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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