#include <iostream>
#include <fstream>

using namespace std;

int arbint[400001], v[100001];

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

void build(int node, int st, int dr)
{
    if(st == dr)
        arbint[node] = v[st];
    else
    {
        int mij = (st + dr) / 2;

        build(node * 2, st, mij);
        build(node * 2 + 1, mij + 1, dr);

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

void update(int node, int st, int dr, int poz, int val)
{
    if(st == dr)
        arbint[node] = val;
    else
    {
        int mid = (st + dr) / 2;

        if(poz <= mid)
            update(node * 2, st, mid, poz, val);
        else
            update(node * 2 + 1, mid + 1, dr, poz, val);

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

int query(int node, int st, int dr, int query_st, int query_dr)
{
    if(st >= query_st && dr <= query_dr)
        return arbint[node];
    else
    {
        int mid = (st + dr) / 2;

        if(query_dr <= mid)
            return query(node * 2, st, mid, query_st, query_dr);

        if(query_st > mid)
            return query(node * 2 + 1, mid + 1, dr, query_st, query_dr);

        return max(query(node * 2, st, mid, query_st, query_dr), query(node * 2 + 1, mid + 1, dr, query_st, query_dr));
    }
}

int main()
{
    int n, m;
    fin >> n >> m;

    for(int i = 1; i <= n; i++)
        fin >> v[i];

    build(1, 1, n);

    while(m)
    {
        bool o;
        int a, b;
        fin >> o;
        if(o == 0)
        {
            fin >> a >> b;
            fout << query(1, 1, n, a, b) << endl;
        }
        else
        {
            fin >> a >> b;
            update(1, 1, n, a, b);
        }
        m--;
    }
    return 0;
}