#AT1546. F - Distributing Integers
F - Distributing Integers
F - Distributing Integers
Score : $600$ points
Problem Statement
We have a tree with $N$ vertices numbered $1$ to $N$. The $i$-th edge in this tree connects Vertex $a_i$ and $b_i$. For each $k=1, ..., N$, solve the problem below:
- Consider writing a number on each vertex in the tree in the following manner:
- First, write $1$ on Vertex $k$.
- Then, for each of the numbers $2, ..., N$ in this order, write the number on the vertex chosen as follows:
- Choose a vertex that still does not have a number written on it and is adjacent to a vertex with a number already written on it. If there are multiple such vertices, choose one of them at random.
- Find the number of ways in which we can write the numbers on the vertices, modulo $(10^9+7)$.
Constraints
- $2 \leq N \leq 2 \times 10^5$
- $1 \leq a_i,b_i \leq N$
- The given graph is a tree.
Input
Input is given from Standard Input in the following format:
Output
For each $k=1, 2, ..., N$ in this order, print a line containing the answer to the problem.
3
1 2
1 3
2
1
1
The graph in this input is as follows:
For $k=1$, there are two ways in which we can write the numbers on the vertices, as follows:
- Writing $1, 2, 3$ on Vertex $1, 2, 3$, respectively
- Writing $1, 3, 2$ on Vertex $1, 2, 3$, respectively
2
1 2
1
1
The graph in this input is as follows:
5
1 2
2 3
3 4
3 5
2
8
12
3
3
The graph in this input is as follows:
8
1 2
2 3
3 4
3 5
3 6
6 7
6 8
40
280
840
120
120
504
72
72
The graph in this input is as follows:
相关
在下列比赛中: