#include <iostream>
#include <fstream>

using namespace std;

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

const int dim = 100005;

int n,m,aib[dim];

void update(int poz,int val)
{
    while (poz <= n)
    {
        aib[poz] += val;
        poz += poz & (-poz);
    }
}

int query(int dr)
{
    int s = 0;
    while (dr != 0)
    {
        s += aib[dr];
        dr -= dr & (-dr);
    }
    return s;
}

int main()
{
    in >> n >> m;
    int a;
    int log = 1;
    while (log <= n)
    {
        log *= 2;
    }
    log /= 2;
    for (int i=1; i<=n; i++)
    {
        in >> a;
        update(i,a);
    }
    int op,b;
    for (int i=1; i<=m; i++)
    {
        in >> op >> a;
        if (op == 0)
        {
            in >> b;
            update(a,b);
        }
        if (op == 1)
        {
            in >> b;
            out << query(b) - query(a-1) << "\n";
        }
        if (op == 2)
        {
            int baza = 0;
            int off = log,s = 0,ok = 0;
            while (off >= 1 && ok == 0)
            {
                while (baza + off > n)
                {
                    off /= 2;
                }
                s += aib[baza + off];
                if (s < a)
                {
                    baza += off;
                    off /= 2;
                }
                else if (s > a)
                {
                    s -= aib[baza + off];
                    off /= 2;
                }
                else
                {
                    out << baza + off << "\n";
                    ok = 1;
                }
            }
            if (ok == 0)
            {
                out << "-1\n";
            }
        }
    }
    return 0;
}