#include <bits/stdc++.h>
#define ll int
#define double long double
#define pb push_back
#define endl '\n'
//#define er erase
//#define sz size
//#define in insert
//#define mp make_pair
//#define f first
//#define s second
//#define mod 1000000007
using namespace std;

ll n, m, a[100005], t[400050];

void build(ll *a, ll v, ll tl, ll tr){
    if(tl==tr)
    {
        t[v]=a[tl];
    }
    else
    {
        ll tm=(tl+tr)/2;
        build(a, 2*v, tl, tm);
        build(a, 2*v+1, tm+1, tr);
        t[v]=max(t[2*v], t[2*v+1]);
    }
}

void update(ll v, ll tl, ll tr, ll pos, ll val)
{
    if(tl==tr)
    {
        t[v]=val;
    }
    else
    {
        ll tm=(tl+tr)/2;
        if(pos>tm)
        {
            update(2*v+1, tm+1, tr, pos, val);
        }
        else
        {
            update(2*v, tl, tm, pos, val);
        }
        t[v]=max(t[2*v], t[2*v+1]);
    }
}

ll maxv(ll v, ll tl, ll tr, ll l, ll r)
{
    if(l>r)
        return 0;
    if(tl==l && tr==r)
    {
        return t[v];
    }
    ll tm=(tl+tr)/2;
    return max(maxv(2*v+1, tm+1, tr, max(tm+1, l), r), maxv(2*v, tl, tm, l, min(tm, r)));
}

int32_t main(){
    ifstream fin("arbint.in");
    ofstream fout("arbint.out");
    fin>>n>>m;
    for(ll i=0;i<n;i++)
        fin>>a[i];
    build(a, 1, 0, n-1);
    while(m--)
    {
        ll x;
        fin>>x;
        if(x==1)
        {
            ll a, b;
            fin>>a>>b;
            update(1, 0, n-1, a-1, b);
        }
        else
        {
            ll a, b;
            fin>>a>>b;
            fout<<maxv(1, 0, n-1, a-1, b-1)<<endl;
        }
    }
    return 0;
}