#include <bits/stdc++.h>
using namespace std;
#define NMAX 100005

int n, m, v[NMAX];

int getMax(int left, int right) {
    if(left == right) {
        return v[left];
    }
    int mid = (left + right) / 2;
    return max(getMax(left, mid), getMax(mid + 1, right));
}

void update(int elem, int pos) {
    v[pos - 1] = elem;
}

int main() {

    freopen("arbint.in", "r", stdin);
    freopen("arbint.out", "w", stdout);

    scanf("%d%d", &n, &m);
    for(int i = 0; i < n; i++) {
        scanf("%d", &v[i]);
    }

    for(int i = 0; i < m; i++) {
        int op, a, b;
        scanf("%d%d%d", &op, &a, &b);
        if(op == 0) {
            printf("%d\n", getMax(a - 1, b - 1));
        } else {
            update(b, a);
        }
    }
    return 0;
}