HDU 2859 Phalanx（对称矩阵 经典dp样例）

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http://acm.hdu.edu.cn/showproblem.php?pid=2859

Phalanx

Time Limit: 10000/5000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)
Total Submission(s): 2792    Accepted Submission(s): 1357

Problem Description Today is army day, but the servicemen are busy with the phalanx for the celebration of the 60th anniversary of the PRC.
A phalanx is a matrix of size n*n, each element is a character (a~z or A~Z), standing for the military branch of the servicemen on that position.
For some special requirement it has to find out the size of the max symmetrical sub-array. And with no doubt, the Central Military Committee gave this task to ALPCs.
A symmetrical matrix is such a matrix that it is symmetrical by the “left-down to right-up” line. The element on the corresponding place should be the same. For example, here is a 3*3 symmetrical matrix:
cbx
cpb
zcc  

 

Input There are several test cases in the input file. Each case starts with an integer n (0 

Output Each test case output one line, the size of the maximum symmetrical sub- matrix.

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