#include <cstdio>
#include<cstring>
#include <iostream>
#include <algorithm>
using namespace std;
const int N=100010;
intn,m;
int a[N];
int s[N];
int main()
{
scanf("%d%d",&n,8m);
for (int i=1;i k= n;i ++)
{scanf("%d”,&a[i]);
s[i] = s[i-1]+a[i];
}
while (m--)
{
intl,r;
scanf(“%d%d",&l,&r);
printf("%d\n",s[r]-s[l- 1]);
}
return 0;
}