#include <fstream>
using namespace std;
ifstream in ("aib.in");
ofstream out ("aib.out");
int aib[100001];
int n, m;
void update (int place, int val)
{
    for (int i = place; i<=n;i += i & (-i))
        aib[i] += val;
}
int qr (int place)
{
    int ans = 0;
    for (int i = place; i>0; i -= (i&-i))
        ans += aib[i];
    return ans;
}
int caut_bin (int value)
{
    int st = 1, dr = n, poz = -1;
    while (st <= dr)
    {
        int mid = (st + dr) / 2;
        int val = qr(mid);
        if (val == value)
        {
            poz = mid;
            dr = mid - 1;
        }
        else if (val < value)
            st = mid + 1;
        else
            dr = mid - 1;
    }
    return poz;
}
int main()
{
    in >> n >> m;
    for (int i = 1;i<=n;++i)
    {
        int val;
        in >> val;
        update (i, val);
    }
    while (m--)
    {
        int type;
        in >> type;
        if (type == 0)
        {
            int place, value;
            in >> place >> value;
            update (place, value);
        }
        else if (type == 1)
        {
            int st, dr;
            in >> st >> dr;
            out << qr(dr) - qr(st - 1) << '\n';
        }
        else
        {
            int val;
            in >> val;
            out << caut_bin (val) << '\n';
        }

    }
    return 0;
}