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
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Improved By : Ryuga