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php实现猴子选大王问题算法实例

   下面为你介绍php实现猴子选大王问题算法实例。

         本文实例讲述了php实现猴子选大王问题算法。分享给大家供大家参考。具体分析如下:

  一、问题:

  n只猴子围坐成一个圈,按顺时针方向从1到n编号。

  然后从1号猴子开始沿顺时针方向从1开始报数,报到m的猴子出局,再从刚出局猴子的下一个位置重新开始报数,

  如此重复,直至剩下一个猴子,它就是大王。

  设计并编写程序,实现如下功能:

  (1) 要求由用户输入开始时的猴子数$n、报数的最后一个数$m。

  (2) 给出当选猴王的初始编号。

  二、解决方法:

  ?

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/**

* @param int $n 开始时的猴子数量

* @param int $m 报道的最后一个数

*(报到这个数的猴子被淘汰,然后下一个猴子重新从①开始报数)

* @return int 猴子的初始编号

*/

function monkeySelectKing($n,$m)

{

//猴子的初始数量不能小于2

if ($n

{

return false;

}

 

$arr=range(1,$n);

//将猴子分到一个数组里, 数组的值对应猴子的初始编号

$unsetNum=0;

//定义一个变量,记录猴子的报数

 

for ($i = 2; $i

//总的循环次数不知道怎么计算,

{

//不过因为循环中设置了return,所以$m*$len效率还可以

foreach ($arr as $k => $v)

{

$unsetNum++; //每到一个猴子, 猴子报数+1

 

//当猴子的报数等于淘汰的数字时:淘汰猴子(删除数组元素)

//报数归0(下一个猴子从1开始数)

if ($unsetNum==$m)

{

// echo "

";//打开注释,可以看到具体的淘汰过程
            <p>// print_r($arr);</p>
            <p>unset($arr[$k]);</p>
            <p>//淘汰猴子</p>
            <p>$unsetNum=0;</p>
            <p>//报数归零</p>
            <p>if (count($arr)==1)</p>
            <p>//判断数组的长度, 如果只剩一个猴子, 返回它的值</p>
            <p>{</p>
            <p>return reset($arr);</p>
            <p>}</p>
            <p>}</p>
            <p>}</p>
            <p>}</p>
            <p>}</p>
            <p> </p>
            <p>var_dump(monkeySelectKing(6,  3));</p>
            
            

  补充改进算法(该算法更加简洁明了!):

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function yuesefu($n,$m) {

$r=0;

for($i=2; $i

 

$r=($r+$m)%$i;

}

return $r+1;

}

print_r(yuesefu(3,3));

  希望本文所述对大家的php程序算法设计有所帮助。

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