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#include <fstream>
using namespace std;
ifstream cin("arbint.in");
ofstream cout("arbint.out");
const int NMAX=100002;
int v[NMAX];
int n,m;
int c,b,a;
int functie(int a ,int b)
{
int ans=0;
for(int i=a;i<=b;i++)
ans=max(ans,v[i]);
return ans;
}
int main()
{
cin>>n>>m;
for(int i=1;i<=n;i++)cin>>v[i];
while(m)
{
cin>>c>>a>>b;
if(c==1)v[a]=b;
else cout<<functie(a,b)<<'\n';
m--;
}
return 0;
}