#include <iostream>
#include <fstream>
#include <math.h>
#include <stdlib.h>

int x[100000];
int batog[400];
int impartire,nr_impartiri;
int n;
using namespace std;

ifstream in("arbint.in");
ofstream out("arbint.out");


void calculare_max_batog(int y)
{int lim_sup;
int lim_inf=(y-1)*impartire+1;
if(n<y*impartire)lim_sup=n;
   else lim_sup=(y+1)*impartire;

    batog[y]=x[y*impartire];
    for(int i=lim_sup; i<lim_sup; i++)if(x[i]>batog[y])batog[y]=x[i];

}



void returneaza_maxim(int a, int b)
{int maxim=x[a];
   while(a%impartire!=1&&a<=b){if(x[a]>maxim)maxim=x[a];a++;}

   while(b%impartire!=1&&a<=b){if(x[b]>maxim)maxim=x[b];b--;}

a/=impartire;
b/=impartire;

   while(a<=b){if(batog[a]>maxim)maxim=batog[a];a++;}
  // cout<<maxim<<'\n';
   out<<maxim<<'\n';
}


void generare_batog()
{

    for(int i=1;i<=nr_impartiri;++i)
    {
        calculare_max_batog(i);

    }




}

int main()
{
    int op,arg1,arg2,nrop;
    in>>n>>nrop;


    impartire=(int)sqrt(n);
    nr_impartiri=n/impartire;

    for(int i=1; i<=n; i++)in>>x[i];


    generare_batog();

    for(int i=0; i<nrop; ++i)
    {
        in>>op>>arg1>>arg2;

        if(op==0)
        {


            returneaza_maxim(arg1,arg2);
        }
        else if(op==1)
        {x[arg1]=arg2;
calculare_max_batog(arg1/impartire);



        }


    }

    return 0;
}