一个游戏的解答
游戏: 一场作战中,64个人被捉住了,敌方决定按一种方式处理他们,最后剩下的那个人可以活命。该方式为:给所有人编数字号,然后围成一个圈,先杀一号,每隔一个杀一人,直至只剩下一人。杰克果断站在了一个位置上,并最终成功活了下来,请问,他是几号?
<?php $arr = array(); // 初始化 for ($i = 1; $i 1) { $p = $arr['p' . $i]; unset($arr['p' . $i]); $j = $p[0]; $k = $p[1]; $arr['p' . $j][1] = $k; $arr['p' . $k][0] = $j; $i = $arr['p' . $k][1]; } // 看看还剩谁 print_r($arr); // 结果:64 ?>
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