#include <fstream>

using namespace std;

int BIT[100010];

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

int getSum(int index)
{
    int sum = 0;
    index = index + 1;
    while(index)
    {
        sum += BIT[index];
        index -= index &(-index);
    }
    return sum;
}

void update(int index, int val, int n)
{
    index = index + 1;
    while(index <= n)
    {
        BIT[index] += val;
        index += index & (-index);
    }
}

int caut_bin(int s, int d, int value)
{
    int mij, val;
    if(s > d)
        return -1;
    mij = (s+d)/2;
    val = getSum(mij-1);
    if(value == val)
        return mij;
    else
    {
        if(value < val)
            return caut_bin(s, mij-1, value);
        else
            return caut_bin(mij+1, d, value);
    }
}

int main()
{
    int n, i, m, val, c, a, b, ok, j;
    f >> n >> m;
    for(i = 0; i < n; i++)
    {
        f >> val;
        update(i, val, n);
    }
    for(i = 0 ; i < m; i++)
    {
        f >> c;
        if(c == 0)
        {
            f >> a >> b;
            update(a-1, b, n);
        }
        if(c == 1)
        {
            f >> a >> b;
            g << (getSum(b-1) - getSum(a-2)) << '\n';
        }
        if(c == 2)
        {
            f >> a;
            ok = caut_bin(1, n, a);
            g << ok << '\n';
        }
    }
}