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ReturnSubsequence.java

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package Others;

import java.util.Scanner;

public class ReturnSubsequence {

public static void main(String[] args) {

System.out.println("Enter String: ");

Scanner s = new Scanner(System.in);

String givenString = s.next(); // given string

String[] subsequence = returnSubsequence(givenString); // calling returnSubsequence() function

System.out.println("Subsequences : ");

// print the given array of subsequences

for (int i = 0; i < subsequence.length; i++) {

System.out.println(subsequence[i]);

}

s.close();

}

/**

* @param givenString

* @return subsequence

*/

private static String[] returnSubsequence(String givenString) {

if (givenString.length()

== 0) // If string is empty we will create an array of size=1 and insert "" (Empty string)

// in it

{

String[] ans = new String[1];

ans[0] = "";

return ans;

}

String[] SmallAns =

returnSubsequence(

givenString.substring(

1)); // recursive call to get subsequences of substring starting from index

// position=1

String[] ans =

new String

[2 * SmallAns.length]; // Our answer will be an array off string of size=2*SmallAns

int i = 0;

for (; i < SmallAns.length; i++) {

ans[i] = SmallAns[i]; // Copying all the strings present in SmallAns to ans string array

}

for (int k = 0; k < SmallAns.length; k++) {

ans[k + SmallAns.length] =

givenString.charAt(0)

+ SmallAns[

k]; // Insert character at index=0 of the given substring in front of every string

// in SmallAns

}

return ans;

}

}