Prep 4

It was a peaceful day in the life of a student, when suddenly Timothy Li messages you about some strange anime called Date a Live. There are ~N~ episodes in the series, and each episode ~i~ has a rating ~k_i~ from 1 to 10. Being super bored, you decide to give it a try. Unfortunately, you cannot live without food through the entire afternoon and the anime streamer you are using does not have a pause button for some reason. Thus, to make an intelligent decision on when to go make food, you have ~Q~ queries in the form ~a~ ~b~. For each of these queries, you will simulate skipping episodes ~a~ to ~b~ (inclusive), and output the sum of the ratings of the episodes you do not skip.

Input Specification

The first line of input contains 2 integers, space separated — ~N, Q~.

The next line contains ~N~ integers, space separated. The ~i^{th}~ of these integers represents the rating of the ~i^{th}~ episode.

The next ~Q~ lines will contain integers ~a_i~ and ~b_i~, the episodes that are skipped.

Output Specification

For each query, output one integer, the sum specified in the problem statement.

Constraints

~1 \le N, Q \le 500\,000~

~1 \le k_i \le 10~

~1 \le a \le b \le N~

Sample Input

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

Sample Output

29
26
0

Explanation of Output for Sample Input

For the first query, the first three episodes will be skipped, so the total rating is ~8+3+4+5+6+1+2 = 29~.