#include <iostream>
#include <fstream>
#define NMAX 200005
using namespace std;

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

int n,m,x,y;
int aib[NMAX];

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

int sum(int pos)
{
    int sol=0;
    for(int i=pos;i>0;i-=i&(-i))
        sol+=aib[i];
    return sol;
}

int cb(int val)
{
    int st=1,dr=n;
    int sol=NMAX;
    while(st<=dr)
    {
        int mij=(st+dr)/2;
        int suma = sum(mij);
        if(suma==val)
            return mij;
        else if(suma>val)
        {
            dr=mij-1;
        }
        else
            st=mij+1;
    }
    return -1;
}

int main()
{
    fin>>n>>m;
    for(int i=1;i<=n;i++)
    {
        fin>>x;
        update(i,x);
    }
    for(int i=1;i<=m;i++)
    {
        int c;
        fin>>c;
        if(c==0)
        {
            fin>>x>>y;
            update(x,y);
        }
        else if(c==1)
        {
            fin>>x>>y;
            fout<<sum(y)-sum(x-1)<<endl;
        }
        else
        {
            fin>>x;
            fout<<cb(x)<<endl;
        }
    }
}