AtCoder Beginner Contest 138
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Problem Statement
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Given is a rooted tree with $N$ vertices numbered $1$ to $N$. The root is Vertex $1$, and the $i$-th edge $(1 \leq i \leq N - 1)$ connects Vertex $a_i$ and $b_i$.
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Each of the vertices has a counter installed. Initially, the counters on all the vertices have the value $0$.
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Now, the following $Q$ operations will be performed:
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- Operation
$j$$(1 \leq j \leq Q)$: Increment by$x_j$the counter on every vertex contained in the subtree rooted at Vertex$p_j$.
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Find the value of the counter on each vertex after all operations.
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Constraints
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$2 \leq N \leq 2 \times 10^5$$1 \leq Q \leq 2 \times 10^5$$1 \leq a_i < b_i \leq N$$1 \leq p_j \leq N$$1 \leq x_j \leq 10^4$- The given graph is a tree.
- All values in input are integers.
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Input
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Input is given from Standard Input in the following format:
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N Q
a_1 b_1
:
a_{N-1} b_{N-1}
p_1 x_1
:
p_Q x_Q
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Output
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Print the values of the counters on Vertex $1, 2, \ldots, N$ after all operations, in this order, with spaces in between.
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样例
Input #1
4 3
1 2
2 3
2 4
2 10
1 100
3 1
Output #1
100 110 111 110
The tree in this input is as follows:

Each operation changes the values of the counters on the vertices as follows:
- Operation $1$: Increment by $10$ the counter on every vertex contained in the subtree rooted at Vertex $2$, that is, Vertex $2, 3, 4$. The values of the counters on Vertex $1, 2, 3, 4$ are now $0, 10, 10, 10$, respectively.
- Operation $2$: Increment by $100$ the counter on every vertex contained in the subtree rooted at Vertex $1$, that is, Vertex $1, 2, 3, 4$. The values of the counters on Vertex $1, 2, 3, 4$ are now $100, 110, 110, 110$, respectively.
- Operation $3$: Increment by $1$ the counter on every vertex contained in the subtree rooted at Vertex $3$, that is, Vertex $3$. The values of the counters on Vertex $1, 2, 3, 4$ are now $100, 110, 111, 110$, respectively.
Input #2
6 2
1 2
1 3
2 4
3 6
2 5
1 10
1 10
Output #2
20 20 20 20 20 20
题目信息
题面与样例版权归 AtCoder 及出题人所有;中文翻译由 AI 生成(CI 管线),如有出入请以原文为准。