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终于找出错误了

Posted by zhujie at 2006-03-15 09:29:25 on Problem 1083
In Reply To:郁闷，这题数据有什么玄机吗？为什么一直WA Posted by:zhujie at 2006-03-14 22:58:00 
原来是在交换的时候最后一句写成了up = down了，晕，这种低级错误也犯，害我WA了N多次。
像这种交换的语句平时写了好多了，自以为闭着眼睛也能写出来了，没想到...............
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