// bril.cpp : Defines the entry point for the console application.
//

//#include "stdafx.h"
//#include <fstream>
#include <cstdio>
#include <stdio.h>
using namespace std;

#define min(a,b) (a>b?b:a)
#define max(a,b) (a<b?b:a)


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

FILE *fin, *fout;








int noduri[230010];
int n, m,a,b;


void constr(int poz, int left, int right) {
	if (left == right) {
		//fin >> noduri[poz];
		//fscanf_s(fin, "%d", &noduri[poz]);
		fscanf(fin, "%d", &noduri[poz]);

	}
	else {
		int mid = (left + right) / 2;
		constr(2 * poz, left, mid);
		constr(2 * poz+1, mid+1, right);
		
		noduri[poz] = max(noduri[2 * poz], noduri[2 * poz + 1]);
	}
}


void do1(int poz, int left, int right) {
	if (left == a&&right == a)
		noduri[poz] = b;
	else {
		int mid = (left + right) / 2;
		if (a <= mid)
			do1(2*poz, left, mid);
		else
			do1(2*poz+1, mid+1, right);
		noduri[poz] = max(noduri[2 * poz], noduri[2 * poz + 1]);
	}
}

int do0(int poz, int a, int b, int left, int right) {
	if (left == a&&right == b)
		return noduri[poz];
	int mid = (left + right) / 2;
	if (b <= mid)
		return do0(2*poz, a, b, left, mid);
	if (a <= mid&&b > mid)
		return max(do0(2 * poz, a, mid, left, mid), do0(2 * poz + 1,mid+1,b, mid+1, right));
	if (a > mid)
		return do0(2 * poz+1, a, b, mid+1, right);
	return 0;

}


int main()
{
	
	//errno_t err;
	//err = fopen_s(&fin, "arbint.in", "r");
	//err = fopen_s(&fout, "arbint.out", "w");
	fin=fopen( "arbint.in", "r");
	fout=fopen("arbint.out", "w");
	//fin >> n >> m;
	fscanf(fin, "%d%d", &n,&m);
	//fscanf_s(fin, "%d%d", &n, &m);

	constr(1,1,n);
	int x, y, z;
	for (int i = 1; i <= m; ++i) {
		fscanf(fin, "%d%d%d", &x, &a,&b);
		//fscanf_s(fin, "%d%d%d", &x, &y, &z);
		if (x == 0)
			//fout << do0(1,y,z)<<"\n";
			fprintf(fout, "%d\n", do0(1,a,b,1,n));
		else
			do1(1,1,n);
	}
	fclose(fin);
	fclose(fout);
    return 0;
}