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59 lines (54 loc) · 1.83 KB
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/*
This program will return all the subsequences of the input string in a string array;
Sample Input:
abc
Sample Output:
"" ( Empty String )
c
b
bc
a
ac
ab
abc
*/
import java.util.Scanner;
public class ReturnSubsequence {
/*
Main function will accept the given string and implement return subsequences function
*/
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 : ");
for(int i=0;i<subsequence.length;i++) //print the given array of subsequences
{
System.out.println(subsequence[i]);
}
}
/*
Recursive function to return Subsequences
*/
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;
}
}