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本来我还不信要倒着搜....正这搜TLE 倒过来就79msAC.. 而且试了下评论区里的数据，正这搜十几秒没结果，倒着搜2秒出结果.... 什么原理..讲道理对于足够多的随机数据，正反应该差不多的毕竟对称。。 Followed by:
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