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显然，这个题目数据我自己做的，都是从输入倒推出输入的

Posted by hawk at 2004-09-24 23:16:08 on Problem 1147
In Reply To:该题，可以保证输入数据都有合法输出吗？ Posted by:gogo_ccnu at 2004-09-24 23:08:17 
> 例如： 
> 4
> 0 1 0 1
> 3
> 1 0 1
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