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

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

int arb[400066];
int val, poz, n, m, x, y, maxim, k, i;
void update(int nod, int st, int dr)
{
    if(st == dr)
    {
        arb[nod] = val;
        return;
    }
    int med = (st + dr) / 2;
    if(med >= poz)
        update(nod*2, st, med);
    else
        update(nod*2+1, med+1, dr);
    arb[nod] = max(arb[nod*2], arb[nod*2+1]);
}

void query(int nod, int st, int dr)
{
    if(st >= x && dr <= y)
    {
        maxim = max(maxim, arb[nod]);
        return;
    }
    int med = (st + dr) / 2;
    if(med >= x)
        query(nod*2, st, med);
    if(y>med)
        query(nod*2+1, med+1, dr);
}

int main()
{
    f >> n >> m;
    for(i = 1; i <= n; ++i)
    {
        f >> val;
        poz = i;
        update(1, 1, n);
    }
    while(m--)
    {
        f >> k;
        if(k == 1)
        {
            f >> poz >> val;
            update(1, 1, n);
        }
        else
        {
            f >> x >> y;
            maxim = 0;
            query(1, 1, n);
            g << maxim << '\n';
        }
    }
    return 0;
}