PHP implements random elimination algorithm

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Release: 2023-03-25 21:30:01
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This time I will bring you PHP to implement the random elimination algorithm. What are the precautions for PHP to implement the random elimination algorithm? The following is a practical case, let's take a look.

<?php
function getKingMokey($n, $m)
{
    $monkey[0] = 0;
    //将1-n只猴子顺序编号 入数组中
    for($i= 1; $i<= $n; $i++)
    {
        $monkey[$i] = $i;
    }
    $len = count($monkey);
    //循环遍历数组元素(猴子编号)
    for($i= 0; $i< $len; $i= $i)
    {
       $num = 0;
       foreach($monkey as $key => $value)
       {
        if($value == 0) continue;
        $num++;
        $values = $value;
       }
       //若只剩一只猴子 则输出该猴子编号(数组元素值) 并退出循环
       if($num == 1)
       {
          echo $values;
          exit;
       }
       //将第$i只猴子踢出队伍(相应数组位置元素值设为0)
       $monkey[$i] = 0;
       //打印该猴子位置
       echo $i."";
       //设置计数器
       for($j= 1; $j<= $m; $j++)
       {
          //猴子编号加一,遍历下一只猴子
          $i++;
          //若该猴子未被踢出队伍,获取下一只猴子编号
          if($monkey[$i] > 0) continue;
          //若元素值为0,则猴子已被踢出队伍,进而循环取下一只猴子编号
          if($monkey[$i] == 0)
          {
              //取下一只猴子编号
              for($k= $i; $k< $len; $k++)
              {
                  //值为0,编号加1
                  if($monkey[$k] == 0) $i++;
                  //否则,编号已取得,退出
                  if($monkey[$k] > 0) break;
              }
          }
          //若编号大于猴子个数,则从第0只猴子开始遍历(数组指针归零)
          //步骤同上
          if($i == $len) $i = 0;
          //同上步骤,获取下一只猴子编号
          if($monkey[$i] == 0)
          {
             for($k= $i; $k< $len; $k++)
             {
                  if($monkey[$k] == 0) $i++;
                 if($monkey[$k] > 0) break;
             }
          }
      }
   }
}
//猴子个数
$n = 10;
//踢出队伍的编号间隔值
$m = 3;
//调用猴王获取函数
getKingMokey($n, $m);
?>
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Running result:

036927185104

##Using recursive algorithm

$monkeys = array(1 , 2 , 3 , 4 , 5 , 6 , 7, 8 , 9 , 10); //monkey的编号
$m = 4; //数到第几只的那只猴子被踢出去
function killMonkey($monkeys , $m , $current = 0){
  $number = count($monkeys);
    $num = 1;
    if(count($monkeys) == 1){
      echo $monkeys[0]."成为猴王了";
      return;
    }
    else{
      while($num++ < $m){
          $current++ ;
          $current = $current%$number;
        }
        echo $monkeys[$current]."的猴子被踢掉了<br/>";
        array_splice($monkeys , $current , 1);
        killMonkey($monkeys , $m , $current);
    }
}
killMonkey($monkeys , $m);
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Running result:

4的猴子被踢掉了
8的猴子被踢掉了
2的猴子被踢掉了
7的猴子被踢掉了
3的猴子被踢掉了
10的猴子被踢掉了
9的猴子被踢掉了
1的猴子被踢掉了
6的猴子被踢掉了
5成为猴王了
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I believe you have mastered the method after reading the case in this article. For more exciting information, please pay attention to other related articles on the php Chinese website!

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The above is the detailed content of PHP implements random elimination algorithm. For more information, please follow other related articles on the PHP Chinese website!

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