[英]Insertion sort dynamic array
我正在嘗試編譯以下代碼:(通常是 get 和 set 操作)請協助檢查插入排序功能,其余所有編譯完美。 僅比較 2 個單元格的返回值(它是正確的)。
知道是什么原因造成的嗎?
private static void Main()
{
IArray<int?> arr = Read();
Console.WriteLine(arr);
SelectionSort(arr);
Console.WriteLine(arr);
if (arr.Length >= 2)
{
arr.Set(arr.Length - 2, null);
Console.WriteLine(arr);
}
if (arr.Length >= 1)
{
arr.Set(arr.Length - 1, null);
Console.WriteLine(arr);
}
SelectionSort(arr);
Console.WriteLine(arr);
Console.WriteLine("(" + arr.Get(100) + ")");
Console.WriteLine("insertion sort");
int n = arr.Length;
Insertionsort(arr, n);
Console.WriteLine(arr);
//// throw exception
//_ = new DynArr<int>();
}
private static IArray<int?> Read()
{
var arr = new DynArr<int?>();
Console.Write("Enter size >> ");
var size = int.Parse(Console.ReadLine().Trim());
for (var i = 0; i < size; ++i)
{
Console.Write("Enter [" + i + "] >> ");
arr.Set(i, int.Parse(Console.ReadLine().Trim()));
}
return arr;
}
}
private static void Insertionsort(IArray<int?> arr, int n)
{
for (int i = 1; i < n; i++)
{
var j = i - 1;
voidcompare(arr, i, j);
}
}
private static void voidcompare(IArray<int?> arr, int i, int j)
{
var c = arr.Get(i);
while (j >= 0 && arr.Get(j) > c)
{
arr.Set(j + 1, c);
}
}
}
}
你的排序算法。 不正確。 看看它是如何工作的 - 插入排序。 下面我為您提供一個可能的實現。
public class Program
{
static void Main()
{
var collection = new List<int?> { 25, 71, 43, -1, 15, 0, 38 };
DoInsertionSort(collection, collection.Count);
Console.WriteLine(string.Join(Environment.NewLine, collection));
}
static void DoInsertionSort(IList<int?> collection, int length)
{
if (collection is null || collection.Count == 0 || length <= 0 || length > collection.Count)
{
return;
}
var previous = default(int?);
for (int index = 0; index < length; index++)
{
var current = collection.Get(index);
if (current < previous)
{
SwapUpToStart(collection, current, index);
}
previous = collection.Get(index);
}
}
private static void SwapUpToStart(IList<int?> collection, int? current, int currentIndex)
{
for (int index = currentIndex - 1; index >= 0; index--)
{
var previous = collection.Get(index);
if (current >= previous)
{
break;
}
collection.Swap(index, current, previous);
}
}
}
public static class YourIArray_T_Implementation
{
public static int? Get(this IList<int?> collection, int index)
{
return collection[index];
}
public static void Swap(this IList<int?> collection, int index, int? current, int? previous)
{
collection[index] = current;
collection[index + 1] = previous;
}
}
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