2 1 2 2 2 3 2 4 2 5

Output

1 199648871 399297742 199648871 199648871 598946614 199648873 2 2 2

Note

The image below shows the tree in the example:

For the first query, where $$$v = 1$$$ and $$$d = 1$$$:

- If $$$r = 1$$$, the values of all vertices get increased.
- If $$$r = 2$$$, the values of vertices $$$1$$$ and $$$3$$$ get increased.
- If $$$r = 3$$$, the values of vertices $$$1$$$, $$$2$$$, $$$4$$$ and $$$5$$$ get increased.
- If $$$r = 4$$$, the values of vertices $$$1$$$ and $$$3$$$ get increased.
- If $$$r = 5$$$, the values of vertices $$$1$$$ and $$$3$$$ get increased.

Hence, the expected values of all vertices after this query are ($$$1, 0.4, 0.8, 0.4, 0.4$$$).

For the second query, where $$$v = 2$$$ and $$$d = 2$$$:

- If $$$r = 1$$$, the values of vertices $$$2$$$, $$$4$$$ and $$$5$$$ get increased.
- If $$$r = 2$$$, the values of all vertices get increased.
- If $$$r = 3$$$, the values of vertices $$$2$$$, $$$4$$$ and $$$5$$$ get increased.
- If $$$r = 4$$$, the values of vertices $$$1$$$, $$$2$$$, $$$3$$$ and $$$5$$$ get increased.
- If $$$r = 5$$$, the values of vertices $$$1$$$, $$$2$$$, $$$3$$$ and $$$4$$$ get increased.

Hence, the expected values of all vertices after this query are ($$$2.2, 2.4, 2, 2, 2$$$).

Codeforces (c) Copyright 2010-2024 Mike Mirzayanov

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