#include <iostream>
#include <fstream>

using namespace std;

#define MAXN 100010

FILE* f = fopen("arbint.in", "r");
FILE* g = fopen("arbint.out", "w");

int n, mx;
int aint[3 * MAXN];

void update(int poz, int val, int st = 1, int dr = n, int nod = 1)
{
    if (st == dr) {
        aint[nod] = val;
        return ;
    }

    int mij = ((st + dr) >> 1);

    if (poz <= mij) {
       update(poz, val, st, mij, nod << 1);
    } else {
        update(poz, val, mij + 1, dr, (nod << 1) + 1);
    }
    aint[nod] = max(aint[nod << 1], aint[(nod << 1) + 1]);
}

void query(int x, int y, int st = 1, int dr = n, int nod = 1)
{
    if (x <= st && dr <= y) {
        mx = max(mx, aint[nod]);
        return ;
    }

    int mij = ((st + dr) >> 1);
    if (x <= mij) {
        query(x, y, st, mij, nod << 1);
    }
    if (y > mij) {
        query(x, y, mij + 1, dr, (nod << 1) + 1);
    }

    return ;
}

int main()
{
    int m;
    fscanf (f, "%d %d\n", &n, &m);

    for (int i = 1, x; i <= n; i++) {
        fscanf(f, "%d ", &x);
        update(i, x);
    }

    for (int i = 1, op, x, y; i <= m; i++) {
       fscanf(f, "%d %d %d\n", &op, &x, &y);

        switch (op) {
            case 0: mx = 0; query(x, y); fprintf(g, "%d\n", mx); break;
            case 1: update(x, y); break;
        }
    }

    fclose(f);
    fclose(g);
    return 0;
}