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DFS+记忆表能过，内附一些说明……

Posted by erex at 2009-07-27 14:02:52 on Problem 1143 
假如是A和B进行对弈，A先走一步，那这一步怎么能能算WINNING MOVE?
对于B，无论走哪一步，A都可以找到一条不输的路径就算。
也就是说，如果B能找到一个必胜的走法，那么此时A的就不算WINNING MOVE。

关于位运算的技巧是，把一个整数的位用来标记1到20，这样就可以用记忆化的表，不然会超时……
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