#include <bits/stdc++.h>
using namespace std;
int n,m,v[200005],arb[200005];
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 >= 0; --i)
        arb[i] = max(arb[i*2],arb[i*2 + 1]);
    return ;
}
inline void update (int pos)
{
    for (pos/=2 ; pos ; pos/=2)
        arb[pos] = max(arb[pos*2],arb[pos*2 + 1]);
    return ;
}
inline int query(int st,int dr)
{
    int  res = -1;
    st+=n-1;
    dr+=n;
    while(st<dr)
    {
        if (st & 1)res = max(res,arb[st++]);
        if (dr & 1)res = max(res,arb[--dr]);
        st/=2;
        dr/=2;
    }
    return res;
}
int main()
{
    InParser fin("arbint.in");
    OutParser fout("arbint.out");
    fin >> n >> m;

    for (int i = 0; i<n ; ++i)
        fin >> arb[i + n];
    build();
    for (int i = 1; i<=m; ++i)
    {
        int instr , pos , x;
        fin >> instr >> pos >> x;
        if (instr==1)
        {
            --pos;
            arb[pos+=n] = x;
            update(pos);
        }
        else fout << query(pos,x) << '\n';
    }

    return 0;
}