冒泡法排序与二分法查找排序算法是我们在初中时就学过的,下面我来介绍在PHP冒泡法排序与二分法查 找实例,各位同学不防进入参考.
冒泡法排序,随便给出一个乱序数组
$arr = array(0,2,10,9,19,23,89,112,321,234);
统计数组:$num = count($arr);
冒泡倒序排列:
- for($i=0;$i<$num-1;$i++){
- for($m=0;$m<$num-1;$m++){
- if($arr[$m]<$arr[$m+1]){
- $temp = $arr[$m];
- $arr[$m] = $arr[$m+1];
- $arr[$m+1] = $temp;
- }
- // echo $arr[$m].'<br>';
- }
- }
- //输出排序后的结果
- var_dump($arr);
- //冒泡顺序排列
- for($x=0;$x<$num-1;$x++){
- for($y=0;$y<$num-1;$y++){
- if($arr[$y]>$arr[$y+1]){
- $temp = $arr[$y];
- $arr[$y] = $arr[$y+1];
- $arr[$y+1] = $temp;
- }
- }
- }
- //输出排序后的结果
- var_dump($arr);
- //二分法查找
- function dichotomy($array,$k,$low=0,$high=0){
- if(count($array)!= 0 && $high == 0){
- $high = count($array);
- }
- if($low <= $high){
- $mid = intval(($low+$high)/2);
- if( $array[$mid] == $k ){
- return $mid;
- }elseif( $k<$array[$mid]){
- return dichotomy( $array,$k,$low=0,$mid-1);
- }else{
- return dichotomy( $array,$k,$mid+1,$high);
- }
- }else{
- return false;
- }
- }
- //输出查找结果
- echo dichotomy($arr,23);
今天简单的研究了一下最常用的冒泡法排序与二分法查找,写了一个简单的案例,加强自己对php的学习,也希望对今后php学习者能提供一点点的帮助。
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波比源码 » PHP冒泡法排序与二分法查找实例
波比源码 » PHP冒泡法排序与二分法查找实例
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