#include <iostream>
#include <fstream>

using namespace std;

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

int aib[100001];
int n;

int query(int x)
{
    int sol=0;
    for(int i=x;i>0;i=(i&(i-1)))
    {
        sol+=aib[i];
    }
    return sol;
}

void update(int x,int y)
{
    for(int i=x;i<=n;i=2*i-(i&(i-1)))
    {
        aib[i]+=y;
    }

}

int caut(int s)
{
    int st,dr,m,sum,sol;
    st=1; dr=n; sol=-1;
    while(st<=dr)
    {
        m=(st+dr)/2;
        sum=query(m);
        if(sum==s)
        {
            sol=m;
            dr=m-1;
            break;

        }
        else if(sum>=s)
            dr=m-1;
        else
            st=m+1;
    }
    return sol;
}

int main()
{
    int m;
    in>>n>>m;

    for(int i=1;i<=n;i++)
    {
        in>>aib[i];
        aib[i]+=query(i-1)-query(i&(i-1));
    }

    for(int i=1;i<=m;i++)
    {
        int op;
        in>>op;
        if(op==0)
        {
            int x,y;
            in>>x>>y;
            update(x,y);
        }
        else if(op==1)
        {
            int x,y;
            in>>x>>y;
            out<<query(y)-query(x-1)<<'\n';
        }
        else
        {
            int x;
            in>>x;
            out<<caut(x)<<'\n';
        }
    }

}