Home >Backend Development >PHP Tutorial >php实现插入排序_php技巧

php实现插入排序_php技巧

WBOY
WBOYOriginal
2016-05-16 20:19:02920browse
<&#63;php
/**
 * 插入排序
 * @param Array $a 无序集合
 * @return Array 有序集合
 */
function insertSort($a) {
  $temp;
  $i;
  $j;
  $size_a = count($a);
  # 从第二个元素开始
  for ($i = 1; $i < $size_a; $i++) {      
    if ($a[$i] < $a[$i-1]) {     
      $j = $i; # 保存当前元素的位置
      $temp = $a[$i]; # 当前元素的值  
 
      # 比较左边的元素,如果找到比自己更小的,向右移动元素,否则插入元素到当前位置
      while($j>0 && $temp<$a[$j-1]) {
        $a[$j] = $a[$j-1];
        $j--;
      }
       
      # 插入元素
      $a[$j] = $temp;
    }
  }
  return $a;
}
/**
 * 获取随机数
 * @param Integer $size 数量
 * @return Integer
 */
function randomNumber($size = 10) {
  $rand = array();
  srand(time(NULL));
  for ($i = 0; $i < $size; $i++) {
    array_push($rand, mt_rand(0,1000));   
  }
  return $rand;
}
 
$a = randomNumber();
echo sprintf("Unsorted list %s\n", implode(" ", $a));
echo sprintf("Sorted list %s\n", implode(" ", insertSort($a)));

以上就是本文所述的全部内容了,希望大家能够喜欢。

Statement:
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn