/** * Generate all combinations of the characters in the string s with length * k. * * @param * a string. * @param k * the length of the combinations * @return a list of all of the combinations of the strings in s. */ public static ArrayList combinations (String s, int k) { return combinations ("", s, k); }| /** * 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. * * * 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) -> "" before {BC, B, C, ""} -> {BC}

/** * Generate all combinations of the characters in the string s with length * k. * * @param * a string. * @param k * the length of the combinations * @return a list of all of the combinations of the strings in s. */ public static ArrayList combinations (String s, int k) { return combinations ("", s, k); }| /** * 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. * * 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) -> "" before {BC, B, C, ""} -> {BC}

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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