include [HTML_REMOVED]
using namespace std;
const int N = 100010;
int main()
{
int n,m;
int a[N],s[N] ;
cin>>n>>m;
for(int i =1;i <= n;i) cin>>a[i];
for(int i =1;i <= n;i) s[i]= s[i-1] +a[i];
while(m–)
{
int l,r;
cin>>l>>r;
cout<<s[r] - s[l-1]<<endl;
}
}