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奇怪，G++中cout比较快么？

Posted by ZxMYS2 at 2009-06-10 17:12:02 on Problem 2761 and last updated at 2009-06-10 17:13:47 
5286723	ZxMYS2	2761	Accepted	3296K	2313MS	G++	2654B	2009-06-10 17:04:49
5286695	ZxMYS2	2761	Accepted	3304K	1438MS	G++	2522B	2009-06-10 17:00:15

上面一个是printf，下面一个是cout
cout居然比printf快这么多……
但是如果用C++编译的话，情况又反过来了(正常了)

不明白为什么……

（code length不一样是因为我加了一些注释在头部）
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