今天看c#plus 中的一个比较冒泡排序与 System.Array.Sort() 性能,发现System.Arry.Sort()的性能要远远的优于冒泡排序,下面代码大家有兴趣可以看一下:
1
using
System;
2
3 class SortingCompetition
4 {
5 public static void BubbleSortAscending(int [] bubbles)
6 {
7 bool swapped = true;
8
9 for (int i=0;swapped ;i++ )
10 {
11 swapped = false;
12 for (int j = 0;j<(bubbles.Length-(i+1)) ;j++ )
13 {
14 if (bubbles[j]>bubbles[j+1])
15 {
16 Swap(j,j+1,bubbles);
17 swapped = true;
18 }
19 }
20 }
21 }
22
23 public static void Swap(int first,int second,int [] arr)
24 {
25 int temp;
26
27 temp = arr[first];
28 arr[first] = arr[second];
29 arr[second] = temp;
30 }
31
32 public static void PrintArray(int [] arr)
33 {
34 for (int i=0;i<arr.Length ;i++ )
35 {
36 Console.Write("{0} ",arr[i]);
37 }
38 }
39
40 public static void Main()
41 {
42 int [] testScores = new int [200000];
43 DateTime sortStart;
44 DateTime sortEnd;
45
46 for (int i=0;i<testScores.Length ;i++ )
47 {
48 testScores[i] = testScores.Length-i;
49 }
50
51 Console.WriteLine("Now timing the bubble sort method please wait");
52 sortStart = DateTime.Now;
53 BubbleSortAscending(testScores);
54 sortEnd = DateTime.Now;
55 Console.WriteLine("Second elapsed bubble sorting an array of length {0}:{1}\n",testScores.Length,((sortEnd - sortStart).Ticks/10000000));
56
57 //PrintArray(testScores);
58
59 for (int i=0;i<testScores.Length ;i++ )
60 {
61 testScores[i] = testScores.Length-i;
62 }
63
64 Console.WriteLine("\nNow timing the built in sort method of System.Array. Please wait");
65 sortStart = DateTime.Now;
66 Array.Sort(testScores);
67 sortEnd = DateTime.Now;
68 Console.WriteLine("Seconds elapsed .NET sorting an arry of length {0}:{1}\n",testScores.Length,(((sortEnd - sortStart).Ticks/10000000)));
69
70 //PrintArray(testScores);
71 }
72}
2
3 class SortingCompetition
4 {
5 public static void BubbleSortAscending(int [] bubbles)
6 {
7 bool swapped = true;
8
9 for (int i=0;swapped ;i++ )
10 {
11 swapped = false;
12 for (int j = 0;j<(bubbles.Length-(i+1)) ;j++ )
13 {
14 if (bubbles[j]>bubbles[j+1])
15 {
16 Swap(j,j+1,bubbles);
17 swapped = true;
18 }
19 }
20 }
21 }
22
23 public static void Swap(int first,int second,int [] arr)
24 {
25 int temp;
26
27 temp = arr[first];
28 arr[first] = arr[second];
29 arr[second] = temp;
30 }
31
32 public static void PrintArray(int [] arr)
33 {
34 for (int i=0;i<arr.Length ;i++ )
35 {
36 Console.Write("{0} ",arr[i]);
37 }
38 }
39
40 public static void Main()
41 {
42 int [] testScores = new int [200000];
43 DateTime sortStart;
44 DateTime sortEnd;
45
46 for (int i=0;i<testScores.Length ;i++ )
47 {
48 testScores[i] = testScores.Length-i;
49 }
50
51 Console.WriteLine("Now timing the bubble sort method please wait");
52 sortStart = DateTime.Now;
53 BubbleSortAscending(testScores);
54 sortEnd = DateTime.Now;
55 Console.WriteLine("Second elapsed bubble sorting an array of length {0}:{1}\n",testScores.Length,((sortEnd - sortStart).Ticks/10000000));
56
57 //PrintArray(testScores);
58
59 for (int i=0;i<testScores.Length ;i++ )
60 {
61 testScores[i] = testScores.Length-i;
62 }
63
64 Console.WriteLine("\nNow timing the built in sort method of System.Array. Please wait");
65 sortStart = DateTime.Now;
66 Array.Sort(testScores);
67 sortEnd = DateTime.Now;
68 Console.WriteLine("Seconds elapsed .NET sorting an arry of length {0}:{1}\n",testScores.Length,(((sortEnd - sortStart).Ticks/10000000)));
69
70 //PrintArray(testScores);
71 }
72}
上例中对一个长度为200000的数组进行排序,冒泡法用去107秒,System.Array.Sort()确用了不到1秒的时间,性能的差距太大了,有谁知道System.Array.Sort()用的什么排序法,欢迎大家讨论。