#include <fstream>

using namespace std;
ifstream cin("aib.in");
ofstream cout("aib.out");
int aib[100001], n, m, ce,a,b;

void update(int p, int x)
{
    for (int i = p; i <= n; i += (i & -i))
        aib[i] += x;
}

int query(int p)
{
    int s = 0;
    for (int i = p; i >= 1; i -= (i & -i))
        s += aib[i];
    return s;
}

int cb(int k)
{
    int poz = -1, st = 1, dr = n,mid,aux;
    while (st <= dr)
    {
        mid = (st + dr) / 2;
        aux = query(mid);
        if (aux == k)
        {
            poz = mid;
            dr = mid - 1;
        }
        else
            if (aux > k)
                dr = mid - 1;
            else
                st = mid + 1;


    }
    return poz;
}
int main()
{
    cin >> n >> m;
    for (int i = 1; i <= n; i++)
    {
        cin >> a;
        update(i, a);
    }
    for (int i = 1; i <= m; i++)
    {
        cin >> ce;
        if (ce == 0)
        {
            cin >> a >> b;
            update(a, b);
        }
        else
            if (ce == 1)
            {
                cin >> a >> b;
                cout << query(b) - query(a - 1) << '\n';
           }
            else
                if (ce == 2)
                {
                    cin >> a;
                    cout << cb(a) << '\n';
                }
    }

    return 0;
}