php堆排序(heapsort)练习_PHP
复制代码 代码如下:
//堆排序应用
class heapsort
{
var $a;
function setarray($a)//取得数组
{
$this->a=$a;
}
function runvalue($b,$c)//$a 代表数组,$b代表排序堆,$c代表结束点,
{
while($b {
$h1=2*$b;
$h2=(2*$b+1);
if($h1>$c)
break;
elseif($h1==$c)
{
if($this->a[$b]>$this->a[$h1])
{
$t=$this->a[$b];
$this->a[$b]=$this->a[$h1];
$this->a[$h1]=$t;
$la=1;
}
else
$la=1;
}
elseif(($this->a[$b]>$this->a[$h1])||($this->a[$b]>$this->a[$h2]))
{
if($this->a[$h1]>=$this->a[$h2])
{
$t=$this->a[$h2];
$this->a[$h2]=$this->a[$b];
$this->a[$b]=$t;
$b=$h2;
}
else
{
$t=$this->a[$h1];
$this->a[$h1]=$this->a[$b];
$this->a[$b]=$t;
$b=$h1;
}
}
else
$la=1;
if($la==1)
break;
}
}
function getarray()
{
$all=count($this->a);
$b=Floor(($all-1)/2);
for($i=$b;$i>=1;$i--)//先将数组建立成堆
{
$this->runvalue($i,($all-1));
}
for($i=1;$i {
$a1=($all-$i);
if($i==1)
{
$t=$this->a[1];
$this->a[1]=$this->a[$a1];
$this->a[$a1]=$t;
}
else
{
$end=($all-$i);
$this->runvalue(1,$end);
$t=$this->a[1];
$this->a[1]=$this->a[$end];
$this->a[$end]=$t;
}
}
return $this->a;
}
}
//////
class sortarr
{
var $a;
function setarray($a)//取得数组
{
$this->a=$a;
}
function runvalue($i)
{
$max=$this->a[$i];
$id=$i;
for($j=($i+1);$j
{
if($this->a[$j]>$max)
{
$max=$this->a[$j];
$id=$j;
}
}
if($id!=$i)
{
$t=$this->a[$id];
$this->a[$id]=$this->a[$i];
$this->a[$i]=$t;
}
}
function getarray()
{
for($i=1;$ia)-1);$i++)
$this->runvalue($i);
return $this->a;
}
}
//////
$s=microtime();
$st=explode(' ',$s);
$st1=$st[0];
$st2=$st[1];
//////
$v=10000;//排序数组长度
$brr[0]=0;
for($i=1;$i {
$brr[$i]=rand();
}
$check=2;//1 stand for heapsort 2 stand for another sort
echo'after sort!!
';
if($check==1)
{
$arr=new heapsort;
$arr->setarray($brr);
$ok=$arr->getarray();
for($i=1;$i {
$j=((($i+1)>($v-1))?($v-1):($i+1));
/*
if($ok[$j] echo''.$ok[$i].'
';
else
echo$ok[$i].'
';*/
}
}
elseif($check==2)
{
$arr=new sortarr;
$arr->setarray($brr);
$ok=$arr->getarray();
for($i=1;$i {
$j=((($i+1)>($v-1))?($v-1):($i+1));/*
if($ok[$j] echo''.$ok[$i].'
';
elseif($ok[$j]>$ok[$i])
echo''.$ok[$i].'
';
else
echo$ok[$i].'
';*/
}
}
elseif($check==3)
{
sort($brr);
$ok=$brr;
for($i=1;$i {
$j=((($i+1)>($v-1))?($v-1):($i+1));/*
if($ok[$j] echo''.$ok[$i].'
';
elseif($ok[$j]>$ok[$i])
echo''.$ok[$i].'
';
else
echo$ok[$i].'
';*/
}
}
else
{
echo'参数输入错误!!
';
}
//////
$s=microtime();
$st=explode(' ',$s);
$sta=$st[0];
$stb=$st[1];
$ss1=$sta-$st1;
$ss2=$stb-$st2;
if($check==1)
$word='堆排序';
elseif($check==2)
$word='常规排序';
elseif($check==3)
$word='普通排序';
else
$word='无排序';
echo$word.'对具有'.$v.'个元素的数组排序,消耗了'.($ss2+$ss1).'秒时间';
//////
?>

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