#include <fstream>
const int PTMAX=35;
const int NMAX=100005;

using namespace std;
ifstream fin("rmq.in");
ofstream fout("rmq.out");

int rmq[PTMAX][NMAX];
int i, n, m, putere, j, x, y, gasit;

int pt(int i)
{
    return (1<<i);
}

int cpt(int dif)
{
    int pt=1, i=0;
    while(pt<dif)
    {
        pt*=2;
        i++;
    }
    if(i!=0) return i-1;
    return 0;
}

int main()
{
    fin>>n>>m;
    for(i=1; i<=n; i++) fin>>rmq[0][i];
    for(i=1; (1<<i)<=n; i++)
    {
        for(j=(1<<i); j<=n; j++) rmq[i][j]=rmq[i-1][j-(1<<(i-1))]+rmq[i-1][j];
    }
    for(i=1; i<=m; i++)
    {
        fin>>x>>y;
        gasit=cpt(y-x+1);
        //fout<<gasit<<' ';
        //fout<<gasit<<' '<< a[gasit][y]<<' '<<a[gasit][x+gasit]<<'\n';
        fout<<min(rmq[gasit][y], rmq[gasit][x+pt(gasit)-1]);
        fout<<'\n';
    }
    return 0;
}