#include <bits/stdc++.h>
using namespace std;


#define nmax 100001

int N, M;
int MaxArb[4*nmax+66];
int start, finish, Val, Pos, maxim;

int Maxim(int a, int b)
{
    return a>b?a: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;
    freopen("arbint.in","r",stdin);
    freopen("arbint.out","w",stdout);

    cin>>N>>M;
    for ( int i = 1; i <= N; i++ )
    {
        cin>>X;
        Pos = i, Val = X;
        Update(1,1,N);
    }

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

            printf("%d\n", maxim);
        }
        else
        {
            Pos = A, Val = B;
            Update(1,1,N);
        }
    }
}