#include <iostream>
#include <cstring>
#include <fstream>
using namespace std;
int v[100001], N, M, nr, a, b;

int main() {
	ifstream fin ("arbint.in");
	ofstream fout ("arbint.out");
	fin >> N >> M;
	for (int i = 1; i <= N; ++i) {
    fin >> v[i];
	}
	for (int i = 1; i <= N; ++i) {
    fin >> nr >> a >> b;
    if (nr == 0) {
      int maxim = -1;
      for (int j = a; j <= b; ++j) {
        if (v[j] > maxim) {
          maxim = v[j];
        }
      }
      fout << maxim << '\n';
    } else if (nr == 1) {
      v[a] = v[b];
    }
	}
	return 0;
}