#include <bits/stdc++.h>

using namespace std;

vector<int> segm_tree;

ifstream fin("arbint.in");
ofstream fout("arbint.out");

void init(int l, int r, int node)
{
    if (l == r) {
        fin >> segm_tree[node];
        return;
    }

    int mid = (l + r) / 2;
    int left = node * 2, right = left + 1;

    init(l, mid, left);
    init(mid + 1, r, right);

    segm_tree[node] = max(segm_tree[left], segm_tree[right]);                                   /* pasul de procesare, in cazul asta gaseste maximul din segment */
}

void update(int pos, int val, int l, int r, int node)
{
    if (l == r) {
        segm_tree[node] = val;
    }

    int mid = (l + r) / 2;                                                                      /* indexul de mijloc al segmentului curent */
    int left = node * 2, right = left + 1;                                                      /* indexii din vectorul segm_tree */

    if (pos <= mid)
        update(pos, val, l, mid, node);
    else
        update(pos, val, mid+1, r, node);

    segm_tree[node] = max(segm_tree[left], segm_tree[right]);                                   /* cand urc vreau sa updatez max-urile */
}

int query(int ql, int qr, int l, int r, int node)                                               /* va returna maximul pe segmentul (ql, qr) */
{
    if (l <= ql && qr <= r)
        return segm_tree[node];

    int mid = (l+r)/2;
    int left = node * 2, right = left + 1;
    int left_result = -1, right_result = -1;

    if (l <= ql && ql <= mid)
        left_result = query(ql, qr, l, mid, left);
    if (mid+1 <= qr && qr <= r)
        right_result = query(ql, qr, mid+1, r, right);

    return max(left_result, right_result);
}

int main()
{
    int n, m;
    fin >> n >> m;
    segm_tree.resize(n << 2);

    while (m--) {
        int c, a, b;
        fin >> c >> a >> b;

        if (c == 0)
            fout << query(a, b, 1, n, 1) << endl;
        else if (c == 1)
            update(a, b, 1, n, 1);
    }
}