#include <iostream>
#include <fstream>
#include <assert.h>  
using namespace std;


#define dim 100001

ifstream in ("arbint.in");
ofstream out ("arbint.out");

int N, M;
int MaxArb[dim];
int start, finish, Val, Pos, maxim;

int Maxim(int a, int b) {
       if ( a > b ) return a;
       return b;
}
 
void Update(int nod, int left, int right)
{
     if ( left == right )
     {
          MaxArb[nod] = Val;
          return;
     }
     
     int div = (left+right)/2;
     if ( Pos <= div ) Update(2*nod,left,div);
     else              Update(2*nod+1,div+1,right);
     
     MaxArb[nod] = Maxim( MaxArb[2*nod], MaxArb[2*nod+1] );
}

void Query(int nod, int left, int right)
{
     if ( start <= left && right <= finish )
     {
          if ( maxim < MaxArb[nod] ) maxim = MaxArb[nod];
          return;
     }
     
     int div = (left+right)/2;
     if ( start <= div ) Query(2*nod,left,div);
     if ( div < finish ) Query(2*nod+1,div+1,right);
}

int main()
{
    int X, A, B;
   
    
    in >> N >> M;
    for ( int i = 1; i <= N; i++ )
    {
        in >> X;
        Pos = i, Val = X;
        Update(1,1,N);
    }   
    
    for ( int i = 1; i <= M; i++ )
    {
        in >> X >> A >> B;
        if ( X == 0 ) 
        {
             maxim = -1;
             start = A, finish = B;
             Query(1,1,N);
             
             out << maxim << "\n";
        }
        else
        {
            Pos = A, Val = B;
            Update(1,1,N);
        }
    }
}