Universal Cup Judging System

Universal Cup

Time Limit: 2.0 s Memory Limit: 512 MB Total points: 100 Difficulty: [show] Hackable ✓
Statistics

给定一棵树:一个包含 $n$ 个顶点和 $n-1$ 条边的无向连通图。初始时,所有顶点均未被标记。你的任务是处理 $q$ 个以下三种类型的查询:

  • “0 $w$”:取消标记顶点 $w$;如果 $w$ 本身未被标记,则不进行任何操作。
  • “1 $w$”:标记顶点 $w$;如果 $w$ 本身已被标记,则不进行任何操作。
  • “2”:同时对树中所有顶点进行操作:如果一个顶点至少有一个被标记的邻居,则标记该顶点,否则取消标记该顶点。

在每次查询后,求出树中被标记的顶点数量。

输入格式

第一行包含两个整数 $n$ 和 $q$ ($2 \le n \le 3 \cdot 10^5$; $1 \le q \le 10^6$),分别表示树的顶点数和查询次数。

接下来的 $n-1$ 行,每行包含两个整数 $u$ 和 $v$ ($1 \le u, v \le n$),描述树的一条边。

接下来的 $q$ 行,每行表示一个上述格式的查询 ($1 \le w \le n$)。

输出格式

输出一行,包含 $q$ 个整数,表示每次查询后树中被标记的顶点数量。

样例

样例输入 1

8 8
1 2
2 3
2 4
1 5
5 6
5 7
5 8
1 1
2
2
0 1
0 3
0 4
0 5
2

样例输出 1

1 2 6 5 4 3 3 1

样例输入 2

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

样例输出 2

1 2 1 2 2

Editorials

IDTypeStatusTitlePosted ByLast UpdatedActions
#900Editorial Open集训队作业 解题报告 by 王梓丞Anonymous2026-02-24 21:56:38 Download

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