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#include <fstream>
#include <climits>
#define NMAX 100002
using namespace std;
ifstream fin("arbint.in");
ofstream fout("arbint.out");
int N,M,tip,x,y,st,dr,vmax,v[NMAX];
void citire()
{
fin>>N>>M;
for(int i=1; i<=N; i++)
{
fin>>v[i];
}
}
int main()
{
citire();
for(int i=1; i<=M; i++)
{
fin>>tip>>x>>y;
if(tip==0)
{
vmax=INT_MIN;
st=x;
dr=y;
while(st<=dr)
{
vmax=max(vmax,v[st]);
st++;
}
fout<< vmax << "\n";
}
else
{
v[x]=y;
}
}
return 0;
}