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诶大家一张图···先猜猜其实原理真的看了很久没怎么懂.....明天早起继续弄完这个要开始进入c和stm32 明天最后一天
oh，there is picture for you .You may know what this is. But the theory is still a mystery......Tommorrow was the last day in algorithm.
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原文地址：http://www.cnblogs.com/bigben/p/4276173.html
