#include <stdio.h>
#define nmax 500002
using namespace std;
int n,m,a[nmax],arb[nmax];

void q_max(int nod, int a, int b);
void _update(int nod, int x,int y);
int _max;
int li,ls,dest,val;

void citire()
{
    freopen("arbint.in","r",stdin);
    scanf("%d %d",&n,&m);
    for (int i=1;i<=n;i++)
        scanf("%d",&a[i]);
}

void main_loop()
{
    for (int i=0;i<m;i++)
    {
        int t,x,y;
        scanf("%d %d %d",&t,&x,&y);
        if (t)
        {
            dest = x;
            val = y;
            _update(1,1,n);
        }
        else
        {
            _max = a[x];
            li = x; ls = y;
            q_max(1,1,n);
            printf("%d\n",_max);
        }
    }
}

int max(int a, int b)
{
    return a>b?a:b;
}

void _update(int nod, int x,int y)
{
    int left    = (nod << 1),
        right   = (nod << 1) +1,
        mid     = (x+y)>>1;

    if (x>y)
        return ;
    if (x == y && x == dest)
    {
        arb[nod] = val;
        a[dest] = val;
        return;
    }
    if (dest <= mid)
        _update(left,x,mid);
    else
        _update(right,mid+1,y);
    arb[nod] = max(arb[left],arb[right]);

}

// nod contine intervalul [a,b]
// intervalul cautat este [x,y]

void q_max(int nod, int a, int b)
{

    int left    = (nod << 1),
        right   = (nod << 1) +1,
        mid     = (a+b)>>1;

    if (a>b)
        return;

    // daca intervalul [x,y] este inclus in [a,b]
    if (a >= li && b <= ls)
    {
        // verificam maximul
        _max = arb[nod]>_max?arb[nod]:_max;
        return;
    }

    if (li<=mid && ls>=left)
        q_max(left,a,mid);
    if (ls>mid && li<=right)
        q_max(right,mid+1,b);
}

void build(int nod,int x, int y)
{
    int left    = (nod << 1),
        right   = (nod << 1) +1,
        mid     = (x+y)>>1;

    if (x>y)
        return;

    if (x == y)
    {
        arb[nod] = a[x];
        return;
    }
    build(left,x,mid);
    build(right,mid+1,y);
    arb[nod] = max(arb[left],arb[right]);

}

int main()
{
    freopen("arbint.out","w",stdout);
    citire();
    build(1,1,n);
    main_loop();
    return 0;
}