快速排序是一种高效的排序算法,使用分治法策略。它的基本思想是:选择一个元素作为“基准”(pivot),重新排序数列,所有比基准值小的元素摆放在基准前面,所有比基准值大的摆在基准的后面。在这个分区退出之后,该基准就处于数列的中间位置。这个过程称为分区(partition)操作。然后,递归地(recursive)把小于基准值元素的子数列和大于基准值元素的子数列排序。
public class QuickSort {
public static void quickSort(int[] arr, int low, int high) {
if (low < high) {
int pivotIndex = partition(arr, low, high);
quickSort(arr, low, pivotIndex - 1); // 对基准左边的数组进行递归排序
quickSort(arr, pivotIndex + 1, high); // 对基准右边的数组进行递归排序
}
}
private static int partition(int[] arr, int low, int high) {
int pivot = arr[high];
int i = (low - 1); // 小于基准的元素的索引
for (int j = low; j < high; j++) {
if (arr[j] < pivot) {
i++;
swap(arr, i, j);
}
}
swap(arr, i + 1, high);
return i + 1;
}
private static void swap(int[] arr, int i, int j) {
int temp = arr[i];
arr[i] = arr[j];
arr[j] = temp;
}
public static void main(String args[]) {
int[] arr = {10, 7, 8, 9, 1, 5};
int n = arr.length;
quickSort(arr, 0, n - 1);
System.out.println("Sorted array: ");
for (int i : arr) {
System.out.print(i + " ");
}
}
}
fun quickSort(arr: IntArray, low: Int, high: Int) {
if (low < high) {
val pi = partition(arr, low, high)
quickSort(arr, low, pi - 1)
quickSort(arr, pi + 1, high)
}
}
fun partition(arr: IntArray, low: Int, high: Int): Int {
val pivot = arr[high]
var i = low - 1
for (j in low until high) {
if (arr[j] < pivot) {
i++
arr[i] = arr[j].also { arr[j] = arr[i] }
}
}
arr[i + 1] = arr[high].also { arr[high] = arr[i + 1] }
return i + 1
}
fun main() {
val arr = intArrayOf(10, 7, 8, 9, 1, 5)
val n = arr.size
quickSort(arr, 0, n - 1)
println("Sorted array: ${arr.joinToString(" ")}")
}
#include
void quickSort(int arr[], int low, int high) {
if (low < high) {
int pi = partition(arr, low, high);
quickSort(arr, low, pi - 1);
quickSort(arr, pi + 1, high);
}
}
int partition(int arr[], int low, int high) {
int pivot = arr[high];
int i = low - 1;
for (int j = low; j < high; j++) {
if (arr[j] < pivot) {
i++;
int temp = arr[i];
arr[i] = arr[j];
arr[j] = temp;
}
}
int temp = arr[i + 1];
arr[i + 1] = arr[high];
arr[high] = temp;
return i + 1;
}
int main() {
int arr[] = {10, 7, 8, 9, 1, 5};
int n = sizeof(arr) / sizeof(arr[0]);
quickSort(arr, 0, n - 1);
printf("Sorted array: ");
for (int i = 0; i < n; i++) {
printf("%d ", arr[i]);
}
printf("\n");
return 0;
}
#include
void quickSort(int arr[], int low, int high) {
if (low < high) {
int pi = partition(arr, low, high);
quickSort(arr, low, pi - 1);
quickSort(arr, pi + 1, high);
}
}
int partition(int arr[], int low, int high) {
int pivot = arr[high];
int i = low - 1;
for (int j = low; j < high; j++) {
if (arr[j] < pivot) {
i++;
std::swap(arr[i], arr[j]);
}
}
std::swap(arr[i + 1], arr[high]);
return i + 1;
}
int main() {
int arr[] = {10, 7, 8, 9, 1, 5};
int n = sizeof(arr) / sizeof(arr[0]);
quickSort(arr, 0, n - 1);
std::cout << "Sorted array: ";
for (int i = 0; i < n; i++) {
std::cout << arr[i] << " ";
}
std::cout << std::endl;
return 0;
}
void quickSort(List<int> arr, int low, int high) {
if (low < high) {
int pivotIndex = partition(arr, low, high);
quickSort(arr, low, pivotIndex - 1);
quickSort(arr, pivotIndex + 1, high);
}
}
int partition(List<int> arr, int low, int high) {
int pivot = arr[high];
int i = low - 1;
for (int j = low; j < high; j++) {
if (arr[j] < pivot) {
i++;
swap(arr, i, j);
}
}
swap(arr, i + 1, high);
return i + 1;
}
void swap(List<int> arr, int i, int j) {
int temp = arr[i];
arr[i] = arr[j];
arr[j] = temp;
}
void main() {
List<int> arr = [10, 7, 8, 9, 1, 5];
quickSort(arr, 0, arr.length - 1);
print("Sorted array: $arr");
}
function quickSort(arr, low, high) {
if (low < high) {
let pi = partition(arr, low, high);
quickSort(arr, low, pi - 1);
quickSort(arr, pi + 1, high);
}
}
function partition(arr, low, high) {
let pivot = arr[high];
let i = low - 1;
for (let j = low; j < high; j++) {
if (arr[j] < pivot) {
i++;
swap(arr, i, j);
}
}
swap(arr, i + 1, high);
return i + 1;
}
function swap(arr, i, j) {
let temp = arr[i];
arr[i] = arr[j];
arr[j] = temp;
}
// 使用示例
let arr = [10, 7, 8, 9, 1, 5];
quickSort(arr, 0, arr.length - 1);
console.log("Sorted array:", arr);
以下是一个基本的 ARM 汇编语言快速排序算法示例,适用于运行 ARM 架构处理器的 Linux 系统。请注意,这个例子是针对 ARMv7 架构编写的,可能需要根据你的具体 ARM 架构版本做出调整。
.global quicksort
.data
array: .word 10, -1, 8, 3, 2, -5, 4
length: .word 7
.text
quicksort:
push {r4-r11, lr}
mov r1, #0
ldr r2, =length
ldr r2, [r2]
subs r2, r2, #1
bl partition
pop {r4-r11, pc}
partition:
push {r4-r11, lr}
mov r11, r1
mov r10, r0
ldr r4, [r0, r2, lsl #2]
partition_loop:
ldr r3, [r10, r11, lsl #2]
cmp r3, r4
addge r11, r11, #1
blt swap
cmp r11, r2
blt partition_loop
bl swap
pop {r4-r11, pc}
swap:
push {r4-r11, lr}
ldr r3, [r10, r1, lsl #2]
ldr r12, [r10, r11, lsl #2]
str r12, [r10, r1, lsl #2]
str r3, [r10, r11, lsl #2]
pop {r4-r11, pc}
在这个示例中,quicksort
函数是快速排序算法的入口点,partition
是用于分区的函数,而 swap
函数用于交换数组中的两个元素。这些函数使用 ARM 寄存器和指令来处理数组中的元素,并执行排序算法的步骤。
要运行这个程序,你需要在支持 ARM 架构的 Linux 系统上使用适当的汇编器和链接器。在不同的 ARM 架构版本(如 ARMv6、ARMv8)上,可能需要进行语法或指令集的调整。
请注意,这只是一个基本的示例,可能需要进一步的优化和调整以适应特定的需求和环境。