#include <fstream>
#define zeros(x) ( (x ^ (x - 1)) & x )

using namespace std;

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

int n,k;
int vect[100005];

void Add(int pos,int x)
{
    for(int i = pos; i <= n; i += zeros(i))
        vect[i]+=x;
}

int Compute(int x)
{
    int i, ret = 0;

    for (i = x; i > 0; i -= zeros(i))
    {
        ret += vect[i];
    }
    return ret;
}

int binSearch(int sum)
{
    int st = 1,dr = n, mij,s;

    while(st <= dr)
    {
        mij = (st +dr) / 2;

        s = Compute(mij);

        if(s < sum)
        {
            st = mij + 1;
        }
        else
        {
            dr = mij - 1;
        }
    }


    if(Compute(st) == sum)
        return st;
    else
        return -1;
}
int x,a,b;
int tp;
int main()
{
    f>>n>>k;

    for(int i = 1; i <= n; i++)
    {
        f>>x;
        Add(i,x);
    }

    for(int i = 1; i <= k; i++)
    {
        f>>tp;

        if(tp==0)
        {
            f>>a>>b;
            Add(a,b);
        }
        else if(tp==1)
        {
            f>>a>>b;
            g<<Compute(b)- Compute(a-1)<<"\n";
        }
        else if(tp==2)
        {
            f>>a;
            g<<binSearch(a)<<"\n";
        }

    }

    f.close();
    g.close();
    return 0;
}