PHP一个简单的快速排序
时间：2021-07-01 10:21:17
帮助过：25人阅读
通过不断的定位基准数的位置来实现快速排序 - /**
- * Created by PhpStorm.
- * User: saint
- * Date: 15/8/5
- * Time: 上午11:49
- */
- class Demo
- {
- public $a = array(3, 6, 9, 2, 4, 7, 1, 5, 8, 0);
-
- public function qsort($left, $right)
- {
- if($left > $right) {
- return;
- }
-
- $i = $left;
- $j = $right;
- $standard = $this->a[$left];
-
- while($i != $j) {
-
- // 从右向左查找比基准数小的单元
- while(($standard <= $this->a[$j]) && ($j > $i)) {
- $j--;
- }
-
- // 从左到右查找比基准数大的
- while(($standard >= $this->a[$i]) && ($j > $i)) {
- $i++;
- }
-
- $tmp = $this->a[$i];
- $this->a[$i] = $this->a[$j];
- $this->a[$j] = $tmp;
- }
-
- // 确定基准数的位置
- $this->a[$left] = $this->a[$i];
- $this->a[$i] = $standard;
-
- $this->qsort($left, $i - 1);
- $this->qsort($i + 1, $right);
- }
-
- // 执行函数
- public function main()
- {
- $left = 0;
- $right = count($this->a) - 1;
- $this->qsort($left, $right);
- print_r($this->a);
- }
- }
-
- $demo = new Demo();
- $demo->main();
来自：http://my.oschina.net/liuke1556/blog/488215 |
PHP
