#include <cstdio>
#define DIM 10000
char buff[DIM];
int poz=0;

void citeste(int &numar)
{
     numar = 0;
     //cat timp caracterul din buffer nu e cifra ignor
     while (buff[poz] < '0' || buff[poz] > '9')
          //daca am "golit" bufferul atunci il umplu
          if (++poz == DIM)
               fread(buff,1,DIM,stdin),poz=0;
     //cat timp dau de o cifra recalculez numarul
     while ('0'<=buff[poz] && buff[poz]<='9')
     {
          numar = numar*10 + buff[poz] - '0';
          if (++poz == DIM)
               fread(buff,1,DIM,stdin),poz=0;
     }
}
using namespace std;
int v[100003];
int main ()
{
    freopen ("arbint.in","r",stdin);
    freopen ("arbint.out","w",stdout);
    int n,m,u=0;
    citeste(n),citeste(m);
    int a,b,c;
    for (int i=1;i<=n;++i)
    {
        citeste(v[i]);
    }
    for (int i=1;i<=m;++i)
    {
        citeste(a),citeste(b),citeste(c);
        if (a==0)
        {
        for (int j=b;j<=c;++j)
        {
            if (u<v[j])
                {
                    u=v[j];
                }
        }
        printf("%d\n",u);
        }
        if (a==1)
        {
            v[b]=c;
        }
        u=0;
    }
}