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php实现快速排序法函数代码_PHP

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Release: 2016-06-01 12:09:46
Original
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代码1:
复制代码 代码如下:
function quicksort($str){
if(count($str)$key=$str[0];//取一个值,稍后用来比较;
$left_arr=array();
$right_arr=array();
for($i=1;$iif($str[$i]$left_arr[]=$str[$i];
else
$right_arr[]=$str[$i];
}
$left_arr=quicksort($left_arr);//进行递归;
$right_arr=quicksort($right_arr);
return array_merge($left_arr,array($key),$right_arr);//将左中右的值合并成一个数组;
}//以下是测试
$str=array(5,3,8,2,5,9,7,2,1,4,0);
print_r(quicksort($str));
?>

代码2:
复制代码 代码如下:
/* @快速排序法*/
function quickSort($left,$right,$arr){
$l = $left;
$r = $right;
$pivot = $arr[($left+$right)/2];
$temp = 0;

while($lwhile($arr[$l]$l++;
}
while($arr[$r]>$pivot){
$r--;
}

if($l>=$r) break;

$temp = $arr[$l];
$arr[$l] = $arr[$r];
$arr[$r] = $temp;

if($arr[$l]==$pivot) --$r;
if($arr[$r]==$pivot) ++$l;
}

if($l==$r){
$l++;
$r--;
}

if($leftquickSort($left, $r, $arr);
}elseif($right>$l){
quickSort($l, $right, $arr);
}else{
return $arr;
}
}

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