#include <fstream>

using namespace std;

int n,m,adi[400000],x,tip,y,maxim;

void init (int st,int dr,int nod)
{
    if (st==dr)
    {
        adi[nod]=y;
    }else
    {
        int m=(st+dr)/2;
        if (x<=m) init(st,m,nod*2);else init(m+1,dr,nod*2+1);
        adi[nod]=adi[nod*2]; if (adi[nod*2+1]>adi[nod]) adi[nod]=adi[nod*2+1];
    }
}

void scoate(int st,int dr,int nod)
{
    if (x<=st && dr<=y)
    {
        if (maxim<adi[nod]) maxim=adi[nod];
    }else
    {
        int m=(st+dr)/2;
        if (x<=m) scoate(st,m,nod*2);
        if (y>m) scoate(m+1,dr,nod*2+1);
    }

}

int main()
{
    ifstream in ("arbint.in");
    ofstream out ("arbint.out");

    in>>n>>m;
    for (int i=1;i<=n;++i)
    {
        in>>y;
        x=i;
        init(1,n,1);
    }

    for (int i=1;i<=m;++i)
    {
        in>>tip>>x>>y;
        if (tip==0)
        {
            maxim=0;
            scoate(1,n,1);
            out<<maxim<<"\n";
        }else
        {
            init(1,n,1);
        }
    }

    in.close();
    out.close();
    return 0;
}