#include<cstdio>
using namespace std;
int n,x,y,t,op,k,ss,dd;
int arb[4*100000];
void push(int,int,int);
void maxi(int,int,int,int,int);
int main()
{
	freopen("arbint.in","rt",stdin);
	freopen("arbint.out","wt",stdout);
	scanf("%d%d",&n,&t);
	for(dd=1;dd<=n;dd++)
	{
		scanf("%d",&ss);
		push(1,1,n);
	}
	for(int i=1;i<=t;i++)
	{
		scanf("%d%d%d",&op,&dd,&ss);
		if(op)
		{
			push(1,1,n);
		}
		else
		{
			k = 0;
			maxi(1,1,n,dd,ss);
			printf("%d\n",k);
		}
	}
	return 0;
}
void push(int nod, int s, int d)
{
	if( s==d ) 
	{
		arb[nod]=ss;
		return ;
	}
	int m=(s+d)/2;
	if(dd <= m) push(2*nod, s ,m);
	  else push(2*nod+1,m+1,d);
	arb[nod]=(arb[2*nod] < arb[2*nod+1]) ? arb[2*nod+1]: arb[2*nod];
}
void maxi(int nod, int s, int d,int ss, int dd)
{
	if( ss <= s && d<=dd)
	{
		k = (arb[nod] > k) ? arb[nod] : k ;
		return ;
	}
	int m=(s+d)/2;
	if(ss<=m) maxi(2*nod, s ,m,ss,dd);
	if(m<dd) maxi(2*nod+1, m+1, d,ss,dd);
}