#include <bits/stdc++.h>
#define nMax 100005
#define lsb(x) ((-x)&x)

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

int n, m, aib[nMax];

void update(int k, int x)
{
    for(int i=k; i<=n; i+=lsb(i))
        aib[i]+=x;
}

int sum(int k)
{
    int s=0;
    for(int i=k; i>=1; i-=lsb(i))
        s+=aib[i];
    return s;
}

int src(int x)
{
    int l=1, r=n;
    while(l<=r)
    {
        int mid=(l+r)>>1;
        int s=sum(mid);
        if(s==x)
            return mid;
        else if(s<x)
            l=mid+1;
        else
            r=mid-1;
    }
    return -1;
}

int main()
{
    fin >> n >> m;
    for(int i=1; i<=n; i++)
    {
        int x;
        fin >> x;
        update(i, x);
    }
    while(m--)
    {
        int t, a, b;
        fin >> t >> a;
        switch(t)
        {
            case 0:
                fin >> b;
                update(a, b);
                break;
            case 1:
                fin >> b;
                fout << sum(b)-sum(a-1) << "\n";
                break;
            case 2:
                fout << src(a) << "\n";
                break;
            default:
                break;
        }
    }
    return 0;
}