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终于过了。。。。。

Posted by Berry at 2007-08-18 11:08:25 on Problem 2893 
说一下我感觉要注意的地方：
没必要按解题报告说的在N是偶数的时候交换行列顺序，直接按行为主写成一维数组求逆序数即可，
0也是要放到序列中去一起求逆序数的
在M，N有一个为偶数时，目标序列的逆序数为M*N-1，是一个奇数；
最后还要加上0到目标位置的曼哈顿距离；
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