CF1824D.LuoTianyi and the Function

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题目描述

LuoTianyi gives you an array $a$ of $n$ integers and the index begins from $1$ .

Define $g(i,j)$ as follows:

$g(i,j)$ is the largest integer $x$ that satisfies $\{a_p:i\le p\le j\}\subseteq\{a_q:x\le q\le j\}$ while $i \le j$ ;
and $g(i,j)=0$ while $i>j$ .

There are $q$ queries. For each query you are given four integers $l,r,x,y$ , you need to calculate $\sum\limits_{i=l}^{r}\sum\limits_{j=x}^{y}g(i,j)$ .

输入格式

The first line contains two integers $n$ and $q$ ( $1\le n,q\le 10^6$ ) — the length of the array $a$ and the number of queries.

The second line contains $n$ integers $a_1,a_2,\ldots,a_n$ ( $1\le a_i\le n$ ) — the elements of the array $a$ .

Next $q$ lines describe a query. The $i$ -th line contains four integers $l,r,x,y$ ( $1\le l\le r\le n, 1\le x\le y\le n$ ) — the integers in the $i$ -th query.

输出格式

Print $q$ lines where $i$ -th line contains one integer — the answer for the $i$ -th query.

输入输出样例

输入#1

6 4
1 2 2 1 3 4
1 1 4 5
2 3 3 3
3 6 1 2
6 6 6 6

输出#1

输入#2

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

输出#2

说明/提示

In the first example:

In the first query, the answer is $g(1,4)+g(1,5)=3+3=6$ .

$x=1,2,3$ can satisfies $\{a_p:1\le p\le 4\}\subseteq\{a_q:x\le q\le 4\}$ , $3$ is the largest integer so $g(1,4)=3$ .

In the second query, the answer is $g(2,3)+g(3,3)=3+3=6$ .

In the third query, the answer is $0$ , because all $i > j$ and $g(i,j)=0$ .

In the fourth query, the answer is $g(6,6)=6$ .

In the second example:

In the second query, the answer is $g(2,3)=2$ .

In the fourth query, the answer is $g(1,4)+g(1,5)=2+2=4$ .

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