# Number of elements greater than modified mean in matrix

• Last Updated : 29 Apr, 2021

Normally mean of the matrix is the average of all elements present in the matrix. Consider a modified mean as the floor of the mean of the row-wise minimum and column-wise maximum. The row-wise minimum is the minimum element from each row of the given matrix and the column-wise maximum is the maximum element from each column. Given a matrix of order n*m, find the number of elements greater than the new mean obtained.

```mean = floor ( (sum(row-wise Min) + sum (col-wise Max )) /
(row_no. + col_no.) )```

Examples :

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```Input : mat[][] = {1, 5, 6,
2, 3, 0,
5, 2, 8}
Output : 4

Input : mat[][] = {1, 5,
5, 2}
Output : 2```

Find the sum of all row-wise minimum and sum of all column-wise maximum. Take the mean of this sum by dividing the sum value with (n+m) i.e., the total number of rows and columns. Now, as we have the mean of the row-wise minimum and column-wise maximum, iterate over the matrix to find the number of elements greater than the calculated mean.
Below is the implementation of the above approach:

## C++

 `// CPP program to count number of``// elements greater than mean``#include ``using` `namespace` `std;` `// define constant for row and column``#define n 4``#define m 5` `// function to count elements``// greater than mean``int` `countElements(``int` `mat[][m])``{``    ``// For each row find minimum``    ``// element and add to rowSum``    ``int` `rowSum = 0;``    ``for` `(``int` `i = 0; i < n; i++) {``        ``int` `min = mat[i][0];``        ``for` `(``int` `j = 1; j < m; j++)``            ``if` `(mat[i][j] < min)``                ``min = mat[i][j];``        ``rowSum += min;``    ``}``    ` `    ``// For each column find maximum``    ``// element and add to colSum``    ``int` `colSum = 0;``    ``for` `(``int` `i = 0; i < m; i++) {``        ``int` `max = mat[0][i];``        ``for` `(``int` `j = 1; j < n; j++)``            ``if` `(max < mat[j][i])``                ``max = mat[j][i];``        ``colSum += max;``    ``}` `    ``// Calculate mean of row-wise``    ``// minimum and column wise maximum``    ``int` `mean = (rowSum + colSum) / (m + n);``    ` `    ``// For whole matrix count``    ``// elements greater than mean``    ``int` `count = 0;``    ``for` `(``int` `i = 0; i < n; i++)``        ``for` `(``int` `j = 0; j < m; j++)``            ``if` `(mean < mat[i][j])``                ``count++;``    ``return` `count;``}` `// driver function``int` `main()``{``    ``int` `mat[n][m] = { 5, 4, 2, 8, 7,``                      ``1, 5, 8, 3, 4,``                      ``8, 5, 4, 6, 0,``                      ``2, 5, 8, 9, 4 };``    ``cout << countElements(mat);``    ``return` `0;``}`

## Java

 `// Java program to count``// number of elements``// greater than mean``class` `GFG {``    ` `    ``static` `int` `n = ``4``, m = ``5``;``    ` `    ``// function to count``    ``// elements greater``    ``// than mean``    ``static` `int` `countElements(``int` `mat[][])``    ``{``        ``// For each row find``        ``// minimum element``        ``// and add to rowSum``        ``int` `rowSum = ``0``;``        ``for` `(``int` `i = ``0``; i < n; i++)``        ``{``            ``int` `min = mat[i][``0``];``        ` `            ``for` `(``int` `j = ``1``; j < m; j++)``                ``if` `(mat[i][j] < min)``                    ``min = mat[i][j];``            ` `            ``rowSum += min;``        ``}``        ` `        ``// For each column``        ``// find maximum``        ``// element and add``        ``// to colSum``        ``int` `colSum = ``0``;``        ``for` `(``int` `i = ``0``; i < m; i++) {``            ``int` `max = mat[``0``][i];``        ` `            ``for` `(``int` `j = ``1``; j < n; j++)``                ``if` `(max < mat[j][i])``                    ``max = mat[j][i];``        ` `            ``colSum += max;``        ``}``    ` `        ``// Calculate mean of``        ``// row-wise minimum``        ``// and column wise``        ``// maximum``        ``int` `mean = (rowSum + colSum) / (m + n);``        ` `        ``// For whole matrix``        ``// count elements``        ``// greater than mean``        ``int` `count = ``0``;``        ``for` `(``int` `i = ``0``; i < n; i++)``            ``for` `(``int` `j = ``0``; j < m; j++)``        ` `                ``if` `(mean < mat[i][j])``                    ``count++;``        ` `        ``return` `count;``    ``}``    ` `    ``// driver function``    ``public` `static` `void` `main(String[] args)``    ``{``        ``int` `mat[][] = {{ ``5``, ``4``, ``2``, ``8``, ``7``},``                        ``{``1``, ``5``, ``8``, ``3``, ``4``},``                        ``{``8``, ``5``, ``4``, ``6``, ``0``},``                        ``{``2``, ``5``, ``8``, ``9``, ``4``}};``        ``System.out.println(countElements(mat));``    ``}``}` `// This article is contribute by Prerna Saini.`

