Problem2027--noip2014 子矩阵

2027: noip2014 子矩阵

Time Limit: 1 Sec  Memory Limit: 128 MB
Submit: 2  Solved: 1
[Status] [Submit] [Creator:]

Description

Sample Input Copy 

5 5 2 3
9 3 3 3 9
9 4 8 7 4
1 7 4 6 6
6 8 5 6 9
7 4 5 6 1

Sample Output Copy 

6

HINT

Source/Category

noip noip2014 noip普及组 
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