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Complete the combinations function to generate all combinations of the characters in the string s with length k recursively

Complete the combinations function to generate all combinations of the characters in the string s with length k recursively

Computer Networking: A Top-Down Approach (7th Edition)
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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Complete the combinations function to generate all combinations of the characters in the string s with length k recursively 

9 00 1 2 3 4 5 6 7 8 9 :1 12345G 00 public static ArrayList<String> combinations (String s, int k) { return combinations("", s, k); -2 40 5 =6 7 8 =9 -0 -1 -2 -3 -4 -5 6 -7 8 -9 -0 1 -2 30 /** * Generate all combinations of the characters in the string s with length * k. * * @param s * -4 5 6 a string. * @param k * 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} * * * * * * * </code> */ combinations ("A", "BC", 2) -> A before {BC, B, C, ""} -> {AB, AC} } combinations ("", "BC", 2) -> "" before {BC, B, C, ""} -> {BC} private static ArrayList<String> combinations (String prefix, String rest, int k) { return null; U L
Transcribed Image Text:9 00 1 2 3 4 5 6 7 8 9 :1 12345G 00 public static ArrayList<String> combinations (String s, int k) { return combinations("", s, k); -2 40 5 =6 7 8 =9 -0 -1 -2 -3 -4 -5 6 -7 8 -9 -0 1 -2 30 /** * Generate all combinations of the characters in the string s with length * k. * * @param s * -4 5 6 a string. * @param k * 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} * * * * * * * </code> */ combinations ("A", "BC", 2) -> A before {BC, B, C, ""} -> {AB, AC} } combinations ("", "BC", 2) -> "" before {BC, B, C, ""} -> {BC} private static ArrayList<String> combinations (String prefix, String rest, int k) { return null; U L
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