如何有效地排序没有库的双打数组?

时间:2013-04-02 16:28:44

标签: c++ c sorting

我正在寻找一种有效的方法来对双打数组进行排序。我知道冒泡排序和选择排序,它们似乎都不够快。我读到了快速排序,但我不明白它是如何工作的。有很多示例源代码,但所有这些都没有得到很好的评论。有人可以向我解释一下吗?

1 个答案:

答案 0 :(得分:1)

我在了解了qsort的工作原理之后写了这篇文章。我觉得qsort并不那么容易理解。它可能需要一些优化,并且与原始qsort相比可能没有,但在这里它是。感谢那位试图帮助解决这个问题的人。

/*recursive sorting, throws smaller values to left,
bigger to right side, than recursively sorts the two sides.*/
void sort(double szam[], int eleje, int vege){
  if (vege > eleje + 1){            //if I have at least two numbers
    double kuszob = szam[eleje];    //compare values to this.
    int l = eleje + 1;              //biggest index that is on the left.
    int r = vege;                   //smallest index that is on the right side.
    while (l < r){                  //if I haven't processed everything.
      if (szam[l] <= kuszob) l++;   //good, this remains on the left.
      else
        swap(&szam[l], &szam[--r]); //swap it with the farthest value we haven't checked.
    }
    swap(&szam[--l], &szam[eleje]); //make sure we don't compare to this again, that could cause STACK OVERFLOW
    sort(szam, eleje, l);           //sort left side
    sort(szam, r, vege);            //sort right side
  }
  return;                           //if I have 1 number break recursion.
}