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这定理太强大了！~~

Posted by inowfordream at 2009-11-27 21:00:54 on Problem 2960
In Reply To:Sprague-Grundy定理 Posted by:20062875 at 2009-05-05 10:15:47 
> Sprague-Grundy定理：游戏和的SG函数等于各子游戏SG函数的Nim和（二进制异或）
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