#include <bits/stdc++.h>

using namespace std;
ifstream f("aib.in");
ofstream g("aib.out");
int n,m,c,x,y,a[100001];
void aduna(int p,int y)
{
    for(;p<=n;p+=p&(-p))
        a[p]+=y;
}
int suma(int p)
{
    int s=0;
    for(;p;p-=p&(-p))
        s+=a[p];
    return s;
}
int cauta(int a)
{
    int sum=suma(1);
    int hi,lo,mid;
    while(lo<=hi)
    {
        mid=(lo+hi)/2;
        if(sum>suma(mid))
            lo=mid-1;
        else if(sum<suma(mid))
            hi=mid-1;
        else
            return mid;
    }
    return -1;
}

int main()
{
    f>>n>>m;
    for(int i=1;i<=n;i++)
        f>>a[i];
    for(int i=1;i<=m;i++)
    {
        f>>c>>x>>y;
        if(c==0)
        {
            aduna(x,y);
        }
        else if(c==1)
        {
            g<<suma(y)-suma(x-1)<<'\n';
        }
        else
        {
            g<<cauta(x)<<'\n';
        }
    }
    return 0;
}