Most of us would agree that this is an easily recognizable profile, and it is a puzzle why the manual's committee on personality disorders has decided to throw N. P. D. off the bus.
大多数人会同意这是一个容易辨认的特点，而令人费解的是为什么该手册的人格障碍分析委员会决定排除掉自恋型人格障碍。
This method almost immediately gives a solution to N-puzzle problem, however it is usually not the optimal one.
解法能在很短时间内给出N数码的一个解，不过这个解通常不是最优解。
If N is even, transpose the puzzle.
如果N是偶数，交换行列。
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