CF258E.Little Elephant and Tree
提高+/省选-
通过率:0%
时间限制:4.00s
内存限制:256MB
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题目描述
The Little Elephant loves trees very much, he especially loves root trees.
He's got a tree consisting of n nodes (the nodes are numbered from 1 to n), with root at node number 1. Each node of the tree contains some list of numbers which initially is empty.
The Little Elephant wants to apply m operations. On the i-th operation (1 ≤ i ≤ m) he first adds number i to lists of all nodes of a subtree with the root in node number a__i, and then he adds number i to lists of all nodes of the subtree with root in node b__i.
After applying all operations the Little Elephant wants to count for each node i number c__i — the number of integers j (1 ≤ j ≤ n; j ≠ i), such that the lists of the i-th and the j-th nodes contain at least one common number.
Help the Little Elephant, count numbers c__i for him.
小象非常喜欢树,尤其是有根树。
他有一棵由 n 个节点组成的树(节点编号为 1 到 n),根节点为节点 1。树中每个节点都包含一个数字列表,初始时该列表为空。
小象希望执行 m 次操作。在第 i 次操作(1≤i≤m)中,他首先将数字 i 添加到以节点 ai 为根的子树中所有节点的列表中,然后将数字 i 添加到以节点 bi 为根的子树中所有节点的列表中。
在执行完所有操作后,小象希望对每个节点 i 计算数 ci —— 即满足如下条件的整数 j 的个数(1≤j≤n;j=i):第 i 个节点与第 j 个节点的列表中至少含有一个相同的数字。
请帮助小象计算出各个 ci。
输入格式
The first line contains two integers n and m (1 ≤ n, m ≤ 105) — the number of the tree nodes and the number of operations.
Each of the following n - 1 lines contains two space-separated integers, u__i and v__i (1 ≤ u__i, v__i ≤ n, u__i ≠ v__i), that mean that there is an edge between nodes number u__i and v__i.
Each of the following m lines contains two space-separated integers, a__i and b__i (1 ≤ a__i, b__i ≤ n, a__i ≠ b__i), that stand for the indexes of the nodes in the i-th operation.
It is guaranteed that the given graph is an undirected tree.
第一行包含两个整数 n 和 m(1≤n,m≤105)—— 分别表示树的节点数和操作数。
接下来的 n−1 行,每行包含两个用空格分隔的整数 ui 和 vi(1≤ui,vi≤n,且 ui=vi),表示节点 ui 与节点 vi 之间存在一条边。
再接下来的 m 行,每行包含两个用空格分隔的整数 ai 和 bi(1≤ai,bi≤n,且 ai=bi),表示第 i 次操作所涉及的两个节点的编号。
保证给定的图是一棵无向树。
输出格式
In a single line print n space-separated integers — _c_1, _c_2, ..., c__n.
在一行中输出 n 个空格分隔的整数 — _c_1, _c_2, ..., c__n。
输入输出样例
输入#1
5 1 1 2 1 3 3 5 3 4 2 3
输出#1
0 3 3 3 3
输入#2
11 3 1 2 2 3 2 4 1 5 5 6 5 7 5 8 6 9 8 10 8 11 2 9 3 6 2 8
输出#2
0 6 7 6 0 2 0 5 4 5 5
输入解题思路,AI测评打分。不知道怎么写?