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快速排(pai)(pai)序(xu)(xu)實(shi)質上是對(dui)“冒泡排(pai)(pai)序(xu)(xu)”的(de)一種改進(jin)，整(zheng)個排(pai)(pai)序(xu)(xu)過程(cheng)(cheng)可概括為：通過N趟的(de)排(pai)(pai)序(xu)(xu)將(jiang)原(yuan)本的(de)排(pai)(pai)序(xu)(xu)數據分(fen)(fen)(fen)(fen)(fen)(fen)為若干塊(kuai)進(jin)行(xing)分(fen)(fen)(fen)(fen)(fen)(fen)塊(kuai)排(pai)(pai)序(xu)(xu)，而在每趟排(pai)(pai)序(xu)(xu)過程(cheng)(cheng)中(zhong)，以指定的(de)關鍵(jian)(jian)字(zi)(zi)將(jiang)待排(pai)(pai)數據分(fen)(fen)(fen)(fen)(fen)(fen)別(bie)分(fen)(fen)(fen)(fen)(fen)(fen)為比關鍵(jian)(jian)字(zi)(zi)大的(de)部分(fen)(fen)(fen)(fen)(fen)(fen)和(he)比關鍵(jian)(jian)字(zi)(zi)小的(de)部分(fen)(fen)(fen)(fen)(fen)(fen)，反復上述過程(cheng)(cheng)，將(jiang)整(zheng)個待排(pai)(pai)數列分(fen)(fen)(fen)(fen)(fen)(fen)散為若干個小數列而分(fen)(fen)(fen)(fen)(fen)(fen)別(bie)進(jin)行(xing)排(pai)(pai)序(xu)(xu)操作。假設我們(men)現(xian)對(dui)一列數進(jin)行(xing)快速排(pai)(pai)序(xu)(xu)，其C語(yu)言代碼實(shi)現(xian)如下：

#include <stdio.h>
        int partition(int *data,int low,int high)
        {       int t = 0;
                t = data[low];
                while(low < high)
                {       while(low < high && data[high] >= t)
                                high--;
                        data[low] = data[high];
                        while(low < high && data[low] <= t)
                                low++;
                        data[high] = data[low];
                }
                data[low] = t;
                return low;
  &nbsp;   &nbsp; }

void sort(int *data,int low,int high)        //快排每趟進行時的樞軸要重新確定，由此進 //一步確定每個待排小記錄的low及high的值
        {       if(low >= high)
                        return ;
                int pivotloc = 0;
                pivotloc = partition(data,low,high);
                sort(data,low,pivotloc-1);
                sort(data,pivotloc+1,high);
        }
        void quick_sort(int *data,int n)         //該函數進行sort過程的調用
        {        &nbsp;sort(data,0,n-1); }

int main()
        {       int i;
                int data[]={49,38,32,98,65,74,12,8};
                quick_sort(data,sizeof(data)/sizeof(int));
                for( i = 0 ; i < sizeof(data)/sizeof(int); i++)
                printf("%d ",data[i]);
                printf("\n");
                return 0;
    &nbsp;   }