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

using namespace std;
ifstream fi("aib.in");
ofstream fo("aib.out");
const int nmax=1e5;
int n, m, pow2=1;
int X[nmax+5], aib[nmax+5];

void update(int pos, int val)
{
    while(pos<=n)
    {
        aib[pos]+=val;
        pos+=LSB(pos);
    }
}

int suma(int pos)
{
    int s=0;
    while(pos)
    {
        s+=aib[pos];
        pos-=LSB(pos);
    }
    return s;
}

int posmin(int val)
{
    int s=0, i, hi=pow2;
    for(i=0; hi && s<val; hi/=2)
        if(s+aib[i+hi]<=val)
        {
            s+=aib[i+hi];
            i+=hi;
        }
    if(s==val)
        return i;
    return -1;
}

int main()
{
    fi>>n>>m;
    for(int i=1; i<=n; i++)
    {
        fi>>X[i];
        update(i, X[i]);
    }

    while(pow2*2<=n)
        pow2*=2;

    while(m--)
    {
        int q, a, b;
        fi>>q>>a;
        if(q==0)
        {
            fi>>b;
            update(a, b);
        }
        else if(q==1)
        {
            fi>>b;
            fo<<suma(b)-suma(a-1)<<"\n";
        }
        else
            fo<<posmin(a)<<"\n";
    }
    fi.close();
    fo.close();
    return 0;
}