#include <fstream>

using namespace std;

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

const int NMAX = 100005;

int aib[NMAX],n;

void update(int x,int val)
{
    for(int i = x;i <= n;i += i & -i)
    {
        aib[i] += val;
    }
}

int query(int x)
{
    int s = 0,i;
    for(i = x;i > 0;i -= i & -i)
        s += aib[i];
    return s;
}

int query2(int a)
{
    int st = 1,dr = n;
    while(st <= dr)
    {
        int mid = st + (dr - st) / 2;
        if(query(mid) == a)
            return mid;
        if(query(mid) < a)
            st = mid + 1;
        else
            dr = mid - 1;
    }
    return -1;
}
int main()
{
    int m,x;
    fin>>n>>m;
    for(int i = 1;i <= n;i++)
    {
        fin>>x;
        update(i,x);
    }
    int t,y;
    for(int i = 1;i <= m;i++)
    {
        fin>>t;
        if(t == 0)
        {
            fin>>x>>y;
            update(x,y);
        }
        if(t == 1)
        {
            fin>>x>>y;
            fout<<query(y) - query(x - 1)<<"\n";
        }
        if(t == 2)
        {
            fin>>x;
            fout<<query2(x)<<"\n";
        }
    }
    return 0;
}