#include<cstdio>
using namespace std;
int n,m,i,poz,val,a,b,arb[(1<<17)+5],op;
void add(int poz,int val)
{
    for(int i=poz;i<=n;i+=i&(-i)) arb[i]+=val;
}
int sum(int x)
{
    int s=0,i;
    for(i=x;i;i-=i&(-i)) s+=arb[i];
    return s;
}
int query(int x)
{
    int l=1,r=n,m,val;
    while(l<=r)
    {
        m=(l+r)/2; val=sum(m);
        if(val==x) return m;
        if(val<x) l=m+1;
        else r=m-1;
    }
    return -1;
}
int main()
{
    freopen("aib.in","r",stdin);
    freopen("aib.out","w",stdout);
    scanf("%d%d",&n,&m);
    for(i=1;i<=n;i++)
    {
        scanf("%d",&val);
        add(i,val);
    }
    for(;m;m--)
    {
        scanf("%d",&op);
        if(op==0)
        {
            scanf("%d%d",&poz,&val);
            add(poz,val);
            continue;
        }
        if(op==1)
        {
            scanf("%d%d",&a,&b);
            printf("%d\n",sum(b)-sum(a-1));
            continue;
        }
        scanf("%d",&a);
        printf("%d\n",query(a));
    }
    return 0;
}