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Time Limit: 1 s Memory Limit: 512 MB Total points: 100

#14292. TEST_130

统计

给定一棵 $n$ 个节点的有根树,定义 $N(w,d)$($w$ 为树的顶点,$d$ 为非负整数) 为以 $w$ 为根的子树中,到 $w$ 距离不超过 $d$ 的点构成的集合。

共 $m$ 次询问,每次给出 $w,d$ 查询 $\{N(w',d')\mid N(w',d')\subseteq N(w,d)\}$ 的大小。

输入格式

第一行两个数 $n,m$。

第二行 $n-1$ 个数 $f_2,\dots,f_n$ ,其中 $f_i$ 表示编号 $i$ 的结点的父亲。

接下来 $m$ 行,每行两个数 $w,d$ 表示一次询问。

输出格式

输出 $m$ 行,依次表示每次查询的答案。

样例数据

样例 1 输入

5 4
1 2 2 3
3 1
3 0
5 0
1 2

样例 1 输出

3
1
1
7

子任务

Idea:nzhtl1477,Solution:ccz181078,Code:ccz181078,Data:ccz181078

对于 $100\%$ 的数据,满足 $1\le n,m\le 10^6$,$1\le f_i < i$,$1\le w\le n$,$0\le d\le n-1$。

对于 $25\%$ 的数据,满足 $n,m\le 100$。

对于另外 $25\%$ 的数据,满足 $n,m\le 5000$。

对于另外 $25\%$ 的数据,满足 $n,m\le 2\times 10^5$。

对于另外 $25\%$ 的数据,无特殊限制。

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