#include <stdio.h>
#define nmax 100000
#define dim 10000
using namespace std;
FILE *fin=fopen("aib.in","r");
FILE *fout=fopen("aib.out","w");
int n,m,aib[nmax+5],poz;
char buffer[dim];
void read(int &x)
{
    x=0;
    while(buffer[poz]<'0' || buffer[poz]>'9')
        if(++poz==dim)
        fread(buffer,1,dim,fin),poz=0;
    while(buffer[poz]>='0' && buffer[poz]<='9')
    {
        x=x*10+buffer[poz]-'0';
        if(++poz==dim)
        fread(buffer,1,dim,fin),poz=0;
    }
}
void update(int poz,int val)
{
    while(poz<=n)
    {
        aib[poz]+=val;
        poz+=poz&(-poz);
    }
}
int querry(int poz)
{
    int s=0;
    while(poz>0)
    {
        s+=aib[poz];
        poz-=poz&(-poz);
    }
    return s;
}
int kth(int s)
{
    int p=1;
    while(p<n)p<<=1;
    for(int i=0;p>0;p>>=1)
    if(i+p<=n)
    {
        if(s>=aib[i+p])
        {
            s-=aib[i+p];
            i+=p;
            if(!s)
                return i;
        }
    }
    return -1;
}
int main()
{
    int x,y,z;
    read(n);
    read(m);
    for(int i=1;i<=n;i++)
    {
        read(x);
        update(i,x);
    }
    for(int i=1;i<=m;i++)
    {
        read(z);
        switch(z)
        {
        case 0:
            read(x);
            read(y);
            update(x,y);
            break;
        case 1:
            read(x);
            read(y);
            fprintf(fout,"%d\n",querry(y)-querry(x-1));
            break;
        case 2:
            read(x);
            fprintf(fout,"%d\n",kth(x));
        }
    }
    return 0;
}