#include <bits/stdc++.h>

using namespace std;

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

int n, m, x, t, a, b;
vector<int> aint;

int update(int index, int node_left, int node_right, int update_index, int val)
{
    // not included
    if (update_index < node_left || node_right < update_index)
        return aint[index];

    // included and leaf node
    if (node_left == node_right)
    {
        aint[index] = val;
        return val;
    }

    int m = node_left + (node_right - node_left) / 2;
    return (aint[index] = max(
                update(index * 2, node_left, m, update_index, val),
                update(index * 2 + 1, m + 1, node_right, update_index, val)));
}

int query(int index, int node_left, int node_right, int query_left, int query_right)
{
    // node included in query segment - return all
    if (query_left <= node_left && node_right <= query_right)
        return aint[index];

    // query segment not intersecting node segment
    if (query_right < node_left || node_right < query_left)
        return INT_MIN;

    int m = node_left + (node_right - node_left) / 2;
    return max(
        query(index * 2, node_left, m, query_left, query_right),
        query(index * 2 + 1, m + 1, node_right, query_left, query_right));
}

int main()
{
    f >> n >> m;
    aint.resize(n * 5, INT_MIN);

    for (int i = 1; i <= n; ++i)
        f >> x,
        update(1, 1, n, i, x);

    while (m--)
    {
        f >> t >> a >> b;
        if (t)
            update(1, 1, n, a, b);
        else
            g << query(1, 1, n, a, b) << '\n';
    }

    return 0;
}