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

const string fis = "arbint";
ifstream is(fis + ".in");
ofstream os(fis + ".out");

using VI = vector<int>;
using VS = vector<short>;
using VVI = vector<VI>;

int n, N, m;
int tip, a, b;
VI arb;

int main()
{
    is >> n >> m;
    for ( N = 1; N < n; N <<= 1 );
    arb = VI(2 * N);
    for ( int i = 0; i < n; ++i )
        is >> arb[N + i];
    for ( int i = N - 1; i; --i )
        arb[i] = max(arb[2 * i], arb[2 * i + 1]);
    while ( m-- )
    {
        is >> tip >> a >> b;
        if ( tip )
        {
            arb[N + a - 1] = b;
            for ( int i = ( N + a - 1 ) / 2; i; i /= 2 )
                arb[i] = max(arb[2 * i], arb[2 * i + 1]);
        }
        else
        {
            int s = 0;
            a += N - 1;
            b += N - 1;
            while  ( a <= b )
            {
                s = max(s, max(arb[a], arb[b]));
                a = ( a + 1 ) / 2;
                b = ( b - 1 ) / 2;
            }
            os << s << "\n";
        }
    }
    is.close();
    os.close();
    return 0;
}