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PHP兑现各种排序

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2016-06-13 13:16:48767browse

PHP实现各种排序

<?php /**
 * 各种排序
 * @author zhaojaingwei
 * @since 2011/11/21 16:14
 *
 */

$list = array(3,5,1,2,10,8,15,19,20);

//快排
function fast(&$list, $low, $high){
    if($high - $low > 5){
        while($low  $temp){
            $high --;
        }

        $list[$low] = $list[$high];

        while($low  0; $i --){
        swap($list, $i, 0);
        heapfy($list, 0, $i - 1); 
    }
}

//创建堆
function buildHeap(&$list){
    for($i = (count($list) - 2)/2; $i >= 0; $i --){
         heapfy($list, $i, count($list) - 1);  
    }
}

//维护堆
function heapfy(&$list, $low, $high){
    $temp = $list[$low];

    for($i = ($low * 2 + 1); $i = 1){
        for($i = $code; $i = 0 && $list[$j] > $temp; $j -= $code){
                    $list[$j + $code] = $list[$j];
                    $a ++; 
                }
                $list[$j + $code] = $temp;
            }
        }

        $code = $code/3;
    }

    echo $a;
}

//直接插入排序
function insert(&$list){
    $a = 0;
    for($i = 1; $i  $temp; $j --){
                $a ++;
                $list[$j + 1] = $list[$j]; 
            }
            
            $list[$j + 1] = $temp;
        }
    }

    echo $a;
}

//简单选择排序
function select(&$list){
    $a = 0;
    for($i = 0; $i = $i; $j --){
            $a ++;
            if($list[$j] > $list[$j + 1]){
                $swap = TRUE;
                swap($list, $j, $j + 1);
            }
        }
    }
    echo $a;
}

//移动或交换函数
function swap(&$list, $i, $j){
    $temp = $list[$i];
    $list[$i] = $list[$j];
    $list[$j] = $temp;
}

?>
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