#include<cstdio>
#include<cstdlib>
FILE *f=fopen("arbint.in","r"),*g=fopen("arbint.out","w");
int n,m,valmax,arb[300000];
int maxim(int x,int y)
{
       if(x>y)
       return x;
       return y;
}
void UpdateArb(int nod,int st,int dr,int index,int value)
{
     int mij;
     if(st==dr)
     {
               arb[nod]=value;
               return;
     }
     mij=(st+dr)/2;
     if(index<=mij)
                   UpdateArb(nod*2,st,mij,index,value);
     else
                   UpdateArb(nod*2+1,mij+1,dr,index,value);
     arb[nod]=maxim(arb[nod*2],arb[nod*2+1]);     
}

void QueryArb(int nod,int st,int dr,int a, int b)
{
    int mij;
    if(a<=st && dr<=b)
    {
             if(valmax<arb[nod])
             valmax=arb[nod];
             return;
    }
    mij=(st+dr)/2;
    if(a<=mij)
    QueryArb(nod*2,st,mij,a,b);
    if(b>mij)
    QueryArb(nod*2+1,mij+1,dr,a,b);
}

int main()
{
    
    int i,op,x,y;
    fscanf(f,"%d%d",&n,&m);
    for(i=1;i<=n;i++)
    {
                    fscanf(f,"%d",&x);
                    UpdateArb(1,1,n,i,x);
    }
    for(i=1;i<=m;i++)
    {
                    fscanf(f,"%d%d%d",&op,&x,&y);
                    if(op==0)
                    {
                             valmax=-1;
                             QueryArb(1,1,n,x,y);
                             fprintf(g,"%d\n",valmax);
                    }
                    if(op==1)
                    {
                             UpdateArb(1,1,n,x,y);
                    }
    }

    fclose(f);
    fclose(g);
    return 0;
}