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我来把IKKI的话转载一下

Posted by TN at 2005-07-06 16:54:11 on Problem 2461
In Reply To:The m-th row of the matrix has every m-th bit of the original string starting with the m-th bit.什么意思呀? Posted by:LiHaoyuan at 2005-07-06 16:48:57
every 2nd bit
就是把原串接上一个x
1001x1001x1001x1001x
然后这样一直取
每个两个取一次 

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