#include <cstdio>
#define Max 100001

int n,a[Max];

void update(int idx,int val)
{
    while(idx<=n)
    {
        a[idx]+=val;
        idx+=idx&-idx;
    }
}

int read(int idx)
{
    int sum=0;
    while(idx>0)
    {
        sum+=a[idx];
        idx-=idx&-idx;
    }
    return sum;
}

int c_bin(int x)
{
    int l=1,r=n,m;
    while(l<r)
    {
        m=(l+r)/2;
        if(read(m)>=x)r=m; else l=m+1;
    }
    return read(r)==x?r:-1;
}

int main()
{
    int m,c,x,y;
    freopen("aib.in","r",stdin);
    freopen("aib.out","w",stdout);
        scanf("%d %d",&n,&m);
        for(int i=1;i<=n;i++)
        {
            scanf("%d",&y);
            update(i,y);
        }
        while(m--)
        {
            scanf("%d",&c);
            switch(c)
            {
                case 0: scanf("%d %d",&x,&y); update(x,y); break;
                case 1: scanf("%d %d",&x,&y); printf("%d\n",read(y)-read(x-1)); break;
                case 2: scanf("%d",&x); printf("%d\n",c_bin(x)); break;
            }
        }
    return 0;
}