#include <iostream>
#include <fstream>
#include <vector>

using namespace std;

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

const int N = 100005;

int n, m;
vector <int> arb(N, 0);

void Plus(int poz, int val)
{
    while(poz <= n)
    {
        arb[poz] += val;
        poz += (poz^(poz-1)) & poz;
    }
}

int Sum(int poz)
{
    int s = 0;
    while(poz)
    {
        s += arb[poz];
        poz -= (poz^(poz-1)) & poz;
    }
    return s;
}

int Cb(int x)
{
    int st = 0, dr = n, m, val;
    while(dr - st > 1)
    {
        m = (dr + st) >> 1;
        val = Sum(m);

        if(val == x) return m;

        if(val < x) st = m;
        else dr = m;
    }
    if(Sum(dr) == x) return dr;
    return -1;
}

int main()
{
    fin>>n>>m;
    for(int i=1; i<=n; i++)
    {
        int x;
        fin>>x;
        Plus(i, x);
    }

    while(m--)
    {
        int cod, a, b;
        fin>>cod;
        if(!cod)
        {
            fin>>a>>b;
            Plus(a, b);
        }
        else if(cod == 1)
        {
            fin>>a>>b;
            fout<<Sum(b) - Sum(a-1)<<'\n';
        }
        else
        {
            fin>>a;
            fout<<Cb(a)<<'\n';
        }
    }

    return 0;
}