Problem 3776 --Maximal submatrix

3776: Maximal submatrix

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Time Limit $1$ 秒/Second(s) Memory Limit $128$ 兆字节/Megabyte(s)
提交总数 $0$ 正确数量 $0$
裁判形式 标准裁判/Standard Judge 我的状态 尚未尝试
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Description

Given a matrix of n rows and m columns,find the largest area submatrix which is non decreasing on each column

Input

The first line contains an integer T(1≤T≤10)representing the number of test cases.
For each test case, the first line contains two integers n,m(1≤n,m≤2∗103)representing the size of the matrix
the next n line followed. the i-th line contains m integers vij(1≤vij≤5∗103)representing the value of matrix
It is guaranteed that there are no more than 2 test cases with n∗m>10000
 

Output

For each test case, print a integer representing the Maximal submatrix

Sample Input复制

1
2 3
1 2 4
2 3 3

Sample Output复制

4

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