#include <bits/stdc++.h>
#define inf 2000000
using namespace std;
#define cin fin
#define cout fout
ifstream cin("aib.in");
ofstream cout("aib.out");

int n, a, b, q, x, y, op, aib[200000];

void update(int poz, int val)
{
    for(int i=poz; i<=n; i+=(i&(-i)))
        aib[i]+=val;
}

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

int caut(int target)
{
    int st=1, dr=n;
    while(st<=dr)
    {
        int mid=(st+dr)/2;
        if(query(mid)>target)
            dr=mid-1;
        else if(query(mid)<target)
            st=mid+1;
        else
            return mid;
    }
    return -1;
}


signed main()
{
    cin>>n>>q;
    for(int i=1; i<=n; i++)
    {
        cin>>x;
        update(i,x);
    }
    while(q--)
    {
        cin>>op;
        if(op==1)
        {
            cin>>a>>b;
            cout<<query(b)-query(a-1)<<'\n';
        }
        else if(op==0)
        {
            cin>>a>>b;
            update(a,b);
        }
        else if(op==2)
        {
            cin>>a;
            cout<<caut(a)<<'\n';
        }
    }
}