java 代码
import java.util.Arrays;
import java.util.Scanner;
public class Main {
public static void main(String[] args) {
Scanner s=new Scanner(System.in);
int n=s.nextInt();
int a[]=new int [n];
for(int i=0;i<n;i++) {
a[i]=s.nextInt();
}Arrays.sort(a);
System.out.print(a[0]+" ");
for(int j=1;j<n;j++) {
if(a[j-1]!=a[j]) {
System.out.print(a[j]+" ");
}
}
}
}