Score : $600$ points

问题描述

Takahashi 拥有一条长度为 $N$ 的序列：$A=(A_1,A_2,\ldots,A_N)$。序列 $A$ 是 $(1,2,\ldots,N)$ 的一个排列。

他打算执行 $Q$ 次操作以创建 $1+Q$ 条序列。他将序列 $A$ 编号为 $0$，然后开始一系列操作。第 $i$ 次操作（$1\leq i\leq Q$）由三个整数 $(t_i,s_i,x_i)$ 表示，并对应以下操作（参见样例输入/输出中的解释）：

• 当 $t_i=1$ 时，他从编号为 $s_i$（$0\leq s_i < i$）的序列中移除第 $x_i$ 个元素之后的所有元素，并保持移除元素的顺序，用这些元素创建一个新的编号为 $i$ 的序列。
• 当 $t_i=2$ 时，他从编号为 $s_i$（$0\leq s_i < i$）的序列中移除所有大于 $x_i$ 的元素，并保持移除元素的顺序，用这些元素创建一个新的编号为 $i$ 的序列。

对于长度为 $L$ 的序列 $X$，其每个元素都是“紧跟在第 $0$ 个元素之后”的元素之一。另外，对于任何满足 $L\leq l$ 的 $l$，序列 $X$ 中的元素都不属于“紧跟在第 $l$ 个元素之后”的元素。

对于 $i=1,2,\ldots,Q$，请找出在第 $i$ 次操作 完成后立即 编号为 $i$ 的序列的长度。

以上为通义千问 qwen-max 翻译，仅供参考。

Problem Statement

Takahashi has a sequence of length $N$: $A=(A _ 1,A _ 2,\ldots,A _ N)$. $A$ is a permutation of $(1,2,\ldots,N)$.

He is going to perform $Q$ operations to create $1+Q$ sequences. He lets $A$ be the sequence numbered $0$, and then begins the series of operations. The $i$-th operation $(1\leq i\leq Q)$ is represented by a triple of integers $(t _ i,s _ i,x _ i)$ and corresponds to the following operation (see also the explanations in Sample Input/Output).

• When $t _ i=1$, he removes the elements following the $x _ i$-th element from the sequence numbered $s _ i$ $(0\leq s _ i\lt i)$, and creates a new sequence numbered $i$ with the removed elements, keeping their order.
• When $t _ i=2$, he removes the elements greater than $x _ i$ from the sequence numbered $s _ i$ $(0\leq s _ i\lt i)$, and creates a new sequence numbered $i$ with the removed elements, keeping their order.

For a sequence $X$ of length $L$, every element of $X$ is among "the elements following the $0$-th element." Also, for any $l$ such that $L\leq l$, no element of $X$ is among "the elements following the $l$-th element."

For $i=1,2,\ldots,Q$, find the length of the sequence numbered $i$ immediately after the $i$-th operation.

Constraints

• $1\leq N\leq2\times10^5$
• $1\leq A _ i\leq N\ (1\leq i\leq N)$
• $A _ i\neq A _ j\ (1\leq i\lt j\leq N)$
• $1\leq Q\leq2\times10^5$
• $t _ i=1,2\ (1\leq i\leq Q)$
• $0\leq s _ i\lt i\ (1\leq i\leq Q)$
• $0\leq x _ i\leq N\ (1\leq i\leq Q)$
• All input values are integers.

Input

The input is given from Standard Input in the following format:

$N$

$A _ 1$ $A _ 2$ $\ldots$ $A _ N$

$Q$

$t _ 1$ $s _ 1$ $x _ 1$

$t _ 2$ $s _ 2$ $x _ 2$

$\vdots$

$t _ Q$ $s _ Q$ $x _ Q$

Output

Print $Q$ lines. The $i$-th line $(1\leq i\leq Q)$ should contain the length of the sequence numbered $i$ immediately after the $i$-th operation.

Sample Input 1

10
1 8 7 4 5 6 3 2 9 10
5
2 0 4
1 1 2
2 0 2
2 2 5
1 0 1

Sample Output 1

6
4
2
3
1

Initially, Takahashi has a sequence $A=(1,8,7,4,5,6,3,2,9,10)$ of length $10$. He lets $A=(1,8,7,4,5,6,3,2,9,10)$ be the sequence numbered $0$, and then begins the series of operations.

In the first operation, he removes elements greater than $4$ from the sequence numbered $0$, namely $8,7,5,6,9,10$, and creates a new sequence numbered $1$ with these elements. After this operation, the sequences numbered $0$ and $1$ are $(1,4,3,2)$ and $(8,7,5,6,9,10)$, respectively.

In the second operation, he removes the elements following the $2$-nd element from the sequence numbered $1$, namely $5,6,9,10$, and creates a new sequence numbered $2$ with these elements. After this operation, the sequences numbered $0$, $1$, and $2$ are $(1,4,3,2)$, $(8,7)$, and $(5,6,9,10)$, respectively.

For the third and subsequent operations, the sequences numbered $0,1,2,\ldots,i$ after the $i$-th operation are as follows:

• $(1,2),(8,7),(5,6,9,10),(4,3)$
• $(1,2),(8,7),(5),(4,3),(6,9,10)$
• $(1),(8,7),(5),(4,3),(6,9,10),(2)$

The length of the sequence numbered $i$ after the $i$-th operation for $i=1,2,\ldots,5$ is $6,4,2,3,1$. Print each of these in its own line.

Sample Input 2

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

Sample Output 2

8
8
8
0
0

The operations may create empty sequences.

Sample Input 3

30
20 6 13 11 29 30 9 10 16 5 8 25 1 19 12 18 7 2 4 27 3 22 23 24 28 21 14 26 15 17
10
1 0 22
1 0 21
2 0 15
1 0 9
1 3 6
2 3 18
1 6 2
1 0 1
2 5 20
2 7 26

Sample Output 3

8
1
8
4
2
5
3
8
1
1

update @ 2024/3/10 01:47:09