#include<stdio.h>
#define nmax 100005
#define pmax 263000
long a, b, poz, x, i, n, m, rez, op;
long vmax[pmax];

void update(long st, long dr, long nod)
{
    long mjc;
    if (st==dr)
        vmax[nod]=x;
    else
    {
        mjc=(st+dr)/2;
        if (poz<=mjc)
            update(st,mjc,2*nod);
        else
            update(mjc+1,dr,2*nod+1);
        if (vmax[2*nod]>vmax[2*nod+1])
            vmax[nod]=vmax[2*nod];
        else
            vmax[nod]=vmax[2*nod+1];
    }
}

void query(long st, long dr, long nod)
{
    long mjc;
    if ((a<=st)&&(dr<=b))
    {
        if (vmax[nod]>rez)
            rez=vmax[nod];
    }
    else
    {
        mjc=(st+dr)/2;
        if (a<=mjc)
            query(st,mjc,2*nod);
        if (b>=mjc+1)
            query(mjc+1,dr,2*nod+1);
    }
}

int main()
{
    freopen("arbint.in","r",stdin);
    freopen("arbint.out","w",stdout);
    scanf("%ld %ld",&n,&m);
    for (i=1;i<=n;i++)
    {
        scanf("%ld",&x);
        poz=i;
        update(1,n,1);
    }
    for (i=1;i<=m;i++)
    {
        scanf("%ld %ld %ld",&op,&a,&b);
        if (op==0)
        {
            rez=-1;
            query(1,n,1);
            printf("%ld\n",rez);
        }
        if (op==1)
        {   poz=a;  x=b;    update(1,n,1);  }
    }
    return 0;
}