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);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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