#include <iostream>
#include <fstream>
#define zeros(x) ((x ^ (x-1)) & x)
using namespace std;
ifstream f("aib.in");
ofstream g("aib.out");
int n,k,aib[100001],v[100001],type,a,b;
void adauga (int x,int val)
{
    for (int i=x; i<=n; i+=zeros(i))
    {
        aib[i]+=val;
    }
}
int sum1x (int x)
{
    int total=0;
    for (int i=x; i>0; i-=zeros(i))
    {
        total+=aib[i];
    }
    return total;
}
int query (int a)
{
    int li=1,ls=n,lm,save=-1,ok=0;
    while (li<=ls && ok==0)
    {

        lm=(li+ls)/2;
//cout<<li<<' '<<ls<<' '<<lm<<' '<<sum1x(lm)<<'\n';
        if (sum1x(lm)<a)
        {
            li=lm+1;
        }
        else if (sum1x(lm)==a)
        {
            ok=1;
            save=lm;
        }
        else ls=lm-1;
    }
   /* lm=(li+ls)/2;
    if (sum1x(lm)==a)
        save=lm;*/
    return save;
}
int main()
{
    f>>n>>k;
    for (int i=1; i<=n; i++)
    {
        f>>v[i];
        adauga(i,v[i]);
    }
    for (int i=1; i<=k; i++)
    {
        f>>type;
        if (type==0)
        {
            f>>a>>b;
            adauga(a,b);
        }
        else if (type==1)
        {
            f>>a>>b;
            g<<sum1x(b)-sum1x(a-1)<<'\n';
        }
        else
        {
            f>>a;
            g<<query(a)<<'\n';
        }
    }
    return 0;
}