java数据结构和算法------合并排序 

 

 

 1 package iYou.neugle.sort;
 2 
 3 public class Merge_sort {
 4 
 5     public static void MergeSort(double[] array, int start, int end) {
 6         if (start < end) {
 7             int middle = (start + end) / 2;
 8             MergeSort(array, start, middle);
 9             MergeSort(array, middle + 1, end);
10             Merge(array, start, middle, end);
11         }
12     }
13 
14     private static void Merge(double[] array, int start, int middle, int end) {
15         int n1 = middle - start + 1;
16         int n2 = end - middle;
17         double[] L = new double[n1];
18         double[] R = new double[n2];
19         for (int i = 0; i < n1; i++) {
20             L[i] = array[start + i];
21         }
22         for (int i = 0; i < n2; i++) {
23             R[i] = array[middle + i + 1];
24         }
25         for (int i = 0, j = 0, k = start; k <= end; k++) {
26             if (j == n2 || (i < n1 && L[i] <= R[j])) {
27                 array[k] = L[i];
28                 i++;
29             } else {
30                 array[k] = R[j];
31                 j++;
32             }
33         }
34     }
35 }

 

posted @ 2014-09-02 13:24  iYou  阅读(195)  评论(0)    收藏  举报