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C# 经典排序算法大全-CSDN博客

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文章浏览阅读84次。C# 经典排序算法大全选择排序using System;using System.Collections.Generic;using System.Linq;using System.Text;namespace sorter{ public class SelectionSorter { private int min; …_c# case复杂排序

C# 经典排序算法大全

选择排序

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using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

namespace sorter

{

public class SelectionSorter

{

private int min;

public void Sort(int[] arr)

{

for (int i = 0; i < arr.Length - 1; ++i)

{

min = i;

for (int j = i + 1; j < arr.Length; ++j)

{

if (arr[j] < arr[min])

{

min = j;

}

}

int t = arr[min];

arr[min] = arr[i];

arr[i] = t;

}

}

}

class Program

{

static void Main(string[] args)

{

int[] arrInt = new int[] { 4, 2, 7, 1, 8, 3, 9, 0, 5, 6 };

SelectionSorter selSor = new SelectionSorter();

selSor.Sort(arrInt);

foreach (int i in arrInt)

{

Console.WriteLine(i);

}

Console.ReadKey();

}

}

}

冒泡排序

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using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

namespace sorter

{

public class EbullitionSorter

{

public void Sort(int[] arr)

{

int i, j, temp;

bool done = false;

j = 1;

while ((j < arr.Length) && (!done))

{

done = true;

for (i = 0; i < arr.Length - j; i++)

{

if (arr[i] > arr[i + 1])

{

done = false;

temp = arr[i];

arr[i] = arr[i + 1];

arr[i + 1] = temp;

}

}

j++;

}

}

}

class Program

{

static void Main(string[] args)

{

int[] arrInt = new int[] { 4, 2, 7, 1, 8, 3, 9, 0, 5, 6 };

EbullitionSorter selSor = new EbullitionSorter();

selSor.Sort(arrInt);

foreach (int i in arrInt)

{

Console.WriteLine(i);

}

Console.ReadKey();

}

}

}

高速排序

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using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

namespace sorter

{

public class QuickSorter

{

private void swap(ref int l, ref int r)

{

int temp;

temp = l;

l = r;

r = temp;

}

public void Sort(int[] list, int low, int high)

{

int pivot;

int l, r;

int mid;

if (high <= low)

{

return;

}

else if (high == low + 1)

{

if (list[low] > list[high])

{

swap(ref list[low], ref list[high]);

}

return;

}

mid = (low + high) >> 1;

pivot = list[mid];

swap(ref list[low], ref list[mid]);

l = low + 1;

r = high;

do

{

while (l <= r && list[l] < pivot)

{

l++;

}

while (list[r] >= pivot)

{

r--;

}

if (l < r)

{

swap(ref list[l], ref list[r]);

}

} while (l < r);

list[low] = list[r];

list[r] = pivot;

if (low + 1 < r)

{

Sort(list, low, r - 1);

}

if (r + 1 < high)

{

Sort(list, r + 1, high);

}

}

}

class Program

{

static void Main(string[] args)

{

int[] arrInt = new int[] { 4, 2, 7, 1, 8, 3, 9, 0, 5, 6 };

QuickSorter selSor = new QuickSorter();

selSor.Sort(arrInt, 0, arrInt.Length - 1);

foreach (int i in arrInt)

{

Console.WriteLine(i);

}

Console.ReadKey();

}

}

}

插入排序

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using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

namespace sorter

{

public class InsertionSorter

{

public void Sort(int[] arr)

{

for (int i = 1; i < arr.Length; i++)

{

int t = arr[i];

int j = i;

while ((j > 0) && (arr[j - 1] > t))

{

arr[j] = arr[j - 1];

--j;

}

arr[j] = t;

}

}

}

class Program

{

static void Main(string[] args)

{

int[] arrInt = new int[] { 4, 2, 7, 1, 8, 3, 9, 0, 5, 6 };

InsertionSorter selSor = new InsertionSorter();

selSor.Sort(arrInt);

foreach (int i in arrInt)

{

Console.WriteLine(i);

}

Console.ReadKey();

}

}

}

希尔排序

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using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

namespace sorter

{

public class ShellSorter

{

public void Sort(int[] arr)

{

int inc;

for (inc = 1; inc <= arr.Length / 9; inc = 3 * inc + 1) ;

for (; inc > 0; inc /= 3)

