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

ifstream is("arbint.in");
ofstream os("arbint.out");

using VI = vector<int>;

int n, m, N;
VI arb;

void read();
void query();

int main()
{
    read();
    query();
    is.close();
    os.close();
    return 0;
}

void query()
{
    int tip, a, b, s;
    while ( m-- )
    {
        is >> tip >> a >> b;
        a += N - 1;
        if ( !tip )
        {
            b += N - 1;
            s = 0;
            while ( a <= b )
            {
                s = max(s, max(arb[a], arb[b]));
                a = ( a + 1 ) / 2;
                b = ( b - 1 ) / 2;
            }
            os << s << "\n";
        }
        else
        {
            arb[a] = b;
            a /= 2;
            while ( a )
            {
                arb[a] = max(arb[2 * a], arb[2 * a + 1]);
                a /= 2;
            }
        }
    }
}

void read()
{
    is >> n >> m;
    for ( N = 1; N <= n; N <<= 1 );
    arb = VI(2 * N);
    for ( int i = 1; i <= n; ++i )
        is >> arb[N + i - 1];
    for ( int i = N - 1; i; --i )
        arb[i] = max(arb[2 * i], arb[2 * i + 1]);
}