#include <iostream>
#include <fstream>
using namespace std;
int n, aib[100005];
ifstream fin("aib.in");
ofstream fout("aib.out");

void Update(int p, int x)
{
    while(p <= n)
    {
        aib[p] += x;
        p += (p & (-p));
    }
}

int Suma(int p)
{
    int s = 0;
    while(p > 0)
    {
        s += aib[p];
        p -= (p & (-p));
    }
    return s;
}
/// cauta cea mai din stanga pozitie poz suma a[1] + ... a[poz] = s
int CautBin(int p, int s)
{
    int st, dr, poz , mij;
    int suma;
    st = 1; dr = p; poz = -1;
    while(st <= dr)
    {
        mij = (st + dr) / 2;
        suma = Suma(mij);
        if(suma == s)
        {
            poz = mij;
            dr = mij - 1;
        }
        else if(suma > s) dr = mij - 1;
        else st = mij + 1;
    }
   return poz;
}

int main()
{
    int i, m, x;
    fin >> n >> m;
    for(int i = 1; i <= n; i++)
        {
            fin >> x;
            Update(i, x);
        }
    int op, a, b;
    while(m--)
    {
        fin >> op;
        if(op == 0)
        {
            fin >> a >> b;
            Update(a, b);
        }
        else if(op == 1)
        {
            fin >> a >> b;
                fout << (Suma(b) - Suma(a-1)) << "\n";

        }
        else
        {
            fin >> a;
            fout << CautBin(n ,a) << "\n";
        }
    }
    return 0;
}