{

for (int i = inc + 1; i <= arr.Length; i += inc)

{

int t = arr[i - 1];

int j = i;

while ((j > inc) && (arr[j - inc - 1] > t))

{

arr[j - 1] = arr[j - inc - 1];

j -= inc;

}

arr[j - 1] = t;

}

}

}

}

class Program

{

static void Main(string[] args)

{

int[] arrInt = new int[] { 4, 2, 7, 1, 8, 3, 9, 0, 5, 6 };

ShellSorter selSor = new ShellSorter();

selSor.Sort(arrInt);

foreach (int i in arrInt)

{

Console.WriteLine(i);

}

Console.ReadKey();

}

}

}

归并排序

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using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

namespace Merge

{

public class Function

{

private int Groups;

private int CopyGroups;

private int mergerows;

private int[] Array27;

private static Random ran = new Random();

public Function(int length)

{

Array27 = new int[length];

for (int i = 0; i < length; i++)

Array27[i] = ran.Next(1, 100);

}

public void ToMergeSort()

{

MergeSort(Array27);

}

public void ToRecursiveMergeSort()

{

RecursiveMergeSort(Array27, 0, Array27.Length - 1);

}

public void ToNaturalMergeSort()

{

NaturalMergeSort(Array27);

}

public void RecursiveMergeSort(int[] Array, int left, int right)

{

int middle = (left + right) / 2;

if (left < right)

{

RecursiveMergeSort(Array, left, middle);

RecursiveMergeSort(Array, middle + 1, right);

MergeOne(Array, left, middle, right);

}

}

public void MergeOne(int[] Array, int left, int middle, int right)

{

int leftindex = left;

int rightindex = middle + 1;

int[] merge = new int[right + 1];

int index = 0;

while (leftindex <= middle && rightindex <= right)

merge[index++] = (Array[leftindex] - Array[rightindex]) >= 0 ? Array[rightindex++] : Array[leftindex++];

if (leftindex <= middle)

{

for (int i = leftindex; i <= middle; i++)

merge[index++] = Array[i];

}

if (rightindex <= right)

{

for (int i = rightindex; i <= right; i++)

merge[index++] = Array[i];

}

index = 0;

for (int i = left; i <= right; i++)

Array[i] = merge[index++];

}

public void MergeSort(int[] Array)

{

int[] merge = new int[Array.Length];

int P = 0;

while (true)

{

int index = 0;

int ENumb = (int)Math.Pow(2, P);

if (ENumb < Array.Length)

{

while (true)

{

int TorFAndrightindex = index;

if (TorFAndrightindex <= Array.Length - 1)

MergeTwo(Array, merge, index, ENumb);

else

break;

index += 2 * ENumb;

}

}

else

break;

P++;

}

}

public void MergeTwo(int[] Array, int[] merge, int index, int ENumb)

{

int left = index;

int middle = left + ENumb - 1;

if (middle >= Array.Length)

{

middle = index;

}

int mergeindex = index;

int right;

int middleTwo = (index + ENumb - 1) + 1;

right = index + ENumb + ENumb - 1;

if (right >= Array.Length - 1)

{

right = Array.Length - 1;

}

while (left <= middle && middleTwo <= right)

{

merge[mergeindex++] = Array[left] >= Array[middleTwo] ? Array[middleTwo++] : Array[left++];

}

if (left <= middle)

{

while (left <= middle && mergeindex < merge.Length)

merge[mergeindex++] = Array[left++];

}

if (middleTwo <= right)

{

while (middleTwo <= right)

merge[mergeindex++] = Array[middleTwo++];

}

if (right + 1 >= Array.Length)

Copy(Array, merge);

}

public void NaturalMergeSort(int[] Array)

{

int[,] PointsSymbol = LinearPoints(Array);

if (PointsSymbol[0, 1] == Array.Length - 1)

return;

else

NaturalMerge(Array, PointsSymbol);

}

public void NaturalMerge(int[] Array, int[,] PointsSymbol)

{

int left;

int right;

int leftend;

int rightend;

mergerows = GNumberTwo(Groups);

CopyGroups = Groups;

int[] TempArray = new int[Array.Length];

while (true)

{

int[,] TempPointsSymbol = new int[mergerows, 2];

int row = 0;

do

{

if (row != CopyGroups - 1)

