#include <bits/stdc++.h>
#define DIM 100005
using namespace std;
ifstream f("arbint.in");
ofstream g("arbint.out");
int n, m, v[DIM], aint[4 * DIM];
void build(int node, int st, int dr) {
if (st == dr) {
aint[node] = v[st];
return;
}
int mid = (st + dr) / 2;
build(2 * node, st, mid);
build(2 * node + 1, mid + 1, dr);
aint[node] = max(aint[2 * node], aint[2 * node + 1]);
}
void update(int node, int st, int dr, int pos, int val) {
if (st == dr) {
aint[node] = val;
return ;
}
int mid = (st + dr) / 2;
if (pos <= mid) {
update(2 * node, st, mid, pos, val);
} else {
update(2 * node + 1, mid + 1, dr, pos, val);
}
aint[node] = max(aint[2 * node], aint[2 * node + 1]);
}
int query(int node, int st, int dr, int stQ, int drQ) {
if (stQ <= st && dr <= drQ) {
return aint[node];
}
int mid = (st + dr) / 2, r1(0), r2(0);
if (stQ <= mid) {
r1 = query(2 * node, st, mid, stQ, drQ);
}
if (mid < drQ) {
r2 = query(2 * node + 1, mid + 1, dr, stQ, drQ);
}
return max(r1, r2);
}
int main() {
f >> n >> m;
for (int i = 1; i <= n; i++) {
f >> v[i];
}
build(1, 1, n);
for (int i = 1; i <= m; i++) {
int op, x, y;
f >> op >> x >> y;
if (op == 0) {
g << query(1, 1, n, x, y) << '\n';
} else {
update(1, 1, n, x, y);
}
}
return 0;
}