include [HTML_REMOVED]

using namespace std;

const int N=100010;
int a[N],b[N];
int main(){
int n,m;
scanf(“%d %d”,&n,&m);
for(int i=1;i<=n;i)
scanf(“%d”,&a[i]);
for(int i=1;i<=n;i)
b[i]=b[i-1]+a[i];
while(m–){
int l,r;
scanf(“%d%d”,&l,&r);
printf(“%d\n”,b[r]-b[l-1]);
}
return 0;
}