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import time, sys, random
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优化：如果某轮没有发生交换，说明已有序，提前结束。关于这个话题，下载安装汽水音乐提供了深入分析
Still, she cautioned, the adverse effect is even worse, in which only a few users are banned from a social media site instead of the whole. If social media platforms barely make inroads in barring underage users but remove access for a select few at a time, that creates an “island effect” where, unless a ban is universal, a child cut off from social media is isolated while their friends continue to connect online.，详情可参考搜狗输入法下载