#include <cstdio>
#include <climits>
int v[100000];
int main()
{
    int n,m;
    freopen("arbint.in","r",stdin);
    freopen("arbint.out","w",stdout);
    scanf("%d%d",&n,&m);
    for(int i =1; i<=n; i++)
        scanf("%d",&v[i]);
    for(int i =0; i<m; i++)
    {
        int x,a,b;
        scanf("%d%d%d",&x,&a,&b);
        if(!x)
        {
            int max = -INT_MAX;
            for(int j = a; j<=b;j++)
                if(v[j]>max)
                    max = v[j];
            printf("%d\n",max);
        }
        else
            v[a] = b;
    }
    return 0;
}