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Print Subsequence

 1. You are given a string str.

2. Complete the body of printSS function - without changing signature - to calculate and print all subsequences of str.

Use sample input and output to take idea about subsequences..

Input Format

A string str

Output Format

Subsequences of str in order hinted by Sample output

Constraints

0 <= str.length <= 7

Sample Input

yvTA


Sample Output

yvTA

yvT

yvA

yv

yTA

yT

yA

y

vTA

vT

vA

v

TA

T

A

Solution:


import java.io.*;
import java.util.*;

public class Main {

    public static void main(String[] args) throws Exception {
        Scanner sc = new Scanner(System.in);
        String str = sc.nextLine();
        printSS(str,"");
    }

    public static void printSS(String str, String ans) {
        if(str.length() == 0){
            System.out.println(ans);
            return;
        }
        char ch = str.charAt(0);
        String substr = str.substring(1);
        printSS(substr,ans+ch);
        printSS(substr,ans);
    }

}
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