#include <iostream>
#include <fstream>
using namespace std;
const int MAX_N = 100100;
const int INF = 1 << 30;
ifstream fin("arbint.in");
ofstream fout("arbint.out");
int segTree[MAX_N * 4];
void update(int nod, int lo, int hi, int a, int b);
int query(int nod, int lo, int hi, int a, int b);
int N, M;
int main() {
    fin >> N >> M;
    for (int i = 1; i <= N; ++i) {
        int x;
        fin >> x;
        update(1, 1, N, i, x);
    }

    for (int i = 1; i <= M; ++i) {
        int action, a, b;
        fin >> action >> a >> b;
        if (action == 1) {
            update(1, 1, N, a, b);
        } else {
            fout << query(1, 1, N, a, b) << '\n';
        }
    }
    return 0;
}

void update(int nod, int lo, int hi, int a, int b) {
    if (lo == hi) {
        segTree[nod] = b;
    } else {
        int mid = lo + (hi - lo) / 2;
        if (a <= mid) {
            update(nod * 2, lo, mid, a, b);
        } else {
            update(nod * 2 + 1, mid + 1, hi, a, b);
        }
        segTree[nod] = max(segTree[nod*2], segTree[nod*2+1]);
    }
}
int query(int nod, int lo, int hi, int a, int b) {
    if (a <= lo && b >= hi) {
        return segTree[nod];
    }
    int result = 0;
    int mid = lo + (hi - lo) / 2;
    if (a <= mid) {
        result = max(result, query(nod * 2, lo, mid, a, b));
    }
    if (b > mid) {
        result = max(result, query(nod * 2 + 1, mid + 1, hi, a, b));
    }
    return result;
}