Quick Sort Algorithm

//============================================================================
// Name : QuickSort.cpp
// Author : Danny
// Version :
// Copyright : Your copyright notice
// Description : Hello World in C++, Ansi-style
//============================================================================

#include <iostream>
using namespace std;

void swap(int a[], int i, int j) {
int temp = a[i];
a[i] = a[j];
a[j] = temp;
}

int position(int a[], int left, int right) {
int pivot = left;
int i = left;
int j = right;
while (i < j) {

while (i < j && a[j] >= a[pivot]) {
j--;
}

if (i < j && a[j] < a[pivot]) {
swap(a, pivot, j);
pivot = j;
}

while (i < j && a[i] <= a[pivot]) {
i++;
}
if (i < j && a[i] > a[pivot]) {
swap(a, pivot, i);
pivot = i;
}

}
return pivot;
}

void quickSort(int a[], int left, int right) {
if (left >= right)
return;
int pos = position(a, left, right);
quickSort(a, left, pos - 1);
quickSort(a, pos + 1, right);

}

int main() {
int a[8] = { 1,2,4,3,3,5,9,0};
quickSort(a, 0, 7);
for (int i = 0; i < 8; i++) {
cout << a[i] << endl;
}
return 0;
}

Java实现代码：

package algorithm;

public class SortAlgorithm {
void quickSort(int a[], int left, int right) {
if (left >= right)
return;
int pos = position(a, left, right);
quickSort(a, left, pos - 1);
quickSort(a, pos + 1, right);

}

void swap(int a[], int i, int j) {
int temp = a[i];
a[i] = a[j];
a[j] = temp;
}

int position(int a[], int left, int right) {
int pivot = left;
int i = left;
int j = right;
while (i < j) {

while (i < j && a[j] >= a[pivot]) {
j--;
}

if (i < j && a[j] < a[pivot]) {
swap(a, pivot, j);
pivot = j;
}

while (i < j && a[i] <= a[pivot]) {
i++;
}
if (i < j && a[i] > a[pivot]) {
swap(a, pivot, i);
pivot = i;
}

}
return pivot;
}

}

主方法类

package algorithm;

public class QuickSort {

public static SortAlgorithm sa;
public static void main(String[] args) {
// TODO Auto-generated method stub
sa=new SortAlgorithm();
int[] a={4,2,1,6,3};
sa.quickSort(a, 0, 4);
for(int i:a){
System.out.println(i);
}
}
}

http://www.cnblogs.com/chen0958/p/4525289.html