#include <bits/stdc++.h>
#define mp make_pair
#define pb push_back
#define INF numeric_limits<int>::max()
#define int64 long long
#define lsb(x) (-x)&(x)
using namespace std;
ifstream in("aib.in");
ofstream out("aib.out");
vector<int> bit;
int n;
void update(int pos,int val)
{
    for(int i=pos;i<=n;i+=lsb(i))
        bit[i]+=val;
}
int sum(int pos)
{
    int s=0;
    for(int i=pos;i>0;i-=lsb(i))
        s+=bit[i];
    return s;
}
int bin_search(int val)
{
    int left=1,right=n;
    while(left<=right)
    {
        int mid=(left+right)/2;
        if(sum(mid)==val)
            return mid;
        if(sum(mid)>val)
            right=mid-1;
        else
            left=mid+1;
    }
    return -1;
}
int main()
{
    int Q;
    in>>n>>Q;
    bit=vector<int> (n+1);
    for(int i=1;i<=n;i++)
    {
        int x;
        in>>x;
        update(i,x);
    }
    for(;Q;Q--)
    {
        int t,x,y;
        in>>t;
        if(t==0)
        {
            in>>x>>y;
            update(x,y);
        }
        else if(t==1)
        {
            in>>x>>y;
            out<<sum(y)-sum(x-1)<<'\n';
        }
        else{
            in>>x;
            out<<bin_search(x)<<'\n';
        }
    }
    return 0;
}