#include <bits/stdc++.h>
using namespace std;

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

int n, Q;
int aib[100005];

void Update(int p, int val)
{
    while (p <= n)
    {
        aib[p] += val;
        p += (p & (-p));
    }
}
int Query(int p)
{
    int suma = 0;
    while (p >= 1)
    {
        suma += aib[p];
        p -= (p & (-p));
    }
    return suma;
}

int CautBin(int val)
{
    int st, dr, mij, suma, P;
    st = 1; dr = n; P = -1;
    while (st <= dr)
    {
        mij = (st + dr) / 2;
        suma = Query(mij);
        if (suma == val) P = mij;
        if (suma >= val) dr = mij - 1;
        else st = mij + 1;
    }
    return P;
}

int main()
{
    int op, x, y;
    fin >> n >> Q;
    for (int i = 1; i <= n; i++)
    {
        fin >> x;
        Update(i, x);
    }

    while (Q--)
    {
        fin >> op;
        if (op == 0)
        {
            fin >> x >> y;
            Update(x, y);
        }
        else if (op == 1)
        {
            fin >> x >> y;
            fout << Query(y) - Query(x - 1) << "\n";
        }
        else
        {
            fin >> x;
            fout << CautBin(x) << "\n";
        }
    }
    return 0;
}