这个问题已经在这里有了答案:
11年前关闭。
.NET中是否有类似堆的类?
我需要某种可以从中检索分钟的集合。元素。我只想要3种方法:
Add()
RemoveMinElement()
GetMinElement()
我不能使用排序列表,因为键必须是唯一的,并且我可能有几个相同的元素。
最佳答案
您可以使用带有自定义键的 SortedList
或 SortedDictionary
(请参见下面的讨论)。如果您使用的是具有引用相等性的类型,但是可以根据您关心的值进行比较,那么这可以工作。
像这样:
class HeapKey : IComparable<HeapKey>
{
public HeapKey(Guid id, Int32 value)
{
Id = id;
Value = value;
}
public Guid Id { get; private set; }
public Int32 Value { get; private set; }
public int CompareTo(HeapKey other)
{
if (_enableCompareCount)
{
++_compareCount;
}
if (other == null)
{
throw new ArgumentNullException("other");
}
var result = Value.CompareTo(other.Value);
return result == 0 ? Id.CompareTo(other.Id) : result;
}
}
这是使用具有二进制堆性能特征的SortedDictionary
的工作示例:using System;
using System.Collections.Generic;
using System.Linq;
namespace SortedDictionaryAsBinaryHeap
{
class Program
{
private static Boolean _enableCompareCount = false;
private static Int32 _compareCount = 0;
static void Main(string[] args)
{
var rnd = new Random();
for (int elementCount = 2; elementCount <= 6; elementCount++)
{
var keyValues = Enumerable.Range(0, (Int32)Math.Pow(10, elementCount))
.Select(i => new HeapKey(Guid.NewGuid(), rnd.Next(0, 10)))
.ToDictionary(k => k);
var heap = new SortedDictionary<HeapKey, HeapKey>(keyValues);
_compareCount = 0;
_enableCompareCount = true;
var min = heap.First().Key;
_enableCompareCount = false;
Console.WriteLine("Element count: {0}; Compare count for getMinElement: {1}",
(Int32)Math.Pow(10, elementCount),
_compareCount);
_compareCount = 0;
_enableCompareCount = true;
heap.Remove(min);
_enableCompareCount = false;
Console.WriteLine("Element count: {0}; Compare count for deleteMinElement: {1}",
(Int32)Math.Pow(10, elementCount),
_compareCount);
}
Console.ReadKey();
}
private class HeapKey : IComparable<HeapKey>
{
public HeapKey(Guid id, Int32 value)
{
Id = id;
Value = value;
}
public Guid Id { get; private set; }
public Int32 Value { get; private set; }
public int CompareTo(HeapKey other)
{
if (_enableCompareCount)
{
++_compareCount;
}
if (other == null)
{
throw new ArgumentNullException("other");
}
var result = Value.CompareTo(other.Value);
return result == 0 ? Id.CompareTo(other.Id) : result;
}
}
}
}
结果:关于c# - .NET中的堆类,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/2231796/