## Python3

 `# Python3 program to count``# number of elements``# greater than mean``n ``=` `4``;``m ``=` `5``;` `# Function to count``# elements greater``# than mean``def` `countElements(mat):``  ` `    ``# For each row find``    ``# minimum element``    ``# and add to rowSum``    ``rowSum ``=` `0``;``    ` `    ``for` `i ``in` `range``(n):``        ``min` `=` `mat[i][``0``];``        ``for` `j ``in` `range``(``1``, m):``            ``if` `(mat[i][j] < ``min``):``                ``min` `=` `mat[i][j];` `        ``rowSum ``+``=` `min``;` `    ``# For each column``    ``# find maximum``    ``# element and add``    ``# to colSum``    ``colSum ``=` `0``;``    ` `    ``for` `i ``in` `range``(m):``        ``max` `=` `mat[``0``][i];``        ``for` `j ``in` `range``(``1``, n):``            ``if` `(``max` `< mat[j][i]):``                ``max` `=` `mat[j][i];` `        ``colSum ``+``=` `max``;` `    ``# Calculate mean of``    ``# row-wise minimum``    ``# and column wise``    ``# maximum``    ``mean ``=` `((rowSum ``+` `colSum) ``/``           ``(m ``+` `n));` `    ``# For whole matrix``    ``# count elements``    ``# greater than mean``    ``count ``=` `0``;``    ``for` `i ``in` `range``(n):``        ``for` `j ``in` `range``(m):``            ``if` `(mean < mat[i][j]):``                ``count ``+``=` `1``;` `    ``return` `count;` `# Driver code``if` `__name__ ``=``=` `'__main__'``:``  ` `    ``mat ``=` `[[``5``, ``4``, ``2``, ``8``, ``7``],``           ``[``1``, ``5``, ``8``, ``3``, ``4``],``           ``[``8``, ``5``, ``4``, ``6``, ``0``],``           ``[``2``, ``5``, ``8``, ``9``, ``4``]];``    ``print``(countElements(mat));` `# This code is contributed by 29AjayKumar`

## C#

 `// C# program to count number of``// elements greater than mean``using` `System;` `class` `GFG {``    ` `    ``static` `int` `n = 4, m = 5;``    ` `    ``// function to count elements``    ``// greater than mean``    ``static` `int` `countElements(``int` `[,]mat)``    ``{``        ``// For each row find minimum``        ``// element and add to rowSum``        ``int` `rowSum = 0;``        ``for` `(``int` `i = 0; i < n; i++)``        ``{``            ``int` `min = mat[i,0];``        ` `            ``for` `(``int` `j = 1; j < m; j++)``                ``if` `(mat[i,j] < min)``                    ``min = mat[i,j];``            ` `            ``rowSum += min;``        ``}``        ` `        ``// For each column find maximum``        ``// element and add to colSum``        ``int` `colSum = 0;``        ``for` `(``int` `i = 0; i < m; i++) {``            ``int` `max = mat[0,i];``        ` `            ``for` `(``int` `j = 1; j < n; j++)``                ``if` `(max < mat[j,i])``                    ``max = mat[j,i];``        ` `            ``colSum += max;``        ``}``    ` `        ``// Calculate mean of row-wise minimum``        ``// and column wise maximum``        ``int` `mean = (rowSum + colSum) / (m + n);``        ` `        ``// For whole matrix count``        ``// elements greater than mean``        ``int` `count = 0;``        ``for` `(``int` `i = 0; i < n; i++)``            ``for` `(``int` `j = 0; j < m; j++)``        ` `                ``if` `(mean < mat[i,j])``                    ``count++;``        ` `        ``return` `count;``    ``}``    ` `    ``// Driver function``    ``public` `static` `void` `Main()``    ``{``        ``int` `[,]mat = {{5, 4, 2, 8, 7},``                      ``{1, 5, 8, 3, 4},``                      ``{8, 5, 4, 6, 0},``                      ``{2, 5, 8, 9, 4}};``    ``Console.Write(countElements(mat));``    ``}``}` `// This article is contribute by nitin mittal.`

## PHP

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## Javascript

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Output:

`11`

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