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

long m,n,v[100001];
ifstream f("arbint.in");
ofstream g("arbint.out");

void citire()
{
     f>>n>>m;
     for(long i=1;i<=n;i++)
              f>>v[i];
}

void prelucrare_maxim(long a,long b)
{
     long max=v[a];
     for(long i=a+1;i<=b;i++)
              if(max<v[i])
                         max=v[i];
     g<<max<<"\n";
}

void prelucrare_schimb_val(long a,long b)
{
     v[a]=b;
}

int main()
{
    citire();
    for(long i=1;i<=m;i++)
             {
                          long a,b;
                          short opt;
                          
                          f>>opt>>a>>b;
                          if(opt==0)
                                    prelucrare_maxim(a,b);
                          else prelucrare_schimb_val(a,b);
             }
    f.close();
    g.close();
    return 0;
}