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#include <bits/stdc++.h>
using namespace std;
ifstream f("arbint.in");
ofstream g("arbint.out");
int64_t n,m,v[100001],maxx,c,a,b;
void maxim(int a,int b)
{
for(int i=a;i<=b;i++)
if(v[i]>maxx)
maxx=v[i];
}
int main()
{
f>>n>>m;
for(int i=1;i<=n;i++)
{
f>>v[i];
}
for(int i=1;i<=m;i++)
{
f>>c>>a>>b;
if(c==0)
{
maxx=-1;
maxim(a,b);
g<<maxx<<'\n';
}
else
v[a]=b;
}
return 0;
}