#include <iostream>
#include  <stdio.h>

using namespace std;

FILE *f=fopen("arbint.in","r");
FILE *g=fopen("arbint.out","w");

int v[100000],i,j,mx,n,m,x,a,b;

int main()
{
    fscanf(f,"%d%d",&n,&m);
    for (i=1;i<=n;i++)
       fscanf(f,"%d",&v[i]);
    for (i=1;i<=n;i++)
        fscanf(f,"%d%d%d",&x,&a,&b);
        if (x==1) {v[a]=b;}
        if (x==0)
        {
            mx=0;
            for (j=a;j<=b;j++)
                if (v[j]>mx) mx=v[j];
            fprintf(g,"%d\n",mx);
        }

    return 0;
}