#include <fstream>

#define ub(x) (x & (-x))

using namespace std;

ifstream f("aib.in");
ofstream g("aib.out");

int n, m, i, c, x, a, b, aib[100010];

void Add(int x, int val)
{
    for (int i = x; i <= n; i += ub(i))
        aib[i] += val;
}

int Suma(int x)
{
    int sum = 0;
    for (int i = x; i >= 1; i -= ub(i))
        sum += aib[i];
    return sum;
}

int Cauta(int x)
{
    int st = 1, dr = n, poz = 0;
    while (st <= dr)
    {
        int m = (st + dr) / 2;
        int val = Suma(m);
        if (val >= x)
            poz = m, dr = m - 1;
        else
            st = m + 1;
    }
    if (Suma(poz) == x)
        return poz;
    return -1;
}

int main()
{
    ios::sync_with_stdio(false);
    f.tie(0), g.tie(0);
    f >> n >> m;
    for (i = 1; i <= n; ++i)
    {
        f >> x;
        Add(i, x);
    }
    for (i = 1; i <= m; ++i)
    {
        f >> c;
        if (c == 0)
        {
            f >> a >> b;
            Add(a, b);
        }
        else
        if (c == 1)
        {
            f >> a >> b;
            g << Suma(b) - Suma(a - 1) << '\n';
        }
        else
        if (c == 2)
        {
            f >> a;
            g << Cauta(a) << '\n';
        }
    }
    return 0;
}