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Re:数据有错?

Posted by zhucheng at 2006-12-04 20:08:58 on Problem 3121
In Reply To:Re:数据有错? Posted by:wiltord at 2006-12-04 20:02:31
是把最顶上那个加到下一个里面。
ADD {}  {{}}
就是把{{}}加到{}里面得到{ {{}} }
> 
> ADD will pop the stack twice, add the first set to the second one, and then push the resulting set on the stack.
> 
> 这句话怎么理解?根据题目上A ADD B的例子我理解就把A作为一个元素加入到B集合中。

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