Score : $400$ points

问题描述

你得到一个长度为 $N$ 的序列：$A=(A_1,\ldots,A_N)$。

按照以下格式回答 $Q$ 个查询。

• 给定整数 $L$，$R$ 和 $X$。找出 $A_L, \ldots, A_R$ 中值等于 $X$ 的元素的数量。

以上为通义千问 qwen-max 翻译，仅供参考。

Problem Statement

You are given a sequence of length $N$: $A=(A_1,\ldots,A_N)$.

Answer $Q$ queries given in the following format.

• You are given integers $L$, $R$, and $X$. Find the number of elements among $A_L, \ldots, A_R$ whose values are equal to $X$.

Constraints

• $1 \leq N \leq 2\times 10^5$
• $1 \leq A_i \leq N$
• $1 \leq Q \leq 2\times 10^5$
• $1\le L \leq R \leq N, 1 \leq X \leq N$, for each query.
• All values in input are integers.

Input

Input is given from Standard Input in the following format:

$N$

$A_1$ $A_2$ $\ldots$ $A_N$

$Q$

$\mathrm{Query}_1$

$\mathrm{Query}_2$

$\vdots$

$\mathrm{Query}_Q$

Here, $\mathrm{Query}_i$ represents the $i$-th query.

Each query is in the following format:

$L$ $R$ $X$

Output

Print $Q$ lines, the $i$-th of which contains the answer to the $i$-th query.

Sample Input 1

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

Sample Output 1

2
0
0
1

In the first query, two of $(A_1,A_2,A_3,A_4,A_5) =(3,1,4,1,5)$ have values equal to $1$.

In the second query, zero of $(A_2,A_3,A_4) =(1,4,1)$ have values equal to $3$.

update @ 2024/3/10 10:37:05