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方格取数(1)

Time Limit: 10000/5000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)
Total Submission(s): 16320    Accepted Submission(s): 5727


Problem Description
给你一个n*n的格子的棋盘，每个格子里面有一个非负数。
从中取出若干个数，使得任意的两个数所在的格子没有公共边，就是说所取的数所在的2个格子不能相邻，并且取出的数的和最大。
 

Input
包括多个测试实例，每个测试实例包括一个整数n 和n*n个非负数(n<=20)
 

Output
对于每个测试实例，输出可能取得的最大的和
 

Sample Input
3
75 15 21 
75 15 28 
34 70 5
 

Sample Output
188
 

Author
ailyanlu
 

Source
Happy 2007
 

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