public static void sort3ways <T>(T[] arr, int l, int r) where T : IComparable
{
if (r <= l)
{
return;
}
int lt = l, gt = r, i = l + 1;
T v = arr[l];
while (i <= gt)
{
int cmp = arr[i].CompareTo(v);
if (cmp < 0)
{
SortTestHelper.swap(arr, i, lt);
lt++;
i++;
}
else if (cmp == 0)
{
i++;
}
else
{
SortTestHelper.swap(arr, i, gt);
gt--;
}
}
sort3ways(arr, l, lt - 1);
sort3ways(arr, gt + 1, r);
}
public static int partition <T>(T[] arr, int l, int r) where T : IComparable
{
int i = l, j = r + 1;
while (true)
{
while (arr[++i].CompareTo(arr[l]) < 0)
{
if (i == r)
{
break;
}
}
while (arr[--j].CompareTo(arr[l]) > 0)
{
if (j == l)
{
break;
}
}
if (i >= j)
{
break;
}
SortTestHelper.swap(arr, i, j);
}
SortTestHelper.swap(arr, l, j);
return(j);
}
public static int partition21 <T>(T[] arr, int l, int r) where T : IComparable
{
int i = l, j = r;
while (i != j)
{
// 必须j先出动，因为j是寻找小于基准数的值，最后与基准数交换位置的值必须小于基准数的数。
while (i < j && arr[j].CompareTo(arr[l]) >= 0)
{
j--;
}
while (i < j && arr[i].CompareTo(arr[l]) <= 0)
{
i++;
}
if (i < j)
{
SortTestHelper.swap(arr, i, j);
}
}
SortTestHelper.swap(arr, j, l);
return(i);
}
public static int partition22 <T>(T[] arr, int l, int r) where T : IComparable
{
int i = l + 1, j = r;
while (true)
{
while (i <= r && arr[i].CompareTo(arr[l]) < 0)
{
i++;
}
while (j >= l + 1 && arr[j].CompareTo(arr[l]) > 0)
{
j--;
}
if (i > j)
{
break;
}
SortTestHelper.swap(arr, i, j);
i++;
j--;
}
SortTestHelper.swap(arr, l, j);
return(j);
}
public static void sort <T>(T[] arr) where T : IComparable
{
int n = arr.Length;
n = n / 2;
while (n > 0)
{
for (int i = n; i < arr.Length; i++)
{
for (int j = i; j >= n; j = j - n)
{
if (arr[j - n].CompareTo(arr[j]) > 0)
{
SortTestHelper.swap(arr, j - n, j);
}
else
{
break;
}
}
}
n = n / 2;
}
}
public static void sort <Item>(Item[] arr) where Item : IComparable
{
int n = arr.Length;
for (int i = (n - 1 - 1) / 2; i >= 0; i--)
{
sink(arr, n, i);
}
for (int j = n - 1; j > 0; j--)
{
SortTestHelper.swap(arr, 0, j);
sink(arr, j, 0);
}
}
public static void sort <T>(T[] arr) where T : IComparable
{
//循环n-1次，只需冒泡n-1个元素
for (int i = 1; i <= arr.Length - 1; i++)
{
//通过对arr[0..n-i]内的相邻元素依次进行比较并交换位置，使arr[0..n-i]中最大元素移动至arr[1,n-i]末端。
for (int j = 0; j < arr.Length - i; j++)
{
//比较相邻元素，如果arr[j-1]>arr[j]则交换位置
if (arr[j].CompareTo(arr[j + 1]) > 0)
{
SortTestHelper.swap(arr, j, j + 1);
}
}
}
}
public static void sort <T>(T[] arr) where T : IComparable
{
for (int i = 0; i < arr.Length; i++)
{
int minIndex = i;
for (int j = i; j < arr.Length; j++)
{
if (arr[j].CompareTo(arr[minIndex]) <= 0)
{
minIndex = j;
}
}
SortTestHelper.swap(arr, i, minIndex);
}
}
//单路快速排序
public static int partition1 <T>(T[] arr, int l, int r) where T : IComparable
{
int i = l + 1, j = l;
while (i <= r)
{
if (arr[i].CompareTo(arr[l]) <= 0)
{
j++;
SortTestHelper.swap(arr, j, i);
}
i++;
}