{

left = PointsSymbol[row, 0];

leftend = PointsSymbol[row, 1];

right = PointsSymbol[row + 1, 0];

rightend = PointsSymbol[row + 1, 1];

MergeThree(Array, TempArray, left, leftend, right, rightend);

MergePointSymbol(PointsSymbol, TempPointsSymbol, row);

}

else

{

默认剩下的单独一个子数组已经虚拟合并。然后Copy进TempArray。

int TempRow = PointsSymbol[row, 0];

int TempCol = PointsSymbol[row, 1];

while (TempRow <= TempCol)

TempArray[TempRow] = Array[TempRow++];

TempPointsSymbol[row / 2, 0] = PointsSymbol[row, 0];

TempPointsSymbol[row / 2, 1] = PointsSymbol[row, 1];

break;

}

row += 2;

if (TempPointsSymbol[0, 1] == Array.Length - 1)

break;

}

while (row <= CopyGroups - 1);

Copy(Array, TempArray);

UpdatePointSymbol(PointsSymbol, TempPointsSymbol, row);

mergerows = GNumber(mergerows);

CopyGroups = GNumberTwo(CopyGroups);

if (PointsSymbol[0, 1] == Array.Length - 1)

break;

}

}

public int GNumber(int Value)

{

if (Value % 2 == 0)

Value /= 2;

else

Value -= 1;

return Value;

}

public int GNumberTwo(int Value)

{

if (Value % 2 == 0)

mergerows = Value / 2;

else

mergerows = Value / 2 + 1;

return mergerows;

}

public void MergeThree(int[] Array, int[] Temp, int left, int leftend, int right, int rightend)

{

int index = left;

while (left <= leftend && right <= rightend)

Temp[index++] = Array[left] >= Array[right] ? Array[right++] : Array[left++];

while (left <= leftend)

Temp[index++] = Array[left++];

while (right <= rightend)

Temp[index++] = Array[right++];

}

public void MergePointSymbol(int[,] PointsSymbol, int[,] TempPointsSymbol, int row)

{

int rowindex = row / 2;

TempPointsSymbol[rowindex, 0] = PointsSymbol[row, 0];

TempPointsSymbol[rowindex, 1] = PointsSymbol[row + 1, 1];

}

public void UpdatePointSymbol(int[,] PointsSymbol, int[,] TempPointsSymbol, int rows)

{

int row = 0;

for (; row < TempPointsSymbol.GetLength(0); row++)

{

for (int col = 0; col < 2; col++)

PointsSymbol[row, col] = TempPointsSymbol[row, col];

}

for (; row < PointsSymbol.GetLength(0); row++)

{

for (int col2 = 0; col2 < 2; col2++)

PointsSymbol[row, col2] = 0;

