#include <fstream>
#include <vector>
using namespace std;
ifstream fin("aib.in");
ofstream fout("aib.out");
int n, m, i, j, a, b, c;
vector <int> aib;
void update (int pos, int val)
{
    for (int i = pos; i <= n; i += i&(-i))
        aib[i] += val;
}
int query (int pos)
{
    int sum = 0;
    for (int i = pos; i > 0; i -= i&(-i))
        sum += aib[i];
    return sum;
}
int where (int val)
{
    int pos = 1, cp = 0;
    while (pos < n)
        pos *= 2;
    for (; pos > 0; pos /= 2)
    {
        if (cp+pos <= n && val >= aib[cp+pos])
        {
            cp += pos;
            val -= aib[cp];
            if (val == 0) return cp;
        }
    }
    return -1;
}
int main()
{
    fin >> n >> m; aib.resize(n+1);
    for (i = 1; i <= n; i++)
    {
        fin >> a;
        update(i, a);
    }
    for (i = 1; i <= m; i++)
    {
        fin >> c >> a;
        if (c == 0)
        {
            fin >> b;
            update(a, b);
        }
        if (c == 1)
        {
            fin >> b;
            fout << query(b)-query(a-1) << '\n';
        }
        if (c == 2)
        {
            fout << where(a) <<'\n';
        }
    }
    return 0;
}