Can you please tell me , what is logical error in it

#1

public static void subseq(String str, String result) {
if(str.length()==0) {
return ;
}

	char cc = str.charAt(0);
	String ros = str.substring(1);
	subseq(ros,result);
    subseq(ros,result+cc);
    System.out.println(result);

}
#2

Hi Vikash,
you need to put you print statement inside the if(str.length==0) block, not at last. After that you will get the correct answer but the strings won’t be in lexicographical order. So for that, store your answers in a arraylist and then sort the arraylist.

#3

sir i am not able to think of a way to add a arraylist in it , and store the elements in it , please help me

#4

public static void subseq(String str, String result) {
if (str.length() == 0) {
System.out.println(result);
return;
}

	char cc = str.charAt(0);
	String ros = str.substring(1);
	subseq(ros, result);
	subseq(ros, result + cc);

}
If you this approach you will get all the subsequences but not in lexicographical order. And for sorting the arraylist check how I have implemented it: https://ide.codingblocks.com/s/140500