#include <iostream>
#include <climits>
#include <fstream>
using namespace std;

int arb[3000010],a,b;


void build_arb_i(int i, int li, int lf)
{
    if(li == lf)
    {
        arb[i] = b;
        return;
    }
    int mij=(li+lf)/2;
    if(mij >= a)
        build_arb_i(i*2,li, mij);
    else
       build_arb_i(i*2+1,mij+1, lf );

    arb[i] = max(arb[i*2], arb[i*2+1]);}


int maxim(int i,int li,int lf)
{
    if(a<=li&&lf<=b)return arb[i];
    int m=(li+lf)/2,v,mx=INT_MIN;
    if(a<=m)
    {
        v=maxim(2*i,li,m);
        if(v>mx)mx=v;
    }
    if(b>=m+1)
    {
        v=maxim(2*i+1,m+1,lf);
        if(v>mx)mx=v;
    }
    return mx;
}

int main()
{
    int n,i,c,m;
    ifstream fin("arbint.in");
    ofstream fout ("arbint.out");
    fin>>n>>m;
    for(i=1; i<=4*n; i++)arb[i]=-1;
    for(a=1; a<=n; a++)
    {
        fin>>b;
        build_arb_i(1,1,n);
    }

    for(i=1; i<=m; i++)
    {
        fin>>c>>a>>b;
        if(c==0)
            fout<<maxim(1,1,n)<<"\n";
        else
            build_arb_i(1,1,n);

    }

    return 0;
}