C :

#include"stdio.h"
int main()
{
    int N,M;
    scanf("%d %d",&N,&M);
    int an[N],i;
    for(i=0;i<N;i++)
        scanf("%d",&an[i]);
    while(M--)
    {
        int a,b,s=0;
        scanf("%d%d",&a,&b);
        for(i=a-1;i<b;i++)
            s=s+an[i];
        printf("%d\n",s);
    }
    return 0;
}

C++ :

#include<stdio.h>
int main()
{
int N,M,i,a[105],m,n;
scanf("%d%d",&N,&M);
for(i=1;i<=N;i++)
scanf("%d",&a[i]);
while(M--)
{ int sum=0;
scanf("%d%d",&m,&n);
for(i=m;i<=n;i++)
   sum+=a[i];

printf("%d\n",sum);
}
return 0;
}

Pascal :

var q,w,e,r,t:longint;
      a:array[1..1000000] of longint;
	  b,c,d:array[1..100000]of longint;
begin
    read(q,w);
	for e:=1 to q do
	read(a[e]);
	for e:=1 to w do
	read(b[e],c[e]);
	for e:=1 to w do
	for r:=b[e] to c[e] do
	d[e]:=d[e]+a[r];
	for e:=1 to w do
	writeln(d[e]);
end. 

Java :

import java.util.Scanner;
public class Main
{
	static Scanner sc=new Scanner(System.in);
	static int N=sc.nextInt();
	static int M=sc.nextInt();
	static int arr[]=new int[N+1];
	public static void main(String[] args)
	{
		for(int i=1;i<N+1;i++)
		{
			arr[i]=sc.nextInt();
		}
		arr[0]=-1;
		getSum(M);
	}
	public static void getSum(int a)
	{
		while(a-->0)
		{
			int m=sc.nextInt();
			int n=sc.nextInt();
			int sum=0;
			for(int i=m;i<=n;i++)
			{
				sum+=arr[i];
			}
			System.out.println(sum);
		}
	}
}