Summary:

Suppose we are given a string S with N number of elements in it. The task is to find all the possible permutations of a given string using Java code.

Solution:

Explanation:

Recursive Permutation Function:

The permute method recursively generates permutations of the input string s, appending each permutation to the result list ans.

Base Cases:

• When the length of the current permutation matches the length of the input string, it's added to the result list.

• When the index reaches the length of the input string, the method returns without further processing.

Permutation Generation:

For each character in the input string, it explores two possibilities: including it in the current permutation or excluding it.

Recursion and Backtracking:

• After including a character in the permutation, it calls itself recursively with the updated parameters.

• Backtracking is employed by marking characters as visited (vis) and unvisited after each recursive call.

Generating Permutations:

The permutation method initializes an empty list and calls permute to generate permutations.

It sorts the list of permutations in lexicographically sorted order before returning it.

Answered by: >user_5sdh3t87opj

Credit:> >Geeksforgeeks

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