写几个排序算法暖暖手,供参考。
堆排序:
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public class HeapSortSample
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{
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public enum Relation
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{
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Parent,
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Left,
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Right
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}
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public long GetRelation(long i, Relation r)
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{
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if (i < 0)
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{
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throw new ArgumentOutOfRangeException();
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}
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long index = 0;
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switch (r)
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{
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case Relation.Parent:
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index = (i + 1) / 2 - 1; //父节点
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break;
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case Relation.Left:
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index = 2 * (i + 1) - 1; //左子节点
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break;
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case Relation.Right:
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index = 2 * (i + 1); //右子节点
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break;
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default:
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break;
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}
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return index;
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}
34![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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//假设index的左右都是最大堆,加入index并形成一个新的最大堆
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public void MaxHeap(int[] values, long index, long heapSize)
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{
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if (index >= heapSize)
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{
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throw new ArgumentOutOfRangeException();
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}
42![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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long left = GetRelation(index, Relation.Left);
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long right = GetRelation(index, Relation.Right);
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long max = index;
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if (left < heapSize && values[index] < values[left])
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{
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max = left;
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}
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if (right < heapSize && values[max] < values[right])
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{
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max = right;
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}
54![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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if (max != index)
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{
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CommonFunctions<int> functions = new CommonFunctions<int>();
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functions.ExchangValues(ref values[max], ref values[index]); //交换两个元素
59![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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MaxHeap(values, max, heapSize);
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}
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}
63![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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//创建一个最大堆
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public void BuildMaxHeap(int[] values)
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{
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long begin = values.Length / 2 - 1;
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for (long i = begin; i >= 0; i--)
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{
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MaxHeap(values, i, values.Length);
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}
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}
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/// <summary>
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/// 对堆进行排序,执行完毕后heap变为升序的一个数组
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/// </summary>
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/// <param name="heap">最大堆</param>
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public void Sort(int[] heap)
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{
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CommonFunctions<int> f = new CommonFunctions<int>();
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long length = heap.Length;
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while (length > 1)
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{
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f.ExchangValues(ref heap[0], ref heap[length - 1]);
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length--;
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MaxHeap(heap, 0, length);
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}
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}
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static void Main()
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{
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int[] values = { 2, 5, 4, 9, 1, 7, 3, 8, 6, 0 };
93![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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HeapSortSample sort = new HeapSortSample();
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sort.BuildMaxHeap(values);
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sort.Sort(values);
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foreach (int v in values)
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{
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Console.Write(v + " ");
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}
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}
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}
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