#include <iostream>
#include <fstream>

using namespace std;

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

int t[100005];

int sum(int p)
{
    int s = 0;
    while(p > 0)
    {
        s += t[p];
        p -= p & (-p);
    }
    return s;
}

void add(int p, int x, int len)
{
    while(p <= len)
    {
        t[p] += x;
        p += p & (-p);
    }
}

int cautareBinara(int st, int dr, int x)
{
    int mij, suma, poz = -1;;
    while(st <= dr)
    {
        mij = (st + dr) / 2;
        suma = sum(mij);
        if(suma == x)
        {
            poz = mij;
            dr = mij - 1;
        }
        if(suma < x) st = mij + 1;
        else dr = mij - 1;
    }
    return poz;
}

int main()
{
    int n, q, op, i, a, b, x;
    fin >> n >> q;
    for(i = 1; i <= n; ++i)
    {
        fin >> x;
        add(i, x, n);
    }
    for(i = 1; i <= q; ++i)
    {
        fin >> op;
        if(op == 0)
        {
            fin >> a >> b;
            add(a, b, n);
        }
        else if(op == 1)
        {
            fin >> a >> b;
            fout << sum(b) - sum(a - 1) << "\n";
        }
        else
        {
            fin >> a;
            fout << cautareBinara(1, n, a) << "\n";
        }
    }
    return 0;
}