Andryusha and Colored Balloons

题意翻译

题意: 有一颗n个节点的树,进行有限制染色,问染色的最少颜色数,以及每个点的颜色(从1标号,标号不能超过颜色数). 限制:相邻三个点的颜色不能相同. 输入格式: 第一行一个n, 接下来n-1行<x,y>,表示x与y之间有一条连边. 输出格式: 第一行一个数,为最小颜色数. 接下来n个数,为[1,n]的点的颜色. 数据范围: n:[3,2e5]

题目描述

Andryusha goes through a park each day. The squares and paths between them look boring to Andryusha, so he decided to decorate them. The park consists of $ n $ squares connected with $ (n-1) $ bidirectional paths in such a way that any square is reachable from any other using these paths. Andryusha decided to hang a colored balloon at each of the squares. The baloons' colors are described by positive integers, starting from $ 1 $ . In order to make the park varicolored, Andryusha wants to choose the colors in a special way. More precisely, he wants to use such colors that if $ a $ , $ b $ and $ c $ are distinct squares that $ a $ and $ b $ have a direct path between them, and $ b $ and $ c $ have a direct path between them, then balloon colors on these three squares are distinct. Andryusha wants to use as little different colors as possible. Help him to choose the colors!

输入输出格式

输入格式

The first line contains single integer $ n $ ( $ 3<=n<=2·10^{5} $ ) — the number of squares in the park. Each of the next $ (n-1) $ lines contains two integers $ x $ and $ y $ ( $ 1<=x,y<=n $ ) — the indices of two squares directly connected by a path. It is guaranteed that any square is reachable from any other using the paths.

输出格式

In the first line print single integer $ k $ — the minimum number of colors Andryusha has to use. In the second line print $ n $ integers, the $ i $ -th of them should be equal to the balloon color on the $ i $ -th square. Each of these numbers should be within range from $ 1 $ to $ k $ .

输入输出样例

输入样例 #1

3
2 3
1 3

输出样例 #1

3
1 3 2 

输入样例 #2

5
2 3
5 3
4 3
1 3

输出样例 #2

5
1 3 2 5 4 

输入样例 #3

5
2 1
3 2
4 3
5 4

输出样例 #3

3
1 2 3 1 2 

说明

In the first sample the park consists of three squares: $ 1→3→2 $ . Thus, the balloon colors have to be distinct. Illustration for the first sample.In the second example there are following triples of consequently connected squares: - $ 1→3→2 $ - $ 1→3→4 $ - $ 1→3→5 $ - $ 2→3→4 $ - $ 2→3→5 $ - $ 4→3→5 $ We can see that each pair of squares is encountered in some triple, so all colors have to be distinct. Illustration for the second sample.In the third example there are following triples: - $ 1→2→3 $ - $ 2→3→4 $ - $ 3→4→5 $ We can see that one or two colors is not enough, but there is an answer that uses three colors only. Illustration for the third sample.