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一个游戏的解答

May 25, 2016 pm 05:12 PM

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[&#39;p&#39; . $i];
    unset($arr[&#39;p&#39; . $i]);
    $j = $p[0];
    $k = $p[1];
    $arr[&#39;p&#39; . $j][1] = $k;
    $arr[&#39;p&#39; . $k][0] = $j;
    $i = $arr[&#39;p&#39; . $k][1];
}
// 看看还剩谁
print_r($arr);

// 结果:64
?>
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