}

补剩下的index组，

// int row3 = TempPointsSymbol.GetLength(0); // PointsSymbol[row3, 0] = PointsSymbol[rows, 0]; // PointsSymbol[row3, 1] = PointsSymbol[rows, 1]; // //后面的清零 // for (int row4 = row3 + 1; row4 < PointsSymbol.GetLength(0); row4++) // { // for (int col4 = 0; col4 < 2; col4++) // PointsSymbol[row4, col4] = 0; // } //} } public int[,] LinearPoints(int[] Array) { Groups = 1; int StartPoint = 0; int row = 0; int col = 0; //最糟糕的情况就是有Array.Length行。 int[,] PointsSet = new int[Array.Length, 2]; //线性扫描Array，划分数组 //初始前index=0 PointsSet[row, col] = 0; do { //推断升序子数组终于的index开关 bool Judge = false; //从Array第二个数推断是否要结束或者是否是升序子数组. while (++StartPoint < Array.Length && Array[StartPoint] < Array[StartPoint - 1]) { //打开第一个升序子数组结束的index开关 Judge = true; //又一次開始第二个升序子数组的前index PointsSet[row, col + 1] = StartPoint - 1; //计算子数组个数 Groups++; //换行记录自然子数组的index row++; break; //–StartPoint; } //升序子数组结束index if (Judge) PointsSet[row, col] = StartPoint; //else // –StartPoint; } while (StartPoint < Array.Length); //终于index=StartPoint - 1，可是糟糕情况下还有剩余若干行为： 0,0 … PointsSet[row, col + 1] = StartPoint - 1; //调用展示方法 DisplaySubarray(Array, PointsSet, Groups); return PointsSet; } public void DisplaySubarray(int[] Array, int[,] PointsSet, int Groups) { Console.WriteLine(“Subarray is {0}:”, Groups); //展示子数组的前后index for (int r = 0; r < Groups; r++) { for (int c = 0; c < PointsSet.GetLength(1); c++) { Console.Write(PointsSet[r, c]); if (c < PointsSet.GetLength(1) - 1) Console.Write(“,”); } Console.Write(“\t\t”); } Console.WriteLine(); //展示分出的子数组 for (int v = 0; v < Groups; v++) { int i = 1; for (int r = PointsSet[v, 0]; r <= PointsSet[v, 1]; r++) { Console.Write(Array[r] + “ “); i++; } if (i <= 3) Console.Write(“\t\t”); else Console.Write(“\t”); if (PointsSet[v, 1] == Array.Length) break; } } public void Copy(int[] Array, int[] merge) { //一部分排好序的元素替换掉原来Array中的元素 for (int i = 0; i < Array.Length; i++) { Array[i] = merge[i]; } } //输出 public override string ToString() { string temporary = string.Empty; foreach (var element in Array27) temporary += element + “ “; temporary += “\n”; return temporary; } } class Program { static void Main(string[] args) { while (true) { Console.WriteLine(“请选择：”); Console.WriteLine(“1.归并排序（非递归）”); Console.WriteLine(“2.归并排序（递归）”); Console.WriteLine(“3.归并排序（自然合并）”); Console.WriteLine(“4.退出”); int Arraynum = Convert.ToInt32(Console.ReadLine()); switch (Arraynum) { case 4: Environment.Exit(0); break; case 1: Console.WriteLine(“Please Input Array Length”); int Leng271 = Convert.ToInt32(Console.ReadLine()); Function obj1 = new Function(Leng271); Console.WriteLine(“The original sequence:”); Console.WriteLine(obj1); Console.WriteLine(“‘MergeSort’ Finaly Sorting Result:”); obj1.ToMergeSort(); Console.WriteLine(obj1); break; case 2: Console.WriteLine(“Please Input Array Length”); int Leng272 = Convert.ToInt32(Console.ReadLine()); Function obj2 = new Function(Leng272); Console.WriteLine(“The original sequence:”); Console.WriteLine(obj2); Console.WriteLine(“‘RecursiveMergeSort’ Finaly Sorting Result:”); obj2.ToRecursiveMergeSort(); Console.WriteLine(obj2); break; case 3: Console.WriteLine(“Please Input Array Length”); int Leng273 = Convert.ToInt32(Console.ReadLine()); Function obj3 = new Function(Leng273); Console.WriteLine(“The original sequence:”); Console.WriteLine(obj3); obj3.ToNaturalMergeSort(); Console.WriteLine(); Console.WriteLine(); Console.WriteLine(“‘NaturalMergeSort’ Finaly Sorting Result:”); Console.WriteLine(obj3); break; } } } } }

基数排序

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using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

namespace Merge

{

public class RadixSorter

{

public int[] RadixSort(int[] ArrayToSort, int digit)

{

for (int k = 1; k <= digit; k++)

{

int[] tmpArray = new int[ArrayToSort.Length];

int[] tmpCountingSortArray = new int[10] { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };

for (int i = 0; i < ArrayToSort.Length; i++)

{

int tmpSplitDigit = ArrayToSort[i] / (int)Math.Pow(10, k - 1) - (ArrayToSort[i] / (int)Math.Pow(10, k)) * 10;

tmpCountingSortArray[tmpSplitDigit] += 1;

}

for (int m = 1; m < 10; m++)

{

tmpCountingSortArray[m] += tmpCountingSortArray[m -

1];

}

for (int n = ArrayToSort.Length - 1; n >= 0; n--)

{

int tmpSplitDigit = ArrayToSort[n] / (int)Math.Pow(10, k - 1) -

(ArrayToSort[n] / (int)Math.Pow(10, k)) * 10;

tmpArray[tmpCountingSortArray[tmpSplitDigit] - 1] = ArrayToSort

[n];

tmpCountingSortArray[tmpSplitDigit] -= 1;

