[java] How to efficiently remove duplicates from an array without using Set

  public static void main(String[] args) { 
            int input[] = { 1, 5, 1, 0, -3, 1, -3, 2, 1 }; 
            int j = 0; 
            int output[] = new int[100]; 
            Arrays.fill(a, 0); 
            for (int i = 0; i < 9; i++) { 
                    if (output[input[i]] == 0) {
                            input[j++] = input[i]; 
                            output[input[i]]++; 
                    } 
            } 
            for (int i = 0; i < j; i++) { 
                    System.out.print(input[i] + " "); 
            } 
    }

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