#include <bits/stdc++.h>
using namespace std;
ifstream f("arbint.in");
ofstream g("arbint.out");
const int N = 1 << 17;
int n, m, c, x, y, e[18][N];
void update();
int main()
{
    f >> n >> m;
    for(int i = 1; i <= n; i++)
        f >> e[0][i];
    for(int i = 1, p = 1, P = 2; P <= n; i++, p <<=1, P <<=1)
        for(int st = 1, mi = p + 1, dr = P; dr <= n; st++, mi++, dr++)
            e[i][st] = (e[i-1][st]<e[i-1][mi])?e[i-1][mi]:e[i-1][st];
    for(; m; m--)
    {
        f >> c >> x >> y;
        if(c == 0)
        {
            int number = y - x, answer = 0;
            while(number)
            {
                int power = 31 - __builtin_clz(y - x);
                answer = max(answer, max(e[power][x], e[power][y + 1 - (1<<power)]));
                number -= (1 << power);
                x += (1 << power);
            }
            g << answer << '\n';
        }
        else
            update();
    }
    return 0;
}
void update()
{
    e[0][x] = y;
    for(int i = 1, p = 1, P = 2; P <= n; i++, p <<=1, P <<=1)
        for(int st = 1, mi = p + 1, dr = P; dr <= n; st++, mi++, dr++)
            e[i][st] = (e[i-1][st]<e[i-1][mi])?e[i-1][mi]:e[i-1][st];
}