include[HTML_REMOVED]
using namespace std;
const int N=100010;
int main()
{
int s[N],a[N];
int n,m;
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;
}
}