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import java.util.Scanner;
public class Main{
public static void main(String[] args){
Scanner sc =new Scanner(System.in);
int n =sc.nextInt();
int m = sc.nextInt();
int []arr = new int[n];
for (int i = 0; i [HTML_REMOVED]0){
int l = sc.nextInt();
int r = sc.nextInt();
System.out.println(sum[r]-sum[l-1]);
}
}
}
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