#include <bits/stdc++.h>
#define ll long long
#define cin fin
#define cout fout
using namespace std;
	
ifstream fin("arbint.in");
ofstream fout("arbint.out");
int n, m, v[100005];

int main() {
	cin >> n >> m;
	for (int i = 1; i <= n; i++) 
		cin >> v[i];

	for (int query = 1; query <= m; query++) {
		int type, a, b;

		cin >> type >> a >> b;
		if (type == 1) 
			v[a] = b;
		else {
			int maxx = 0;
			for (int i = a; i <= b; i++)
				maxx = max(maxx, v[i]);

			cout << maxx << '\n';
		}

	}

 
	return 0;
}