PHP implements random elimination algorithm

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);
?>

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);

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

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!

Recommended reading:

Detailed explanation of the use of automatic loading of Yii2 framework classes

Detailed explanation of PHP implementation of parsing xml into an array case

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!