#include <stdio.h>
#include <fstream>
#include <iostream>
#include <assert.h>  
using namespace std;

#define in "arbint.in"
#define out "arbint.out"
#define dim 100001

int N, M;
int MaxArb[2 * dim];
int start, finish, Val, Pos, maxim;

inline int Maxim(int a, int b) {
	if (a > b) return a;
	return b;
}

void Update(int, int, int);
void Query(int, int, int);

int main()
{
	ifstream fin(in);
	ofstream fout(out);
	int X, A, B;

	fin >> N >> M;
	for (int i = 1; i <= N; i++)
	{
		fin >> X;
		Pos = i, Val = X;
		Update(1, 1, N);
	}

	//for (int i = 0; i < 4 * N; i++)
	//{
	//	cout << MaxArb[i] << ' ';
	//}

	//char c;
	//cin >> c;
	//return 0;

	for (int i = 1; i <= M; i++)
	{
		fin >> X >> A >> B;
		if (X == 0)
		{
			maxim = -1;
			start = A, finish = B;
			Query(1, 1, N);
			fout << maxim << '\n';
		}
		else
		{
			Pos = A, Val = B;
			Update(1, 1, N);
		}
	}
}

void Update(int nod, int left, int right)
{
	if (left == right)
	{
		MaxArb[nod] = Val;
		return;
	}

	int div = (left + right) / 2;
	if (Pos <= div)
	{
		Update(2 * nod, left, div);
	}
	else
	{
		Update(2 * nod + 1, div + 1, right);
	}

	MaxArb[nod] = Maxim(MaxArb[2 * nod], MaxArb[2 * nod + 1]);
}

void Query(int nod, int left, int right)
{
	if (start <= left && right <= finish)
	{
		if (maxim < MaxArb[nod])
		{
			maxim = MaxArb[nod];
		}
		return;
	}

	int div = (left + right) / 2;
	if (start <= div)
	{
		Query(2 * nod, left, div);
	}
	if (div < finish)
	{
		Query(2 * nod + 1, div + 1, right);
	}
}