1. With the partial implementation of the "Merge-Sort" algorithm (shown below), namely, merge( ) and mergeSort(), build a test program that sorts an unsorted array of the size of 20. You may need Queue, LinkedQueue or any other classes and interfaces to import. /** Merge contents of arrays S1 and S2 into properly sized array S. */ public static void merge(K[] s1, K[] S2, K[] s, Comparator comp) { int i = 0, j = 0; while (i + j < S.length) { if (j == S2.1ength || (i < s1. length && comp.compare(S1[i], S2[j]) < e)) S[i+j] = S1[i++]; else // copy ith element of S1 and increment i // copy ith element of S2 and increment j S[i+j] = S2[j++]; } } /** Merge-sort contents of array S. */ public static void mergeSort (K[] S, Comparator comp) { int n = S.length; if (n < 2) return; // divide int mid = n/2; K[] s1 = Arrays.copy0fRange (S, e, mid); K[] s2 = Arrays.copy0fRange (S, mid, n); // conquer (with recursion) mergeSort(S1, comp); mergeSort(S2, comp); // merge results merge (S1, S2, s, comp); // array is trivially sorted // copy of first half // copy of second half // sort copy of first half // sort copy of second half // merge sorted halves back into original
1. With the partial implementation of the "Merge-Sort" algorithm (shown below), namely, merge( ) and mergeSort(), build a test program that sorts an unsorted array of the size of 20. You may need Queue, LinkedQueue or any other classes and interfaces to import. /** Merge contents of arrays S1 and S2 into properly sized array S. */ public static void merge(K[] s1, K[] S2, K[] s, Comparator comp) { int i = 0, j = 0; while (i + j < S.length) { if (j == S2.1ength || (i < s1. length && comp.compare(S1[i], S2[j]) < e)) S[i+j] = S1[i++]; else // copy ith element of S1 and increment i // copy ith element of S2 and increment j S[i+j] = S2[j++]; } } /** Merge-sort contents of array S. */ public static void mergeSort (K[] S, Comparator comp) { int n = S.length; if (n < 2) return; // divide int mid = n/2; K[] s1 = Arrays.copy0fRange (S, e, mid); K[] s2 = Arrays.copy0fRange (S, mid, n); // conquer (with recursion) mergeSort(S1, comp); mergeSort(S2, comp); // merge results merge (S1, S2, s, comp); // array is trivially sorted // copy of first half // copy of second half // sort copy of first half // sort copy of second half // merge sorted halves back into original
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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