#include <fstream>

using namespace std;
ifstream cin ("arbint.in");
ofstream cout ("arbint.out");
int n,m,key,poz,arb[500010],a,b;
void up_date (int st,int dr,int nod)
{
    if(st>=poz && dr<=poz)
        arb[nod]=key;
    else
    {
        int mij=(st+dr)/2;
        if(poz<=mij) up_date(st,mij,nod*2);
        if(poz>mij) up_date(mij+1,dr,nod*2+1);
        if(arb[nod*2]>arb[nod*2+1]) arb[nod]=arb[nod*2]; else arb[nod]=arb[nod*2+1];
    }
}
void read ()
{
    cin>>n>>m;
    for(int i=1;i<=n;i++)
    { poz=i;
        cin>>key;
        up_date(1,n,1);
    }
}
int figure_it_out (int st,int dr,int nod)
{
    if(st>=a && dr<=b)
        return arb[nod];
    int mij=(st+dr)/2;
    int x1=0,x2=0;
    if(a<=mij) x1=figure_it_out(st,mij,nod*2);
    if(b>mij) x2=figure_it_out(mij+1,dr,nod*2+1);
    if(x1>x2) return x1;
        return x2;
}
void solve_here_man ()
{ int h;
    for(int i=1;i<=m;i++)
    {
        cin>>h>>a>>b;
        if(h==0) cout<<figure_it_out(1,n,1)<<"\n";
        else poz=a,key=b,up_date(1,n,1);
    }
}
int main()
{
    read();
    solve_here_man();
    cin.close();
    cout.close();
    return 0;
}