#include <iostream>
#include <fstream>
#define DIM 100000

using namespace std;

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

int AINT[4 * DIM + 5], V[DIM + 5];
int N, M, op, a, b;

void build(int node, int left, int right)
{
	if (left == right)
		AINT[node] = V[left];
	else
	{
		int middle = (left + right) >> 1;

		build(node << 1, left, middle);
		build(node << 1 | 1, middle + 1, right);

		AINT[node] = max(AINT[node << 1], AINT[node << 1 | 1]);
	}
}

void update(int node, int left, int right, int pos, int value)
{
	if (left == right)
		AINT[node] = value;
	else
	{
		int middle = (left + right) >> 1;
		if (pos <= middle)
			update(node << 1, left, middle, pos, value);
		if (pos > middle)
			update(node << 1 | 1, middle + 1, right, pos, value);

		AINT[node] = max(AINT[node << 1], AINT[node << 1 | 1]);
	}
}

int query(int node, int left, int right, int a, int b)
{
	if (a <= left && right <= b)
		return AINT[node];
	else
	{
		int middle = (left + right) >> 1;
		if (b <= middle)
			return query(node << 1, left, middle, a, b);
		if (middle + 1 <= a)
			return query(node << 1 | 1, middle + 1, right, a, b);
		return max(query(node << 1, left, middle, a, b), query(node << 1 | 1, middle + 1, right, a, b));
	}
}

int main()
{
	f >> N >> M;
	for (int i = 1; i <= N; i++)
		f >> V[i];
	build(1, 1, N);
	while (M--)
	{
		f >> op >> a >> b;
		if (op == 0)
			g << query(1, 1, N, a, b) << '\n';
		else // if (op == 1)
			update(1, 1, N, a, b);
	}
	f.close();
	g.close();
    return 0;
}