58 人解决，127 人已尝试。
66 份提交通过，共有 1067 份提交。
5.7 EMB 奖励。
单点时限: 1.0 sec
内存限制: 256 MB
Hazy moonlight poors on $n\times m$ ponds，which are lined up as a matrix with $n$ rows and $m$ columns.
The pond located at the $i$-th row and the $j$-th column contains $a_{i,j}$ lotus flowers (where $1\le i\le n,1\le j\le m$).
Now，the Plovery Frog plans to choose a sub-matrix，and then merge all of the ponds in it. And he hopes that the huge merged ponds will contains exactly $k$ lotus flowers.
So，the Plovery Frog wants to know that，how many different ways choosing the sub-matrix can meets his requirement.
In other words,
he wants to know the number of tuples in format $(l_1,r_1,l_2,r_2),\ 1\le l_1\le r_1\le n,1\le l_2\le r_2\le m $ ，which makes below constraint satisfied：
$$
\bigg(\sum_{i=l_1}^{r_1}\sum_{j=l_2}^{r_2}a_{i,j} \bigg)= k
$$
The first line contains an integer $T\ (1\le T)$ denoting the number of test cases.
There are $T$ test cases, for each one：
The first line contains $2$ integers $n,m\ (1\le n,m \le 10^5)$ ,denoting the number of the rows and columns in the matrix.
For the next $n$ lines, each line contains $m$ integers，the integer located at the $i$-th line and the $j$-th column is $a_{i,j}\ (0\le a_{i,j}\le 10^9)$.
The next line contains an integer, $k\ (0\le k\le 10^{14})$ , denoting the required sum of the elements in the sub-matrix.
For all of the $T$ test cases，$\sum n\times m \le 2\times10^5$ is satisfied.
For each test case, output a line, which contains an integer as your answer.
2 2 2 1 9 0 5 1 5 5 3 1 4 1 5 9 2 6 5 3 5 3 8 4 6 2 6 4 3 3 8 3 2 7 9 19
2 7
58 人解决，127 人已尝试。
66 份提交通过，共有 1067 份提交。
5.7 EMB 奖励。
创建: 2 年，2 月前.
修改: 2 年，2 月前.
最后提交: 1 年，9 月前.
来源: N/A