#include <iostream>
#include <fstream>

using namespace std;

int x, i, j, n, m, act, a, b, st, dr, mid;
int aib[100001];

ifstream f("aib.in");
ofstream g("aib.out");

void add(int p, int x)
{
    for (i=p; i<=n; i+=(p&(-p))) aib[i]+=x;
}
int sum(int p)
{
    int s=0;
    for (i=p; i>0; i-=(p&(-p))) s+=aib[p];
    return s;
}

int main()
{
    f>>n>>m;
    for (i=1; i<=n; i++)
    {
        f>>x;
        add(i, x);
    }
    //for (i=1; i<=n; i++)
      //  g<<aib[i]<<" ";
    for (i=1; i<=m; i++)
    {
        f>>act;
        if (act==0)
        {
            f>>a>>b;
            add (a, b);
        }
        if (act==1)
        {
            f>>a>>b;
            g<<sum(b)-sum(a-1)<<endl;
        }
        if (act==2)
        {
            st=1;
            dr=n;
            while(st<dr)
        {
                mid=(st+dr)/2;
                if(sum(mid)>=a)
                {
                    dr=mid-1;
                }
                else
                {
                    st=mid+1;
                }
        }
            if(sum(st)==a)
            {
                g<<st<<endl;
            }
            else
            {
                g<<"-1"<<endl;
            }
        }
    }

}