Codeforces Round 497 (Div. 1)
D
Ants
Codeforces
3200
原题
← CE →
翻译中…

There is a tree with $n$ vertices. There are also $m$ ants living on it. Each ant has its own color. The $i$-th ant has two favorite pairs of vertices: ($a_i, b_i$) and ($c_i, d_i$). You need to tell if it is possible to paint the edges of the tree in $m$ colors so that every ant will be able to walk between vertices from one of its favorite pairs using only edges of his color; if it is possible, you need to print which pair every ant should use.

翻译中…

Input

翻译中…

The first line contains a single integer $n$ ($2 \leq n \leq 10^5$) — the number of vertices.

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Each of the next $n-1$ lines contains two integers $u_i$ and $v_i$ ($1 \leq u_i, v_i \leq n$), meaning that there is an edge between vertices $u_i$ and $v_i$.

翻译中…

The next line contains a single integer $m$ ($1 \leq m \leq 10^4$) — the number of ants.

翻译中…

Each of the next $m$ lines contains four integers $a_i$, $b_i$, $c_i$, and $d_i$ ($1 \leq a_i, b_i, c_i, d_i \leq n$, $a_i \neq b_i, c_i \neq d_i$), meaning that pairs ($a_i$, $b_i$) and ($c_i$, $d_i$) are favorite for the $i$-th ant.

翻译中…

Output

翻译中…

Print "NO" (without quotes) if the wanted painting is impossible.

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Otherwise, print "YES" (without quotes). Print $m$ lines. On the $i$-th line, print $1$ if the $i$-th ant will use the first pair and $2$ otherwise. If there are multiple answers, print any.

翻译中…

Note

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In the sample, the second and the third edge should be painted in the first color, the first and the fifth should be painted in the second color, and the fourth should be painted in the third color.

翻译中…

样例

Input #1
6
1 2
3 1
4 1
5 2
6 2
3
2 6 3 4
1 6 6 5
1 4 5 2
Output #1
YES
2
1
2
InputCopy OutputCopy
Input #2
5
1 2
1 3
1 4
1 5
2
2 3 4 5
3 4 5 2
Output #2
NO
InputCopy OutputCopy
题目信息
题号
1007D
时间限制
3 s
内存限制
768 MB
标签
2-SAT
数据结构
树

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