The both alternatives don't pass the test but work correctly for me...
package en.codegym.task.pro.task05.task0508;
import java.util.Scanner;
/*
Remove duplicate strings
*/
public class Solution {
public static String[] strings;
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
strings = new String[6];
for (int i = 0; i < strings.length; i++) {
strings[i] = sc.nextLine();
}
// Alternative 1
for (int i = 0; i < strings.length; i++) {
for (int j = 0; j < strings.length; j++){
if (i != j && strings[i].equals(strings[j])) {
strings[i] = String.valueOf(i);
strings[j] = String.valueOf(j);
}
}
if (strings[i].equals(String.valueOf(i))) strings[i] = null;
}
// Alternative 2
/*
int temp = 0;
for (int i = 0; i < strings.length; i++) {
if (strings[i] != null) {
for (int j = (i + 1); j < strings.length; j++) {
if (strings[i].equals(strings[j])) {
temp = i;
strings[j] = null;
}
}
strings[temp] = null;
}
}
*/
for (int i = 0; i < strings.length; i++) {
System.out.print(strings[i] + ", ");
}
}
}