AtCoder Regular Contest 088
F
Christmas Tree
AtCoder
⌀ 2983
原题
← E→
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Problem Statement

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Takahashi has decided to make a Christmas Tree for the Christmas party in AtCoder, Inc.

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A Christmas Tree is a tree with $N$ vertices numbered $1$ through $N$ and $N-1$ edges, whose $i$-th edge $(1\leq i\leq N-1)$ connects Vertex $a_i$ and $b_i$.

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He would like to make one as follows:

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  • Specify two non-negative integers $A$ and $B$.
  • Prepare $A$ Christmas Paths whose lengths are at most $B$. Here, a Christmas Path of length $X$ is a graph with $X+1$ vertices and $X$ edges such that, if we properly number the vertices $1$ through $X+1$, the $i$-th edge $(1\leq i\leq X)$ will connect Vertex $i$ and $i+1$.
  • Repeat the following operation until he has one connected tree:
  • Select two vertices $x$ and $y$ that belong to different connected components. Combine $x$ and $y$ into one vertex. More precisely, for each edge $(p,y)$ incident to the vertex $y$, add the edge $(p,x)$. Then, delete the vertex $y$ and all the edges incident to $y$.
  • Properly number the vertices in the tree.
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Takahashi would like to find the lexicographically smallest pair $(A,B)$ such that he can make a Christmas Tree, that is, find the smallest $A$, and find the smallest $B$ under the condition that $A$ is minimized.

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Solve this problem for him.

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Constraints

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  • $2 \leq N \leq 10^5$
  • $1 \leq a_i,b_i \leq N$
  • The given graph is a tree.
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Input

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Input is given from Standard Input in the following format:

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N
a_1 b_1
:
a_{N-1} b_{N-1}

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Output

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For the lexicographically smallest $(A,B)$, print $A$ and $B$ with a space in between.

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样例

Input #1
7
1 2
2 3
2 4
4 5
4 6
6 7
Output #1
3 2
We can make a Christmas Tree as shown in the figure below: ![image](https://img.atcoder.jp/arc088/96f78221624d6a13628f6052f5db697d.png)
Input #2
8
1 2
2 3
3 4
4 5
5 6
5 7
5 8
Output #2
2 5
Input #3
10
1 2
2 3
3 4
2 5
6 5
6 7
7 8
5 9
10 5
Output #3
3 4
题目信息
题号
arc088_d
时间限制
2 s
内存限制
256 MB

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。