#include <iostream>
#include <fstream>
using namespace std;
ifstream fin("arbint.in");
ofstream fout("arbint.out");
int aint[40005],v1,v2;
void update(int n, int left, int right, int poz, int val)
{
if(left==right)
{
aint[n]=val;
return;
}
int mid=(left+right)/2;
if(poz<=mid){ update(2*n, left,mid, poz,val);}
else{update(2*n+1,mid+1,right,poz,val);}
aint[n]=max(aint[2*n],aint[2*n+1]);
}
int query(int n, int left, int right, int a,int b)
{
if(a<=left && right<=b) return aint[n];
v1=0; v2=0;
int mid =(left+right)/2;
if(a<=mid) v1=query(2*n,left,mid,a,b);
if(b>mid) v2=query(2*n+1, mid+1,right, a ,b);
return max(v1, v2);
}
int main()
{
int n,m,cer,a,b,x;
fin>>n>>m;
for(int i=1;i<=n;i++)
{
fin>>x;
update(1,1,n,i,x);
}
for(int i=0;i<m;i++)
{
fin>>cer>>a>>b;
if(cer==0)
{
fout<<query(1,1,n,a,b)<<'\n';
}
else
{
update(1,1,n,a,b);
}
}
return 0;
}