#include <fstream>
#define NMAX 100005

using namespace std;

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

int i, n, pos, nrquiz, val, st, dr, v[4 * NMAX], type, ans;

void update(int left, int right, int node)
{
    if (left == right)
    {
        v[node] = val;
        return;
    }

    int mid = (left + right) / 2;

    if (pos <= mid)
        update(left, mid, 2 * node);
    else
        update(mid + 1, right, 2 * node + 1);

    v[node] = max(v[2 * node], v[2 * node + 1]);
}

void query(int left, int right, int node)
{
    if (st <= left && right <= dr)
    {
        ans = max(ans, v[node]);
        return;
    }

    int mid = (left + right) / 2;

    if (mid >= st)
        query(left, mid, 2 * node);

    if (mid < dr)
        query(mid + 1, right, 2 * node + 1);
}

int main()
{
    f >> n >> nrquiz;

    for (i = 1; i <= n; ++ i)
    {
        f >> val;
        pos = i;
        update(1, n, 1);
    }

    while (nrquiz)
    {
        nrquiz --;

        f >> type;

        if (type == 0)
        {
            f >> st >> dr;
            ans = 0;
            query(1, n, 1);
            g << ans << '\n';
        }

        if (type == 1)
        {
            f >> pos >> val;
            update(1, n, 1);
        }
    }
    return 0;
}