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[找工就业] 一道OA题目 求思路

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snakefly 发表于 2016-2-4 11:30:22 | 显示全部楼层 |阅读模式

2016(4-6月)-[15]CS硕士+fresh grad 无实习/全职 - Other| 码农类General其他@fresh grad应届毕业生

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来自codeassess  求这里的OA tips.
问题如下:




Write a program that takes one integer N and an array of N * N elements (the first line contains the integer N and the next N lines contain N integers each, representing the two dimensional array). Your program should give as output the size of the maximum square array (an array of size M * M) that is a magic square and is a sub-array of the inputted array. A magic square is a square of numbers such that when you pick any set of N cells from that square, each cell from the set doesn't share a row or a column with any other cell from that set, and the sum of those N cells is the same for each such possible set of cells.


Example

Case 1:. 牛人云集,一亩三分地

For the input provided as follows:

2
23 40
. Waral 博客有更多文章,9 26. 一亩-三分-地,独家发布

Output of the program will be:

2

Description:
. 围观我们@1point 3 acres
As 23 + 26 is equal to 40 + 9, the inputted array is a magic square, giving us a maximum answer of 2.

Case 2:

For the input provided as follows:. more info on 1point3acres

4
-41 -29 2 1
28 40 71 2
11 23 54 3
4 5 6 7 8

Output of the program will be:.留学论坛-一亩-三分地

3

Description:

As the inputted array is not a magic square, the answer can not be 4. Looking at all the possible square arrays, we can check that the maximum answer is 3 with the following 3 x 3 array:

-41 -29 2
28 40 71
11 23 54-google 1point3acres

本版积分规则

提醒:发帖可以选择内容隐藏,部分板块支持匿名发帖。请认真读完以下全部说明:

■隐藏内容方法: [hide=200]你想要隐藏的内容比如面经[/hide]
■意思是:用户积分低于200则看不到被隐藏的内容
■可以自行设置积分值,不建议太高(200以上太多人看不到),也不建议太低(那就没必要隐藏了)
■建议只隐藏关键内容,比如具体的面试题目、涉及隐私的信息,大部分内容没必要隐藏。
■微信/QQ/电子邮件等,为防止将来被骚扰甚至人肉,以论坛私信方式发给对方最安全。
■匿名发帖的板块和方法:http://www.1point3acres.com/bbs/thread-405991-1-1.html

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