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Re:what should be the reuslt for:

Posted by kevinew at 2007-04-28 22:18:37 on Problem 3218
In Reply To:what should be the reuslt for: Posted by:cnhawk at 2007-04-28 13:41:08
应该是
a b
吧
但是这点感觉题目里没有描述清楚

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