#include <bits/stdc++.h>
#define LSB(x) ((-x) & x)
using namespace std;
ifstream in("aib.in");
ofstream out("aib.out");
int n, aib[100010], a, b, m, x, q;
void update(int x, int val)
{
    for(int i = x;i <= n;i += LSB(i))
        aib[i] += val;
}
int sum(int x)
{
    int s = 0;
    for(int i = x;i > 0;i -= LSB(i))
        s += aib[i];
    return s;
}
int cbin(int x)
{
    int st = 1, dr = n, Sum = 0;
    while(st <= dr)
    {
        int mij = (st + dr) / 2;
        Sum = sum(mij);
        if(Sum == x) return mij;
        if(Sum > x) dr = mij - 1;
        else st = mij + 1;
    }
    return -1;
}
int main()
{
    in >> n >> m;
    for(int i = 1;i <= n;i++)
    {
        in >> x;
        update(i, x);
    }
    for(int i = 1;i <= m;i++)
    {
        in >> q;
        if(q == 0)
        {
            in >> a >> b;
            update(a, b);
        }
        if(q == 1)
        {
            in >> a >> b;
            out << sum(b) - sum(a - 1) << '\n';
        }
        if(q == 2)
        {
            in >> a;
            out << cbin(a) << '\n';
        }
    }
    return 0;
}