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【Sort】多种排序

这篇文章包含了插入排序，希尔排序，堆排序，归并排序和快速排序，是前几篇文章的集合。

一共包括三个文件

sort.h

sort.cpp

main.cpp

1.main.cpp

1 #include <iostream>
2 #include "sort.h"
3 using namespace std;
4 
5 int main()
6 {
7 \test code
8     return 0;
9 }

2.sort.h

 1 #ifndef SORT_H_
 2 #define SORT_H_
 3 void intersort(int *nums,int n);
 4 void shellsort(int *nums,int n);
 5 void percdown(int *num,int p,int n);
 6 void heapsort(int *nums,int n);
 7 void mergesort(int *nums,int n);
 8 void msort(int *nums,int*tmp,int lp,int rp);
 9 void merge(int *nums,int *tmp,int lp,int rp,int over);
10 void swap(int &m,int &n);
11 int mid3(int *nums,int left,int right);
12 void qs(int*nums,int left,int right);
13 void quicksort(int *nums,int n);
14 #endif // SORT_H_

3.sort.cpp

  1 #include "sort.h"
  2 #include<iostream>
  3 
  4 void intersort(int *nums,int n)
  5 {
  6     int i,j;
  7     int tmp;
  8     for(i=1;i<n;i++)
  9     {
 10         tmp=nums[i];
 11         for(j=i;j>0&&tmp<nums[j-1];j--)
 12             nums[j]=nums[j-1];
 13         nums[j]=tmp;
 14     }
 15 }
 16 
 17 void shellsort(int *nums,int n)
 18 {
 19     int gap,i,j;
 20     int tmp;
 21     for(gap=n/2;gap>0;gap/=2)
 22     {
 23         for(i=gap;i<n;i++)
 24         {
 25             tmp=nums[i];
 26             for(j=i;j>0;j-=gap)
 27                 if(tmp<nums[j-gap])
 28                     nums[j]=nums[j-gap];
 29                 else
 30                     break;
 31             nums[j]=tmp;
 32         }
 33     }
 34 }
 35 
 36 void heapsort(int *nums,int n)
 37 {
 38     int i;
 39     for(i=n/2;i>=0;i--)
 40         percdown(nums,i,n);
 41     for(i=n-1;i>0;i--)
 42     {
 43         nums[0]^=nums[i];
 44         nums[i]^=nums[0];
 45         nums[0]^=nums[i];
 46         percdown(nums,0,i);
 47     }
 48 }
 49 void percdown(int *nums,int p,int n)
 50 {
 51     int tmp;
 52     int child;
 53     for(tmp=nums[p];2*p+1<n;p=child)
 54     {
 55         child=2*p+1;
 56         if(2*p+2!=n&&nums[2*p+2]>nums[child])
 57             child++;
 58         if(nums[child]>tmp)
 59             nums[p]=nums[child];
 60             else
 61                 break;
 62     }
 63     nums[p]=tmp;
 64 
 65 }
 66 
 67 void mergesort(int *nums,int n)
 68 {
 69     int *tmp=new int[n];
 70     if(tmp)
 71     {
 72         msort(nums,tmp,0,n-1);
 73         delete[]tmp;
 74     }
 75 }
 76 void msort(int *nums,int*tmp,int lp,int rp)
 77 {
 78     int center=(lp+rp)/2;
 79     if(lp<rp)
 80     {
 81         msort(nums,tmp,lp,center);
 82         msort(nums,tmp,center+1,rp);
 83         merge(nums,tmp,lp,center+1,rp);
 84     }
 85 }
 86 void merge(int *nums,int *tmp,int lp,int rp,int over)
 87 {
 88     int i=lp,j=rp,p=lp;
 89     while(i<rp&&j<=over)
 90     {
 91         if(nums[i]<nums[j])
 92             tmp[p++]=nums[i++];
 93         else
 94             tmp[p++]=nums[j++];
 95     }
 96     while(i<=rp-1)
 97         tmp[p++]=nums[i++];
 98     while(j<=over)
 99         tmp[p++]=nums[j++];
100     while(lp<=over)
101     {
102         nums[lp]=tmp[lp];
103         lp++;
104     }
105 }
106 
107 
108 void quicksort(int *nums,int n)
109 {
110     qs(nums,0,n-1);
111 }
112 void qs(int*nums,int left,int right)
113 {
114     int pv;
115     int i,j;
116     int cutoff=10;
117     if(left+cutoff<=right)
118     {
119         pv=mid3(nums,left,right);
120         i=left;
121         j=right-1;
122         while(1)
123         {
124             while(nums[++i]<pv);
125             while(nums[--j]>pv);
126             if(i<j)
127                 swap(nums[i],nums[j]);
128             else
129                 break;
130         }
131         swap(nums[i],nums[right-1]);
132         qs(nums,left,i);
133         qs(nums,i+1,right);
134     }
135     else
136         intersort(nums+left,right-left+1);
137 }
138 int mid3(int *nums,int left,int right)
139 {
140     int center=(left+right)/2;
141     if(nums[left]>nums[center])
142         swap(nums[left],nums[center]);
143     if(nums[left]>nums[right])
144         swap(nums[left],nums[right]);
145     if(nums[center]>nums[right])
146         swap(nums[center],nums[right]);
147     swap(nums[center],nums[right-1]);
148     return nums[right-1];
149 }
150 void swap(int &m,int &n)
151 {
152     m^=n;
153     n^=m;
154     m^=n;
155 }

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原文地址：https://www.cnblogs.com/fcyworld/p/6175623.html