#include <fstream>

#define buffLen 31
#define aiLen 262145

using namespace std;

ifstream cin;
ofstream cout;

char buff[buffLen];
int index = 0;

int ai[aiLen];

inline void read(int & num)
{
    num = 0;
    
    while(buff[index] < '0' || '9' < buff[index])
        if( ++ index == buffLen)
        {
            index = 0;
            cin.clear();
            cin.sync();
            cin.ignore();
            cin.getline(buff, buffLen);
        }

    while('0' <= buff[index] && buff[index] <= '9')
    {
        num = num * 10 + buff[index] - '0';
        if( ++ index == buffLen)
        {
            index = 0;
            cin.clear();
            cin.sync();
            cin.ignore();
            cin.getline(buff, buffLen);
        }
    }
}

inline int max(int a, int b)
{
    if(a > b) return a;
    return b;
}

inline void update(int nod, int L, int R, int idx, int val)
{
    if(L == idx && idx == R)
    {
        ai[nod] = val;
        return;
    }

    int M = L + (R - L) / 2;

    if(idx <= M) update(2 * nod, L, M, idx, val);
    else update(2 * nod + 1, M + 1, R, idx, val);

    ai[nod] = max(ai[2 * nod], ai[2 * nod + 1]);
}

inline int query(int nod, int L, int R, int a, int b)
{
    if(a <= L && R <= b) return ai[nod];

    int M = L + (R - L) / 2;

    int ret1 = 0;
    int ret2 = 0;

    if(a <= M) ret1 = query(2 * nod, L, M, a, b);
    if(b > M) ret2 = query(2 * nod + 1, M + 1, R, a, b);

    return max(ret1, ret2);
}

int main()
{
    cin.open("arbint.in");
    cout.open("arbint.out");

    cin.getline(buff, buffLen);

    int N, M;
    read(N);
    read(M);

    for(int i = 1; i <= N; ++ i)
    {
        int x;
        read(x);

        update(1, 1, N, i, x);
    }

    while(M -- )
    {
        int x, a, b;
        read(x);
        read(a);
        read(b);

        if(x == 0)
            cout << query(1, 1, N, a, b) << '\n';
        else
            update(1, 1, N, a, b);
    }

    cin.close();
    cout.close();

    return 0;
}