include[HTML_REMOVED]
using namespace std;
const int N = 1000010;
int s[N];
int main()
{
int a,n,m;
cin>>n>>m;
for(int i=1;i<=n;i++)
cin>>a,s[i]=s[i-1]+a;
while(m–)
{
int l,r;
cin>>l>>r;
cout<<s[r]-s[l-1]<<endl;
}
}