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                # C 中的快速排序程序 > 原文: [https://beginnersbook.com/2015/02/quicksort-program-in-c/](https://beginnersbook.com/2015/02/quicksort-program-in-c/) 快速排序是一種分而治之的算法。步驟如下:1)從數組中選取一個元素,該元素稱為支點元素。 2)將未排序的元素數組劃分為兩個數組,第一個子數組中是小于支點的值,而值大于支點的所有元素都在第二個子數組中(相等的值可以是任意一種)。此步驟稱為分區操作。 3)對具有較小值的元素的子數組有序,和具有較大值的元素的子數組重復,遞歸地重復步驟 2,直到有序。我們在以下 C 程序中實現了相同的邏輯。 #### C 程序 - 快速排序算法實現 ```c #include<stdio.h> void quicksort(int number[25],int first,int last){ int i, j, pivot, temp; if(first<last){ pivot=first; i=first; j=last; while(i<j){ while(number[i]<=number[pivot]&&i<last) i++; while(number[j]>number[pivot]) j--; if(i<j){ temp=number[i]; number[i]=number[j]; number[j]=temp; } } temp=number[pivot]; number[pivot]=number[j]; number[j]=temp; quicksort(number,first,j-1); quicksort(number,j+1,last); } } int main(){ int i, count, number[25]; printf("How many elements are u going to enter?: "); scanf("%d",&count); printf("Enter %d elements: ", count); for(i=0;i<count;i++) scanf("%d",&number[i]); quicksort(number,0,count-1); printf("Order of Sorted elements: "); for(i=0;i<count;i++) printf(" %d",number[i]); return 0; } ``` **輸出:** ![quick_sort_output_cmd](https://img.kancloud.cn/5f/33/5f334f777acad11793c84ce41192c958_541x236.jpg)
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