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要推也很“容易”啊，不过我郁闷了两天才发现是这么简单的……

Posted by frkstyc at 2005-06-14 20:09:07 on Problem 2229
In Reply To:ft，你不刚过了么，怎么还问？ Posted by:frkstyc at 2005-06-14 20:06:28 
如果是奇数的话肯定有一个1，所以可以拿掉
如果是偶数的话，要么有两个1，或者全是偶数，前者就拿掉两个1，后者就全部除2
所以就是那样子啦
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