排序堆排序

堆排序

堆排序(Heapsort)是指利用堆积树（堆）这种数据结构所设计的一种排序算法，它是选择排序的一种。可以利用数组的特点快速定位指定索引的元素。堆分为大根堆和小根堆，是完全二叉树。大根堆的要求是每个节点的值都不大于其父节点的值，即A...

堆排序

堆排序堆排序(Heapsort)是指利用堆积树（堆）这种数据结构所设计的一种排序算法，它是选择排序的一种。它是通过堆来进行选择数据。需要注意的是排升序要建大堆，排降序建小堆。void Swap(int*e1,int*e2){ int tem=*e1;e1=*e2;e2=tem;} void...

堆排序

堆排序实例首先，建立初始的堆结构如图：然后，交换堆顶的元素和最后一个元素，此时最后一个位置作为有序区（有序区显示为黄色），然后进行其他无序区的堆调整，重新得到大顶堆后，交换堆顶和倒数第二个元素的位置…… 重复此过程：最后，...

堆排序

概念：堆排序（Heapsort）是指利用堆这种数据结构所设计的一种排序算法。堆积是一个近似完全二叉树的结构，并同时满足堆积的性质：即子结点的键值或索引总是小于（或者大于）它的父节点。算法描述:将初始待排序关键字序列(R1,R2….Rn)构建...

堆排序

2.堆排序的思想利用大顶堆(小顶堆)堆顶记录的是最大关键字(最小关键字)这一特性，使得每次从无序中选择最大记录(最小记录)变得简单。其基本思想为(大顶堆)：1)将初始待排序关键字序列(R1,R2.Rn)构建成大顶堆，此堆为初始的无序区；2)将堆...

堆排序

堆排序 堆排序是利用堆的性质进行的一种选择排序。下面先讨论一下堆。1.堆堆实际上是一棵完全二叉树，其任何一非叶节点满足性质：Key[i][2i+1]&Key[i][2i+2]或者Key[i]>=Key[2i+1]&key>=key[2i+2]即任何一非叶节点的关键字不大于或者不...

堆排序

堆排序的特点是：在排序过程中，将R[l.n]看成是一棵完全二叉树的顺序存储结构，利用完全二叉树中双亲结点和孩子结点之间的内在关系(参见二叉树的顺序存储结构)，在当前无序区中选择关键字最大(或最小)的记录。直接选择排序中，为了从R[1.n]...

堆排序

堆排序（Heap Sort）只需要一个记录元素大小的辅助空间（供交换用），每个待排序的记录仅占有一个存储空间。堆的存储一般用数组来表示堆，若根结点存在序号0处，i结点的父结点下标就为(i-1)/2。i结点的左右子结点下标分别为2*i+1和2*i+2。...

堆排序

堆排序 堆排序利用了大根堆（或小根堆）堆顶记录的关键字最大（或最小）这一特征，使得在当前无序区中选取最大（或最小）关键字的记录变得简单。（1）用大根堆排序的基本思想 ① 先将初始文件R[1.n]建成一个大根堆，此堆为初始的无序区 ② ...

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智能开放搜索OpenSearch

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