Given a string str, the task is to print all the sub-sequences of str.
A subsequence is a sequence that can be derived from another sequence by deleting some or no elements without changing the order of the remaining elements.
Input: str = “abc”
Output: a b ab c ac bc abc
Input: str = “geek”
Output: g e ge e ge ee gee k gk ek gek ek gek eek geek
Approach: Write a recursive function that prints every sub-sequence of the sub-string starting from the second character str[1, n – 1] after appending the first character of the string str in the beginning of every sub-sequence. Terminating condition will be when the passed string is empty, in that case the function will return an empty arraylist.
Below is the implementation of the above approach:
g e ge e ge ee gee k gk ek gek ek gek eek geek
Alternate Solution: One by one fix characters and recursively generate all subsets starting from them.
c b bc a ac ab abc
- Print all subsequences of a string
- Print all subsequences of a string | Iterative Method
- Print all permutation of a string using ArrayList
- Convert an ArrayList of String to a String array in Java
- Count subsequences in first string which are anagrams of the second string
- Count of 'GFG' Subsequences in the given string
- Number of subsequences in a string divisible by n
- Number of subsequences as "ab" in a string repeated K times
- Number of ways to partition a string into two balanced subsequences
- Minimum number of palindromic subsequences to be removed to empty a binary string
- Given a number as a string, find the number of contiguous subsequences which recursively add up to 9 | Set 2
- Given a number as a string, find the number of contiguous subsequences which recursively add up to 9
- Print all possible ways to convert one string into another string | Edit-Distance
- ArrayList of ArrayList in Java
- Print all permutations of a string in Java
If you like GeeksforGeeks and would like to contribute, you can also write an article using contribute.geeksforgeeks.org or mail your article to email@example.com. See your article appearing on the GeeksforGeeks main page and help other Geeks.
Please Improve this article if you find anything incorrect by clicking on the "Improve Article" button below.
Improved By : Ryuga