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#include <fstream>
using namespace std;
ifstream f("arbint.in");
ofstream g("arbint.out");
int v[100001],i,n,m,a,b;
bool x;
int maxim(int v[], int i, int j){
int cmax=0;
for(i; i<=j; i++){
if(v[i]>cmax)
cmax=v[i];
}
return cmax;
}
int main()
{
f>>n>>m;
for(i=1; i<=n; i++)
f>>v[i];
for(i=1; i<=m; i++){
f>>x;
f>>a>>b;
if(!x){
g<<maxim(v,a,b)<<"\n";
}
else
v[a]=b;
}
return 0;
}