#include <stdio.h>
FILE *f=fopen("arbint.in","r"),*g=fopen("arbint.out","w");
int arb[400001],mar[400001],i,j,n,val,x,pos,m,a,b,st,dr,max;
int update(int nod,int x,int y)
{
    if (x==y)
    {
        mar[nod]=val;
        return 0;
    }
    int m=(x+y)/2;
    if (pos<=m) update(2*nod,x,m);
    else update(2*nod+1,m+1,y);
    if (mar[2*nod]>mar[2*nod+1]) mar[nod]=mar[2*nod];
    else mar[nod]=mar[2*nod+1];
    return 0;
}
int query(int nod,int x,int y)
{
    if (st<=x && dr>=y)
    {
        if (max<mar[nod]) max=mar[nod];
        return 0;
    }
    int m=(x+y)/2;
    if (st<=m) query(2*nod,x,m);
    if (dr>m) query(2*nod+1,m+1,y);
    return 0;
}
int main(void)
{
    fscanf(f,"%d%d",&n,&m);
    for (i=1;i<=n;i++)
    {
        fscanf(f,"%d",&val);
        pos=i;
        update(1,1,n);
    }
    for (i=1;i<=m;i++)
    {
        fscanf(f,"%d%d%d",&x,&a,&b);
        if (x==1)
        {
            pos=a;
            val=b;
            update(1,1,n);
        }
        else
        {
            st=a;
            dr=b;
            max=-1;
            query(1,1,n);
            fprintf(g,"%d\n",max);
        }
    }
    fclose(g);
    return 0;
}