}

for (int p = 0; p < ArrayToSort.Length; p++)

{

ArrayToSort[p] = tmpArray[p];

}

}

return ArrayToSort;

}

}

class Program

{

static void Main(string[] args)

{

int[] intArray = new int[] { 5, 3, 7, 4, 8, 2, 9, 1, 0, 6 };

int[] newIntArray = intArray;

RadixSorter rS=new RadixSorter();

newIntArray = rS.RadixSort(intArray, intArray.Length);

foreach (int i in intArray)

{

Console.Write(i + " ");

}

Console.ReadKey();

}

}

}

计数排序

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using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

namespace Merge

{

class Program

{

/// 要求: /// arrayToSort的元素必须大于等于0。或者经过一定的转换使其元素在 /// 大于等于0范围内。比如有例如以下序列(-1,-8,10,11),那么依据最小值8, /// 将各个数字加8转化为(7,0,18,19),然后进行计数排序。结果为(0,7,18,19), /// 然后再将结果个数字减8即为(-8,-1,10,11) /// /// 要排序的数组 /// 数组的最大值加一 /// 计数排序后的结果 public static int[] CountingSort(int[] arrayToSort, int k) { // 排序后的结果存储 int[] sortedArray = new int[arrayToSort.Length]; // 计数数组 int[] countingArray = new int[k]; // 计数数组初始化 for (int i = 0; i < countingArray.Length; i++) { countingArray[i] = 0; } // 单个元素计数(经过该步骤countingArray[i]的含义为数字i的个数为countingArray[i]) for (int i = 0; i < arrayToSort.Length; i++) { countingArray[arrayToSort[i]] = countingArray[arrayToSort[i]] + 1; } // 计算小于等于某数的个数(经过该步骤countingArray[i]的含义为小于等于数字i的元素个数为countingArray[i]) for (int i = 1; i < countingArray.Length; i++) { countingArray[i] += countingArray[i - 1]; } // 得到排序后的结果 for (int i = 0; i < sortedArray.Length; i++) { int numIndex = countingArray[arrayToSort[i]] - 1; sortedArray[numIndex] = arrayToSort[i]; countingArray[arrayToSort[i]] = countingArray[arrayToSort[i]] - 1; } return sortedArray; } static void Main(string[] args) { int[] intArray = new int[] { 5, 3, 7, 4, 8, 2, 9, 1, 0, 6 }; int[] intNewArray = intArray; intNewArray = CountingSort(intArray, intArray.Length); foreach (int i in intNewArray) { Console.Write(i + “ “); } Console.ReadKey(); } } }

堆排序

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using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

namespace Merge

{

class Program

{

private static void HeapSortFunction(int[] array)

{

try

{

BuildMaxHeap(array);

for (int i = array.Length - 1; i > 0; i--)

{

Swap(ref array[0], ref array[i]);

MaxHeapify(array, 0, i);

}

}

catch (Exception ex)

{

Console.Write(ex.Message);

}

}

private static void BuildMaxHeap(int[] array)

{

try

{

for (int i = array.Length / 2 - 1; i >= 0; i--)

{

MaxHeapify(array, i, array.Length);

}

}

catch (Exception ex)

{

Console.Write(ex.Message);

}

}

private static void MaxHeapify(int[] array, int currentIndex, int heapSize)

{

try

{

int left = 2 * currentIndex + 1;

int right = 2 * currentIndex + 2;

int large = currentIndex;

if (left < heapSize && array[left] > array[large])

{

large = left;

}

if (right < heapSize && array[right] > array[large])

{

large = right;

}

if (currentIndex != large)

{

Swap(ref array[currentIndex], ref array[large]);

MaxHeapify(array, large, heapSize);

}

}

catch (Exception ex)

{

Console.Write(ex.Message);

}

}

private static void Swap(ref int a, ref int b)

{

int temp = 0;

temp = a;

a = b;

b = temp;

}

static void Main(string[] args)

{

int[] intArray = new int[] { 5, 3, 7, 4, 8, 2, 9, 1, 0, 6 };

HeapSortFunction(intArray);

foreach (int i in intArray)

{

Console.Write(i + " ");

}

Console.ReadKey();

}

}

}

排序的分类/稳定性/时间复杂度和空间复杂度总结

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