#include <bits/stdc++.h>

using namespace std;

ifstream fin("aib.in");
ofstream fout("aib.out");

int n, m;
int aib[100005];
int lsb(int x)
{
    return(x & (-x));
}

void Update(int poz, int val)
{
    for(int i = poz;i <= n;i += lsb(i))
        aib[i] += val;
}

int Query(int poz)
{
    int sum = 0;
    for(int i = poz;i >= 1;i -= lsb(i))
        sum += aib[i];
    return sum;
}

int CautBin(int a)
{
    int left = 1, right = n, mid, ans = -1;
    while(left <= right)
    {
        mid = (left + right) / 2;
        if(Query(mid) >= a)
        {
            ans = mid;
            right = mid - 1;
        }
        else
            left = mid + 1;
    }
    if(ans != 1 && Query(ans) != a)
        ans = -1;
    return ans;
}

int main()
{
    int i;
    fin >> n >> m;
    for(i = 1;i <= n;i++)
    {
        int x;
        fin >> x;
        Update(i, x);
    }
    for(i = 1;i <= m;i++)
    {
        int op, x, y;
        fin >> op;
        if(op == 0)
        {
            fin >> x >> y;
            Update(x, y);
        }
        else if(op == 1)
        {
            fin >> x >> y;
            fout << Query(y) - Query(x - 1) << "\n";
        }
        else
        {
            fin >> x;
            fout << CautBin(x) << "\n";
        }
    }
    return 0;
}