#include <bits/stdc++.h>

#define INF 10000

using namespace std;

int n;
int arb[400000], poz, val, a, b;

void update(int p, int st, int dr)
{
    if(st == dr)
    {
        arb[p] = val;
        return;
    }
    int m = (st + dr) / 2;
    if(poz <= m)
        update(2*p, st, m);
    else
        update(2*p+1, m+1, dr);
    arb[p] = max(arb[2*p], arb[2*p+1]);
}

int query(int p, int st, int dr)
{
    if(a <= st && dr <= b)
        return arb[p];
    int m = (st + dr) / 2, m1 = -INF, m2 = -INF;
    if(a <= m)
        m1 = query(2*p, st, m);
    if(b > m)
        m2 = query(2*p+1, m+1, dr);
    return max(m1, m2);
}

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

    ios_base::sync_with_stdio(false);

    int m, i, x;

    fin >> n >> m;

    for(poz = 1; poz <= n; ++poz)
    {
        fin >> val;
        update(1, 1, n);
    }

    do {
        fin >> x;
        if(x == 1)
        {
            fin >> poz >> val;
            update(1, 1, n);
        }
        else
        {
            fin >> a >> b;
            (fout << query(1, 1, n)).put('\n');
        }
    } while(--m);
    return 0;
}