排序类
今天心血来潮,写了个排序的类,本来打算包含6种排序算法的,时间有限,只包含了快排和堆排,以后有时间再补充.这个类将具体的排序算法很好的隐藏起来了,用一个函数指针数组调用相应的排序功能,暴露的接口只有push(),pop(),length(),print(),以及选择排序的函数selectway()
类声明头文件
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类实现cpp文件
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/* sort.h
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by woodfish
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*/
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#include "sort.h"
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using namespace std;
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List::List() {
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n=1;
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memset(a,0,sizeof(a));
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ptr[0]=&List::quicksort;
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ptr[1]=&List::heapsort;
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//ptr[2]=&List::selectsort;
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//ptr[3]=&List::insertsort;
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//ptr[4]=&List::maopaosort;
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//ptr[5]=&List::mergersort;
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}
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void List::push(int nn){
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a[n++]=nn;
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}
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int List::length() const{
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return n-1;
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}
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int List::pop(){
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if(n==1) return 0;
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return a[--n];
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}
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void List::quick(int l,int r){
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if(l<r) {
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int i,j;
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i=l;j=r;
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int temp=a[i];
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while(i<j) {
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while(i<j&&j>=l&&a[j]>=temp) j--;
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if(i<j) a[i++]=a[j];
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while(i<j&&i<=r&&a[i]<=temp) i++;
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if(i<j) a[j--]=a[i];
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}
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a[i]=temp;
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quick(l,i-1);
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quick(i+1,r);
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}
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}
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void List::quicksort(){
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quick(1,n-1);
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}
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void List::selectway(int nn) const{
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(this->*ptr[nn])();
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}
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void List::print() const{
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for(int i=1;i<n;i++)
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cout<<a[i]<<" ";
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cout<<endl;
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}
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void List::shiftdown(int downn,int maxn){
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int j,rc;
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rc=a[downn];
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for(j=2*downn;j<=maxn;j+=2){
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if(j<maxn&&a[j]<a[j+1]) ++j;
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if(rc>=a[j]) break;
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a[downn]=a[j];
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downn=j;
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}
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a[downn]=rc;
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}
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void List::heapsort(){
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makeheap();
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for(int i=n-1;i>=1;i--) {
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int temp=a[1];
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a[1]=a[i];
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a[i]=temp;
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shiftdown(1,i-1);
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}
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}
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void List::makeheap(){
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for(int i=(n-1)/2;i>=1;i--)
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shiftdown(i,n-1);
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}
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测试该排序类
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