SortTestHelper.swap(arr, l, j);
return(j);
}
public static void insertSort(T[] arr, int l, int r)
{
for (int i = l + 1; i <= r; i++)
{
for (int j = i; j > l; j--)
{
if (arr[j - 1].CompareTo(arr[j]) > 0)
{
SortTestHelper.swap(arr, j - 1, j);
}
else
{
break;
}
}
}
}
public static void sortBasic <T>(T[] arr) where T : IComparable
{
for (int i = 1; i < arr.Length; i++)
{
for (int j = i; j > 0; j--)
{
if (arr[j - 1].CompareTo(arr[j]) > 0)
{
SortTestHelper.swap(arr, j - 1, j);
}
else
{
break;
}
}
}
}
public static void sink <Item>(Item[] arr, int n, int k) where Item : IComparable
{
while (k * 2 + 1 < n)
{
int j = k * 2 + 1;
if (k * 2 + 2 < n && arr[j + 1].CompareTo(arr[j]) > 0)
{
j++;
}
if (arr[j].CompareTo(arr[k]) > 0)
{
SortTestHelper.swap(arr, j, k);
k = j;
}
else
{
break;
}
}
}
static void Main(string[] args)
{
int n = 1000000;
int[] a = SortTestHelper.generateRandomArray(n, 0, n);
int[] d = SortTestHelper.generateNearlyOrderedArray(n, 100);
//SelectionSort.sort(a);
//SortTestHelper.printArray(a);
int[] b = new int[a.Length];
int[] c = new int[a.Length];
int[] e = new int[a.Length];
int[] f = new int[a.Length];
int[] g = new int[a.Length];
int[] h = new int[a.Length];
int[] i = new int[a.Length];
int[] j = new int[a.Length];
int[] k = new int[a.Length];
int[] l = new int[a.Length];
Array.Copy(a, b, a.Length);
Array.Copy(a, c, a.Length);
Array.Copy(a, e, a.Length);
Array.Copy(a, f, a.Length);
Array.Copy(a, h, a.Length);
Array.Copy(a, i, a.Length);
Array.Copy(a, j, a.Length);
Array.Copy(a, k, a.Length);
Array.Copy(a, l, a.Length);
// SortTestHelper.testSort("Selection Sort", SelectionSort.sort, a);
// SortTestHelper.testSort("Insertion Sort Basic", InsertionSort.sortBasic, b);
SortTestHelper.testSort("Insertion Sort Advanced", InsertionSort.sortAdvanced, c);
SortTestHelper.testSort("Insertion Sort Advanced Nearly Ordered", InsertionSort.sortAdvanced, d);
// SortTestHelper.testSort("Bubble Sort", BubbleSort.sort, e);
//SortTestHelper.testSort("Shell Sort", ShellSort.sort, f);
SortTestHelper.testSort("Merge Sort", MergeSort <int> .sort, g);
SortTestHelper.testSort("Merge Sort Advanced", MergeSortAdvanced <int> .sort, h);
SortTestHelper.testSort("Merge Sort Buttom UP", MergeSortBU <int> .sort, i);
SortTestHelper.testSort("Quick Sort", QuickSort.sort, j);
SortTestHelper.testSort("Heap Sort", HeapSort.sort, k);
SortTestHelper.testSort("Heap Sort - no aux array", HeapSort2.sort, l);
//foreach (int o in l)
//{
// Console.WriteLine(o);
//}
Console.WriteLine("------------------------");
float[] z = { 3.1F, 2.2F, 3.2F, 1.1F };
InsertionSort.sortBasic(z);
foreach (float y in z)
{
Console.WriteLine(y);
}
Student[] stu = { new Student("A", 10), new Student("C", 30), new Student("B", 20), new Student("D", 20) };
SelectionSort.sort <Student>(stu);
foreach (Student y in stu)
{
Console.WriteLine(y);
}
}