Deloitte | COGNIZANT | IBM | CAPGEMINI
import java.util.Set;
import java.util.HashSet;
import java.util.Scanner;
class Solution{
public static void main(String[] args) {
Scanner sc=new Scanner(System.in);
int n=sc.nextInt();
int [] arr=new int[n];
for(int i=0;i<n;i++){
arr[i]=sc.nextInt();
}
Set<Integer> set=new HashSet<>();
for(int i=0;i<n;i++){
set.add(arr[i]);
}
System.out.println(set.size());
}
}
#subSequence
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