#include<iostream>
#include<fstream>
using namespace std;
const int N=100010;
unsigned int m, n,i,j,op;
    unsigned long s[10*N];
int main()
{

    ifstream f("arbint.in");
    ofstream g("arbint.out");
    f>>n>>m;
    for(i=1;i<=n;i++) f>>s[i];
    for(j=1;j<=m;j++)
    {
        f>>op;
        if(op==1)
        {unsigned int a,b;
            f>>a>>b;
            s[a]=b;
        }
        else
        {unsigned int a;
        unsigned long b;
            f>>a>>b;
            unsigned long max=0;
            for(i=a;i<=b;i++)
                if(max<s[i]) max=s[i];
            g<<max<<endl;
        }
    }
    f.close();
    g.close();
    return 0;
}