📜  鸡尾酒排序的C ++程序

📅  最后修改于: 2021-05-31 23:41:12             🧑  作者: Mango

鸡尾酒排序是冒泡排序的一种变体。 Bubble排序算法始终从左遍历元素,并在第一次迭代中将最大的元素移至其正确位置,在第二次迭代中将其移至第二大位置,依此类推。鸡尾酒排序在两个方向上交替遍历给定数组。


算法:

算法的每次迭代都分为两个阶段:

  1. 第一级从左到右循环遍历数组,就像冒泡排序一样。在循环期间,将比较相邻的项目,如果左侧的值大于右侧的值,则将交换值。在第一次迭代结束时,最大数量将驻留在数组的末尾。
  2. 第二阶段以相反的方向循环通过数组-从刚排序的项目之前的项目开始,然后移回数组的开头。同样,在这里,比较相邻的项目,并在需要时进行交换。
// C++ implementation of Cocktail Sort
#include 
using namespace std;
  
// Sorts arrar a[0..n-1] using Cocktail sort
void CocktailSort(int a[], int n)
{
    bool swapped = true;
    int start = 0;
    int end = n - 1;
  
    while (swapped) {
        // reset the swapped flag on entering
        // the loop, because it might be true from
        // a previous iteration.
        swapped = false;
  
        // loop from left to right same as
        // the bubble sort
        for (int i = start; i < end; ++i) {
            if (a[i] > a[i + 1]) {
                swap(a[i], a[i + 1]);
                swapped = true;
            }
        }
  
        // if nothing moved, then array is sorted.
        if (!swapped)
            break;
  
        // otherwise, reset the swapped flag so that it
        // can be used in the next stage
        swapped = false;
  
        // move the end point back by one, because
        // item at the end is in its rightful spot
        --end;
  
        // from right to left, doing the
        // same comparison as in the previous stage
        for (int i = end - 1; i >= start; --i) {
            if (a[i] > a[i + 1]) {
                swap(a[i], a[i + 1]);
                swapped = true;
            }
        }
  
        // increase the starting point, because
        // the last stage would have moved the next
        // smallest number to its rightful spot.
        ++start;
    }
}
  
/* Prints the array */
void printArray(int a[], int n)
{
    for (int i = 0; i < n; i++)
        printf("%d ", a[i]);
    printf("\n");
}
  
// Driver code
int main()
{
    int arr[] = { 5, 1, 4, 2, 8, 0, 2 };
    int n = sizeof(arr) / sizeof(arr[0]);
    CocktailSort(arr, n);
    printf("Sorted array :\n");
    printArray(arr, n);
    return 0;
}
输出:
Sorted array :
0 1 2 2 4 5 8

请参阅关于鸡尾酒排序的完整文章,以了解更多详细信息!

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