#include<cstdio>
using namespace std;
int aib[100001],n;
int putere(int x)
{
    return (x^(x-1))&x;
}

void add(int x,int c)
{
    for(int i=x;i<=n;i+=putere(i))
    {
        aib[i]+=c;
    }
}

int calc(int x)
{
    int rez=0;
    for(int i=x;i>0;i-=putere(i))
    {
        rez+=aib[i];
    }
    return rez;
}

int main()
{
    freopen("aib.in","r",stdin);
    freopen("aib.out","w",stdout);
    int m,i,x,y,t,med,j;
    scanf("%d%d",&n,&m);
    for(i=1;i<=n;++i)
    {
        scanf("%d",&x);
        add(i,x);
    }
    for(i=1;i<=m;++i)
    {
        scanf("%d%d",&t,&x);
        if(t!=2)
        {
            scanf("%d",&y);
            if(!t)
                add(x,y);
            else
                printf("%d\n",calc(y)-calc(x-1));
        }
        else
        {
            bool ok=0;
            for(med=1;med<n;med*=2);
            for(j=0;med;med/=2)
            {
                if(j+med<=n&&x>=aib[j+med])
                {
                    x-=aib[j+med];
                    j+=med;
                    if(!x)
                    {
                        ok=1;
                        printf("%d\n",j);
                        break;
                    }
                }
            }
            if(!ok)
                printf("-1\n");
        }
    }
    return 0;
}