#include <bits/stdc++.h>
using namespace std;
#define N_MAX 100000
ifstream f("arbint.in");
ofstream g("arbint.out");
int tree[4 * N_MAX + 5];
int v[N_MAX + 5];
int n , m;
int cod;
int a , b , rez=INT_MIN;
void build(int node, int le, int ri) {
if(le == ri) {
tree[node] = v[le];
return;
}
int mid = (le + ri) / 2;
build(2 * node, le, mid);
build(2 * node + 1, mid + 1, ri);
tree[node] = max(tree[2 * node], tree[2 * node + 1]);
}
void update(int node, int le, int ri, int pos, int val) {
if(le == ri) {
tree[node] = val;
return;
}
int mid = (le + ri) / 2;
if(pos <= mid) {
update(2 * node, le, mid, pos, val);
}
else {
update(2 * node + 1, mid + 1, ri, pos, val);
}
tree[node] = max(tree[2 * node], tree[2 * node + 1]);
}
void query(int node, int le, int ri, int x, int y, int &ans) {
if(x <= le && ri <= y) {
ans = max(ans, tree[node]);
return;
}
int mid = (le + ri) / 2;
if(x <= mid) {
query(2 * node, le, mid, x, y, ans);
}
if(y > mid) {
query(2 * node + 1, mid + 1, ri, x, y, ans);
}
}
int main(){
f >> n >> m;
for(int i=1 ; i<=n ; i++)
{
f >> v[i];
}
///formam arborele de intervale
build(1,1,n);
for(int i=1 ; i<=m ; i++)
{
f >> cod;
f >> a >> b;
if(cod==0)
{
rez=INT_MIN;
query(1,1,n,a,b,rez);
g << rez << "\n";
}
else
{
update(1,1,n,a,b);
}
}
return 0;
}