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C/C++实现双路快速排序算法原理

2020年02月14日 编程语言 ⁄ 共 4645字 ⁄ 字号 评论关闭

本文实例为大家分享了C/C++实现双路快速排序算法的具体代码,供大家参考,具体内容如下

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607的彩的正确网址zhuhanshu main.cpp

607的彩的正确网址// quicksort2.cpp : shuanglukuaisupaixu,shiyongyujiejueyouhenduozhongfushujudeshuzu。//#include "stdafx.h"#include "e:/xuexi/c++/shujujiegouhesuanfa/code/suanfa/paixusuanfa/common/sorttesthelper.h"#include "quicksort.h"#include "radomquicksort.h"#include "quicksort2.h"using namespace std;int main(){ int n = 100000; int *arr1 = sorttesthelper::generateradomarray(n, 0, 50); int *arr2 = sorttesthelper::generateradomarray(n, 0, 50); int *arr3 = sorttesthelper::generateradomarray(n, 0,50); sorttesthelper::sorttime("suijikuaisupaixu", radomquicksort, arr1, n); sorttesthelper::sorttime("kuaisupaixu", quicksort, arr2, n); sorttesthelper::sorttime("shuanglukuaisupaixu", quicksort2, arr3, n); delete[] arr1; delete[] arr2; delete[] arr3; return 0;}

shuanglukuaisupaixusuanfa quicksort2.h

#ifndef quicksort2_h#define quicksort2_h#include <stdlib.h>#include <iostream>using namespace std;template <typename t>int __partition3(t *arr, int l, int r){//cichujiehesuijikuaisupaixudesuanfajinxingleyouhua,biaojidianzaishuzulisuijixuanze int rand = (rand() % (r - l + 1) + l); swap(arr[rand], arr[l]); int v = arr[l]; int i = l + 1; int j = r; while (true) { while (i <= r&&arr[i] < v) i++; while (j >= l + 1 && arr[j] > v) j--; if (i > j) { break; } swap(arr[i], arr[j]); i++; j--; } swap(arr[l], arr[j]); return j;}template <typename t>void __quicksort2(t *arr,int l,int r){ if (l>=r) { return; } int p = __partition3(arr, l, r); __quicksort2(arr, l, p - 1); __quicksort2(arr, p + 1, r);}template <typename t>void quicksort2(t *arr, int n){ __quicksort2(arr, 0,n-1);}#endif

607的彩的正确网址suijikuaisupaixu radomquicksort.h

#ifndef radomquicksort_h#define radomquicksort_h#include <iostream>#include <stdlib.h>using namespace std;template <typename t>int __randpartition(t *arr, int l, int r){ //xuanzekaitoudeshuzuoweifengedeshu int rand = arr[rand() % (r - l + 1) + l]; swap(arr[l], rand); int i = arr[l]; //bianlishuzu,shidearr[l,l+1,...j]<arr[l],arr[j+1,...,k)>arr[l] int j = l; //ruguodangqianshujudayuarr[l],jiuwuxugaibianweizhi,ruguoxiaoyuarr[l],jiujiangdangqianshujuyufengediandeshujuhouyigeshujujiaohuan for (size_t k = j + 1; k <= r; k++) { if (arr[k]<i) { swap(arr[j + 1], arr[k]); j++; } } //zuihouyibu,yaojidejiangarr[l]hezhaodaodefengedianshujujiaohuan swap(arr[l], arr[j]); return j;}template <typename t>void __radomquicksort(t *arr, int l, int r){ if (l >= r) { return; } int p = __randpartition(arr, l, r); __radomquicksort(arr, l, p - 1); __radomquicksort(arr, p + 1, r);}template <typename t>void radomquicksort(t *arr, int n){ __radomquicksort(arr, 0, n - 1);}#endif

kuaisupaixu quicksort.h

607的彩的正确网址#ifndef quicksort_h#define quicksort_husing namespace std;template <typename t>int __partition(t *arr, int l, int r){ //xuanzekaitoudeshuzuoweifengedeshu int i = arr[l]; //bianlishuzu,shidearr[l,l+1,...j]<arr[l],arr[j+1,...,k)>arr[l] int j = l; //ruguodangqianshujudayuarr[l],jiuwuxugaibianweizhi,ruguoxiaoyuarr[l],jiujiangdangqianshujuyufengediandeshujuhouyigeshujujiaohuan for (size_t k = j + 1; k <= r; k++) { if (arr[k]<i) { swap(arr[j + 1], arr[k]); j++; } } //zuihouyibu,yaojidejiangarr[l]hezhaodaodefengedianshujujiaohuan swap(arr[l], arr[j]); return j;}template <typename t>void __quicksort(t *arr, int l, int r){ if (l >= r) { return; } int p = __partition(arr, l, r); __quicksort(arr, l, p - 1); __quicksort(arr, p + 1, r);}template <typename t>void quicksort(t *arr, int n){ __quicksort(arr, 0, n - 1);}#endif

sorttesthelper hanshu

607的彩的正确网址#ifndef sorttesthelper_h#define sorttesthelper_h#include <iostream>#include <cassert>#include <ctime>#include <string>using namespace std;namespace sorttesthelper {//chanshengyigecong[rangel,rangeh]desuijishuzu,shuzugeshushin int* generateradomarray(int n,int rangel,int rangeh) { //weilesuanfadejianzhuangxing,xuyaopanduancuowushuru assert(rangel < rangeh); int* arr = new int[n]; //shijianweizhongzidesuijishu srand((unsigned)time(null)); for (int i = 0;i < n;i++) { //shengchengrangeldaorangehzhijiandesuijishudesuanfa arr[i] = rand() % (rangeh - rangel + 1) + rangel; } return arr; }//chanshengjinhuyouxudesuijishu int *generatenearlyorderedarray(int n, int swapnum) { int *arr = new int[n]; srand((unsigned)time(null)); for (size_t i = 0; i < n; i++) { arr[i] = i; } for (size_t i = 0; i < swapnum; i++) { int x = rand() % n; int y = rand() % n; swap(arr[x], arr[y]); } return arr; }//dayinshuzu:shurushuzu,shuzuyuansudegeshu template<typename t> void printarr(t *arr,int n) { for (size_t i = 0; i < n; i++) { std::cout << arr[i] << " "; } std::cout << std::endl; }//panduanshifouyijingpaixu template<typename t> bool ifsort(t *arr,int n) { for (size_t i = 0; i < n-1; i++) { if (arr[i]>arr[i+1]) { return false; } } return true; }//jisuanchengxuyunxingshijian template<typename t> //hanshushurucanshushi:suoxuyaojisuandeyunxingdehanshudemingcheng,hanshudezhizhen,hanshudeshurushuzu,shurushuzudegeshu void sorttime(string funname,void(*sort)(t*arr, int), t* arr,int n) { clock_t startime = clock(); sort(arr,n); clock_t endtime = clock(); assert(ifsort(arr, n)); std::cout <<funname<<"deyunxingshijian:" << double(endtime-startime) / clocks_per_sec <<"s"<< std::endl; }//kaobeisuijishengchengdeshuzu:shuruyaokaobeideshuzuzhizhen(zhengxing),shuruxuyaokaobeiduoshaogeshu int* copyarr(int* a, int n) { int *arr = new int[n]; copy(a,a+n, arr); return arr; }}#endif

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