(3)用java实现 [backcolor=rgb(27, 36, 38) !important][size=1em][backcolor=rgb(67, 90, 95) !important][size=1em]?
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| [size=1em][size=1em]import java.util.Arrays;
[size=1em]public class HeapSort {
[size=1em] int a[]={49,38,65,97,76,13,27,49,78,34,12,64,5,4,62,99,98,54,56,17,18,23,34,15,35,25,53,51};
[size=1em] public HeapSort(){
[size=1em] heapSort(a);
[size=1em] }
[size=1em] public void heapSort(int[] a){
[size=1em] System.out.println("开始排序");
[size=1em] int arrayLength=a.length;
[size=1em] //循环建堆
[size=1em] for(int i=0;i<arrayLength-1;i++){
[size=1em] //建堆
[size=1em] buildMaxHeap(a,arrayLength-1-i);
[size=1em] //交换堆顶和最后一个元素
[size=1em] swap(a,0,arrayLength-1-i);
[size=1em] System.out.println(Arrays.toString(a));
[size=1em] }
[size=1em] }
[size=1em] private void swap(int[] data, int i, int j) {
[size=1em] // TODO Auto-generated method stub
[size=1em] int tmp=data;
[size=1em] data=data[j];
[size=1em] data[j]=tmp;
[size=1em] }
[size=1em] //对data数组从0到lastIndex建大顶堆
[size=1em] private void buildMaxHeap(int[] data, int lastIndex) {
[size=1em] // TODO Auto-generated method stub
[size=1em] //从lastIndex处节点(最后一个节点)的父节点开始
[size=1em] for(int i=(lastIndex-1)/2;i>=0;i--){
[size=1em] //k保存正在判断的节点
[size=1em] int k=i;
[size=1em] //如果当前k节点的子节点存在
[size=1em] while(k*2+1<=lastIndex){
[size=1em] //k节点的左子节点的索引
[size=1em] int biggerIndex=2*k+1;
[size=1em] //如果biggerIndex小于lastIndex,即biggerIndex+1代表的k节点的右子节点存在
[size=1em] if(biggerIndex<lastIndex){
[size=1em] //若果右子节点的值较大
[size=1em] if(data[biggerIndex]<data[biggerIndex+1]){
[size=1em] //biggerIndex总是记录较大子节点的索引
[size=1em] biggerIndex++;
[size=1em] }
[size=1em] }
[size=1em] //如果k节点的值小于其较大的子节点的值
[size=1em] if(data[k]<data[biggerIndex]){
[size=1em] //交换他们
[size=1em] swap(data,k,biggerIndex);
[size=1em] //将biggerIndex赋予k,开始while循环的下一次循环,重新保证k节点的值大于其左右子节点的值
[size=1em] k=biggerIndex;
[size=1em] }else{
[size=1em] break;
[size=1em] }
[size=1em] }<p align="left"> <span> </span>}</p>
[size=1em]<p align="left"> }</p>
[size=1em]<p align="left"> <span style="background-color:white;">}</span></p>
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5.冒泡排序 (1)基本思想:在要排序的一组数中,对当前还未排好序的范围内的全部数,自上而下对相邻的两个数依次进行比较和调整,让较大的数往下沉,较小的往上冒。即:每当两相邻的数比较后发现它们的排序与排序要求相反时,就将它们互换。 (2)实例:
(3)用java实现 [backcolor=rgb(27, 36, 38) !important][size=1em][backcolor=rgb(67, 90, 95) !important][size=1em]?
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| [size=1em][size=1em]public class bubbleSort {
[size=1em]public bubbleSort(){
[size=1em] int a[]={49,38,65,97,76,13,27,49,78,34,12,64,5,4,62,99,98,54,56,17,18,23,34,15,35,25,53,51};
[size=1em] int temp=0;
[size=1em] for(int i=0;i<a.length-1;i++){
[size=1em] for(int j=0;j<a.length-1-i;j++){
[size=1em] if(a[j]>a[j+1]){
[size=1em] temp=a[j];
[size=1em] a[j]=a[j+1];
[size=1em] a[j+1]=temp;
[size=1em] }
[size=1em] }
[size=1em] }
[size=1em] for(int i=0;i<a.length;i++)
[size=1em] System.out.println(a);
[size=1em]}
[size=1em]}
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6.快速排序
(1)基本思想:选择一个基准元素,通常选择第一个元素或者最后一个元素,通过一趟扫描,将待排序列分成两部分,一部分比基准元素小,一部分大于等于基准元素,此时基准元素在其排好序后的正确位置,然后再用同样的方法递归地排序划分的两部分。 (2)实例:
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