#include <fstream>
#include <algorithm>

using namespace std;

int arb[200010], n;

class InParser
{
private:
    FILE *fin;
    char *buff;
    int sp;

    char read_ch()
    {
        ++sp;
        if (sp == 4096)
        {
            sp = 0;
            fread(buff, 1, 4096, fin);
        }
        return buff[sp];
    }

public:
    InParser(const char* nume)
    {
        fin = fopen(nume, "r");
        buff = new char[4096]();
        sp = 4095;
    }

    InParser& operator >> (int &n)
    {
        char c;
        while (!isdigit(c = read_ch()) && c != '-');
        int sgn = 1;
        if (c == '-')
        {
            n = 0;
            sgn = -1;
        }
        else
        {
            n = c - '0';
        }
        while (isdigit(c = read_ch()))
        {
            n = 10 * n + c - '0';
        }
        n *= sgn;
        return *this;
    }

    InParser& operator >> (long long &n)
    {
        char c;
        n = 0;
        while (!isdigit(c = read_ch()) && c != '-');
        long long sgn = 1;
        if (c == '-')
        {
            n = 0;
            sgn = -1;
        }
        else
        {
            n = c - '0';
        }
        while (isdigit(c = read_ch()))
        {
            n = 10 * n + c - '0';
        }
        n *= sgn;
        return *this;
    }
};

class OutParser {
private:
    FILE *fout;
    char *buff;
    int sp;

    void write_ch(char ch) {
        if (sp == 50000) {
            fwrite(buff, 1, 50000, fout);
            sp = 0;
            buff[sp++] = ch;
        } else {
            buff[sp++] = ch;
        }
    }


public:
    OutParser(const char* name) {
        fout = fopen(name, "w");
        buff = new char[50000]();
        sp = 0;
    }
    ~OutParser() {
        fwrite(buff, 1, sp, fout);
        fclose(fout);
    }

    OutParser& operator << (int vu32) {
        if (vu32 <= 9) {
            write_ch(vu32 + '0');
        } else {
            (*this) << (vu32 / 10);
            write_ch(vu32 % 10 + '0');
        }
        return *this;
    }

    OutParser& operator << (long long vu64) {
        if (vu64 <= 9) {
            write_ch(vu64 + '0');
        } else {
            (*this) << (vu64 / 10);
            write_ch(vu64 % 10 + '0');
        }
        return *this;
    }

    OutParser& operator << (char ch) {
        write_ch(ch);
        return *this;
    }
    OutParser& operator << (const char *ch) {
        while (*ch) {
            write_ch(*ch);
            ++ch;
        }
        return *this;
    }
};

inline void build ()
{
    for (int i = n - 1; i; --i)
        arb[i] = max (arb[(i << 1)], arb[(i << 1) + 1]);
}

inline void update (int poz, int val)
{
    arb[poz += n - 1] = val;
    for (poz >>= 1; poz; poz >>= 1)
        arb[poz] = max (arb[poz << 1], arb[(poz << 1) + 1]);
}

inline int querry (int st, int dr)
{
    int rez = -1;
    for (st += n - 1, dr += n; st < dr; st >>= 1, dr >>= 1)
    {
        if (st & 1) rez = max (rez, arb[st++]);
        if (dr & 1) rez = max (rez, arb[--dr]);
    }

    return rez;
}

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

    int m;
    cin >> n >> m;

    for (int i = 0; i < n; ++i)
        cin >> arb[i + n];

    build ();

    for (int i = 1; i <= m; ++i)
    {
        int op, x, y;
        cin >> op >> x >> y;

        if (!op) cout << querry (x, y) << '\n';
        else update (x, y);
    }

    return 0;
}