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原来这题很早之前我看过的，怎么感觉以前好难啊。昨天一看觉得好简单啊。In Reply To:Re:直接枚举？怀疑看错题了。c(n,k)*(1<<k)的复杂度过了。 Posted by:yygy at 2014-07-25 11:12:27 Followed by: Post your reply here: |
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