#include<fstream>
using namespace std;
ifstream cin("cuburi2.in");
ofstream cout("cuburi2.out");
int v[250001];
int main()
{
    int n, m, i, x, y, j, pos;
    float med, s1, s2;
    cin>>n>>m;
    for(i=1; i<=n; i++)
        cin>>v[i];
    for(i=1; i<=m; i++)
    {
        cin>>x>>y;
        s1=0;
        s2=0;
        for(j=x; j<=y; j++)
        {
            s1+=v[j]*j;
            s2+=v[j];
        }
        med=s1/s2;
        pos=med+0.5;
        cout<<pos<<" 0"<<'\n';
    }
    return 0;
}