常用Sort方法代码,CSharp代码库,德仔网

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【CSharp】常用Sort方法
作者:土豆-地瓜 / 发布于2015/1/22/ 943

	using System;
	using System.Collections.Generic;
	using System.Collections.ObjectModel;
	using System.Diagnostics;
	using System.IO;
	using System.Text;
	
	namespace SortAlgorithom
	{
	 public class SortAlgorithm<T> where T : IComparable<T>
	 {
	 Stopwatch stopwatch = new Stopwatch();
	
	 public void Sort(IList<T> collection)
	 {
	 if (collection != null)
	 {
	 stopwatch.Restart();
	 DoSort(collection);
	 stopwatch.Stop();
	 Console.WriteLine("{0}: {1}", this.ToString(), stopwatch.Elapsed);
	 }
	 }
	
	 protected virtual void DoSort(IList<T> collection)
	 {
	 // Nothing to do.
	 }
	 }
	
	 public class InsertSort<T> : SortAlgorithm<T> where T : IComparable<T>
	 {
	 protected override void DoSort(IList<T> collection)
	 {
	 T key;
	
	 for (int j = 1, i = 0; j < collection.Count; j++)
	 {
	 key = collection[j];
	 i = j - 1;
	
	 while (i > -1 && collection[i].CompareTo(key) > 0)
	 {
	 collection[i + 1] = collection[i];
	 i--;
	 }
	
	 collection[i + 1] = key;
	 }
	 }
	
	 public override string ToString()
	 {
	 return "InsertSort";
	 }
	 }
	
	 public class MergeSort<T> : SortAlgorithm<T> where T : IComparable<T>
	 {
	 protected override void DoSort(IList<T> collection)
	 {
	 DoMergeSort(collection, 0, collection.Count - 1);
	 }
	
	 private void Merge(IList<T> collection, int p, int q, int r)
	 {
	 IList<T> leftCollection = new Collection<T>();
	 IList<T> rightCollection = new Collection<T>();
	
	 int n1 = q - p + 1;
	 int n2 = r - q;
	 int i, j, k;
	
	 for (i = 0; i < n1; i++)
	 {
	 leftCollection.Add(collection[i + p]);
	 }
	 for (i = 0; i < n2; i++)
	 {
	 rightCollection.Add(collection[i + q + 1]);
	 }
	
	 for (k = p, i = 0, j = 0; i < n1 && j < n2; k++)
	 {
	 if (leftCollection[i].CompareTo(rightCollection[j]) < 0)
	 {
	 collection[k] = leftCollection[i ++];
	 }
	 else
	 {
	 collection[k] = rightCollection[j ++];
	 }
	 }
	
	 if (i < n1)
	 {
	 for (; i < n1; i++, k++)
	 {
	 collection[k] = leftCollection[i];
	 }
	 }
	 else if (j < n2)
	 {
	 for (; j < n2; j++, k++)
	 {
	 collection[k] = rightCollection[j];
	 }
	 }
	 else
	 {
	 // Nothing to do.
	 }
	 }
	
	 private void DoMergeSort(IList<T> collection, int p, int r)
	 {
	 if (p < r)
	 {
	 int q = (p + r) / 2;
	 DoMergeSort(collection, p, q);
	 DoMergeSort(collection, q + 1, r);
	 Merge(collection, p, q, r);
	 }
	 }
	
	 public override string ToString()
	 {
	 return "MergeSort";
	 }
	 }
	
	 public class HeapSort<T> : SortAlgorithm<T> where T : IComparable<T>
	 {
	 protected override void DoSort(IList<T> collection)
	 {
	 DoHeapSort(collection);
	 }
	
	 private void HeapAdjust(IList<T> collection, int s, int m)
	 {
	 T key = collection[s];
	 for (int i = s * 2 + 1; i <= m; i = i * 2 + 1)
	 {
	 if (i < m && collection[i].CompareTo(collection[i + 1]) < 0)
	 {
	 i++;
	 }
	
	 if (collection[i].CompareTo(key) < 0)
	 {
	 break;
	 }
	
	 collection[s] = collection[i];
	 s = i;
	 }
	 collection[s] = key;
	 }
	
	 private void DoHeapSort(IList<T> collection)
	 {
	 int maxIndex = collection.Count - 1;
	 int i;
	
	 for (i = maxIndex / 2; i >= 0; i--)
	 {
	 HeapAdjust(collection, i, maxIndex);
	 }
	
	 for (i = maxIndex; i > 0; i--)
	 {
	 T key = collection[0];
	 collection[0] = collection[i];
	 collection[i] = key;
	
	 HeapAdjust(collection, 0, i - 1);
	 }
	 }
	
	 public override string ToString()
	 {
	 return "HeapSort";
	 }
	 }
	
	 public class Program
	 {
	 const int DefaultSortNum = 10000;
	
	 static void Main(string[] args)
	 {
	 int sortNum;
	
	 while (true)
	 {
	 int.TryParse(Console.ReadLine(), out sortNum);
	
	 if (sortNum <= 0)
	 {
	 sortNum = DefaultSortNum;
	 }
	
	 List<int> source = Utility.GenerateNums(sortNum);
	 List<int> source1 = new List<int>(source);
	 List<int> source2 = new List<int>(source);
	 List<int> source3 = new List<int>(source);
	 List<int> source4 = new List<int>(source);
	
	 InsertSort<int> insertSort = new InsertSort<int>();
	 MergeSort<int> mergeSort = new MergeSort<int>();
	 HeapSort<int> heapSort = new HeapSort<int>();
	
	 insertSort.Sort(source1);
	 mergeSort.Sort(source2);
	 heapSort.Sort(source3);
	
	 Utility.WriteToFile(insertSort.ToString(), source1);
	 Utility.WriteToFile(mergeSort.ToString(), source2);
	 Utility.WriteToFile(heapSort.ToString(), source3);
	 }
	 }
	 }
	
	 public static class Utility
	 {
	 public static List<int> GenerateNums(int count)
	 {
	 if (count < 0)
	 {
	 return null;
	 }
	
	 List<int> result = new List<int>();
	 Random random = new Random();
	 int i = 0;
	
	 while (i++ < count)
	 {
	 result.Add(random.Next());
	 }
	
	 return result;
	 }
	
	 public static void WriteToFile(string fileName, List<int> collection)
	 {
	 using (FileStream fs = new FileStream(fileName, FileMode.OpenOrCreate, FileAccess.Write))
	 {
	 using (StreamWriter sw = new StreamWriter(fs, Encoding.UTF8))
	 {
	 foreach (int i in collection)
	 {
	 sw.WriteLine(i.ToString());
	 }
	 }
	 }
	 }
	 }
	}
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