#include <fstream>
using namespace std;

ifstream fin("arbint.in");
ofstream fout("arbint.out");
#define dim 100001

int N, M;
int MaxArb[4*dim+66];
int start, finish, Val, Pos, maxim;
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] = max( 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;
        fin>>N>>M;
    for ( int i = 1; i <= N; i++ )
    {
        fin>>X;
        Pos = i, Val = X;
        Update(1,1,N);
    }

    for ( int i = 1; i <= M; i++ )
    {
        fin>>X>>A>>B;
        if ( X == 0 )
        {
             maxim = -1;
             start = A, finish = B;
             Query(1,1,N);

             fout<<maxim<<endl;
        }
        else
        {
            Pos = A, Val = B;
            Update(1,1,N);
        }
    }
}