Write a recursive function in Java /** * Generate all combinations of the characters in the string s with length k. * * @param s a string. * @param k the length of the combinations * @return a list of all of the combinations of the strings in s. */
Write a recursive function in Java /** * Generate all combinations of the characters in the string s with length k. * * @param s a string. * @param k the length of the combinations * @return a list of all of the combinations of the strings in s. */
Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
Section: Chapter Questions
Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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Question
Write a recursive function in Java
/**
* Generate all combinations of the characters in the string s with length k.
*
* @param s a string.
* @param k the length of the combinations
* @return a list of all of the combinations of the strings in s.
*/
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x 310 public static ArrayList<String> combinations(String s, int k) {
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/**
* Generate all combinations of the characters in the string s with length
* k.
*
* @param s
*
* @param k
61
a string.
the length of the combinations
* @return a list of all of the combinations of the strings in s.
*/
}
/**
* Recursive Problem Transformation:
*
* Generate all combinations of length k of the characters in rest prefixed
* with the characters in prefix. This is very similar to the subset method!
* Note k is the total length of each string in the returned ArrayList.
*
* <code>
* For example:
* combinations ("", "ABC", 2) -> "" before {AB, AC, BC}
-> {AB, AC, BC}
*
*
*
combinations ("A", "BC", 2) -> A before {BC, B, C, ""}
-> {AB, AC}
* combinations ("", "BC", 2)
*
* </code>
*/
}
private static ArrayList<String> combinations (String prefix, String rest,
int k) {
recusiveCalls++;
"" before {BC, B, C, ""}
-> {BC}
return null;
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