n11659.java

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.StringTokenizer;

public class n11659 {
    public static void main(String []args) throws IOException{
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        StringTokenizer st = new StringTokenizer(br.readLine());
        int n = Integer.parseInt(st.nextToken());
        int m = Integer.parseInt(st.nextToken());
        int[] arr = new int[n+1];
        st = new StringTokenizer(br.readLine());
        for(int i=1;i<=n;i++)
            arr[i] = arr[i-1] + Integer.parseInt(st.nextToken());
        for(int i=0;i<m;i++) {
            st = new StringTokenizer(br.readLine());
            int a = Integer.parseInt(st.nextToken());
            int b = Integer.parseInt(st.nextToken());
            
            System.out.println(arr[b]-arr[a-1]);
        }
    }
}