计数排序

// count_sort.cpp : 定义控制台应用程序的入口点。
//

#include "stdafx.h"
#include<iostream>
using namespace std;

void count_sort(int *a,int *b,int *c,int n,int k);
int _tmain(int argc, _TCHAR* argv[])
{
int a[8]={2,5,3,0,2,3,0,3};
int k=8;
int *b=new int[8];//存储排好序后的数组
int *c=new int[6];//计数数组，长度为数组中最大+1
cout<<"排序前：";
for (int i = 0; i < 8; i++)
{
cout<<a[i]<<" ";
}
cout<<endl;
count_sort(a,b,c,8,k);
cout<<"排序后：";
for (int i = 0; i < 8; i++)
{
cout<<b[i]<<" ";
}
cout<<endl;
return 0;
}
void count_sort(int *a,int *b,int *c,int n,int k)//k为数组中出现的最大元素，n为数组的长度
{
for (int i = 0; i <= k; i++)
{
c[i]=0;
}
for (int i = 0; i < n; i++)
{
b[i]=0;
}
for (int i = 0; i < n; i++)
{
c[a[i]]++;
}
for (int i = 1; i <= k; i++)
{
c[i]=c[i]+c[i-1];
}
for (int i = n-1; i >= 0; i--)
{
b[c[a[i]]]=a[i];
c[a[i]]--;
}
}