Promo

Description:

Input:

The first line contains two integers $$$n$$$ and $$$q$$$ ($$$1 \le n, q \le 2 \cdot 10^5$$$) — the number of items in the store and the number of queries, respectively.

The second line contains $$$n$$$ integers $$$p_1, p_2, \dots, p_n$$$ ($$$1 \le p_i \le 10^6$$$), where $$$p_i$$$ — the price of the $$$i$$$-th item.

The following $$$q$$$ lines contain two integers $$$x_i$$$ and $$$y_i$$$ each ($$$1 \le y_i \le x_i \le n$$$) — the values of the parameters $$$x$$$ and $$$y$$$ in the $$$i$$$-th query.

Output:

For each query, print a single integer — the maximum total value of items received for free for one purchase.

Sample Input:

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

Sample Output:

8
5
6

Note:

In the first query, a customer can buy three items worth $$$5, 3, 5$$$, the two cheapest of them are $$$3 + 5 = 8$$$.

In the second query, a customer can buy two items worth $$$5$$$ and $$$5$$$, the cheapest of them is $$$5$$$.

In the third query, a customer has to buy all the items to receive the three cheapest of them for free; their total price is $$$1 + 2 + 3 = 6$$$.