#include <fstream>
#include <deque>
#include <vector>
#include <bitset>
#include <queue>
#include <algorithm>
#include <cstring>
#include <climits>

#define MOD 1000000007

using namespace std ;

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

struct nod
{
    int st, dr, mid, val = 0 ;

    nod *fiust, *fiudr ;
};

int query(nod *tatal, int st, int dr)
{
  if(st > dr)return -1 ;

  if(tatal -> st == st && tatal -> dr == dr)return tatal -> val ;

  return max(query(tatal -> fiust, st, tatal -> mid), query(tatal -> fiudr, tatal -> mid + 1, dr)) ;
}

void update(nod *tatal, int poz, int x)
{
    if(tatal -> st == tatal -> dr)
    {
        tatal -> val = x ;

        return ;
    }

    if(poz <= tatal -> mid)update(tatal -> fiust, poz, x) ;
        else update(tatal -> fiudr, poz, x) ;

    tatal -> val = max(tatal -> fiust -> val, tatal -> fiudr -> val) ;
}
nod tree[400009] ;

void create(int f, int st, int dr)
{
    tree[f]. st = st ;
    tree[f]. dr = dr ;
    tree[f]. mid = (st + dr) / 2 ;

    if(st == dr)return ;

    tree[f].fiust = &tree[2 * f] ;
    tree[f]. fiudr = &tree[2 * f + 1] ;

    create(2 * f, st, tree[f]. mid) ;
    create(2 * f + 1, tree[f]. mid + 1, dr) ;
}


int v[100009], n ;

int main()
{
    int q ;

    cin >> n >> q ;

    create(1, 1, n) ;

    for(int f = 1, a ; f <= n ; f ++)
        cin >> a, update(&tree[1], f, a) ;

    while(q --)
    {
        int a, b, c ;

        cin >> a >> b >> c ;

        if(a == 0)
            cout << query(&tree[1], b, c) << '\n' ;
        else update(&tree[1], b, c) ;
    }

    return 0 ;
}