#P1824D. LuoTianyi and the Function
LuoTianyi and the Function
Description
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 $\sum\limits_{i=l}^{r}\sum\limits_{j=x}^{y}g(i,j)$.
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.
Print $q$ lines where $i$-th line contains one integer — the answer for the $i$-th query.
Input
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.
Output
Print $q$ lines where $i$-th line contains one integer — the answer for the $i$-th query.
6 4
1 2 2 1 3 4
1 1 4 5
2 3 3 3
3 6 1 2
6 6 6 6
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
6
6
0
6
4
2
6
4
80
Note
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 $g(1,4)+g(1,5)=2+2=4$.