Distinct Rows in Submatrices

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###Read problems statements [Hindi](http://www.codechef.com/download/translated/OCT18/hindi/DISTRING.pdf) ,[Bengali](http://www.codechef.com/download/translated/OCT18/bengali/DISTRING.pdf) , [Mandarin chinese](http://www.codechef.com/download/translated/OCT18/mandarin/DISTRING.pdf) , [Russian](http://www.codechef.com/download/translated/OCT18/russian/DISTRING.pdf) and [Vietnamese](http://www.codechef.com/download/translated/OCT18/vietnamese/DISTRING.pdf) as well. Let's define the *strength* of a matrix as the number of distinct rows in it. Two rows $a_1, a_2, \dots, a_n$ and $b_1, b_2, \dots, b_n$ are distinct if there is an index $i$ such that $a_i \neq b_i$. You are given an integer matrix $A$ with $N$ rows (numbered $1$ through $N$) and $M$ columns (numbered $1$ through $M$). A submatrix of $A$ is formed as the intersection of rows $r_1$ through $r_2$ and columns $c_1$ through $c_2$ for any $r_1 \le r_2, c_1 \le c_2$. Find the sum of the strengths of all submatrices of $A$. ### Input  The first line of the input contains two spaceseparated integers $N$ and $M$.  $N$ lines follow. For each $i$ ($1 \le i \le N$), the $i$th of these lines contains $M$ spaceseparated integers $A_{i, 1}, A_{i, 2}, \dots, A_{i, M}$. ### Output Print a single line containing one integer — the sum of strengths of all the submatrices. ### Constraints  $1 \le N \cdot M \le 500,000$  $ 1 \le A_{i,j} \le 10^9$ for each valid $i, j$ ### Subtasks **Subtask #1 (20 points):** $1 \le N \cdot M \le 1,000$ **Subtask #2 (80 points):** original constraints ### Example Input ``` 2 2 1 1 1 2 ``` ### Example Output ``` 11 ``` ### Explanation The submatrices are ``` 1 1 1 2 1 1 1 2 1 1 1 2 1 1 1 2 ``` with strengths $1, 1, 1, 1, 1, 1, 1, 2, 2$ respectively. The sum of these strengths is $11$.Author:  jtnydv25 
Tags  jtnydv25 
Date Added:  24092018 
Time Limit:  2 sec 
Source Limit:  50000 Bytes 
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