# Count all the columns in a matrix which are sorted in descending

Given a matrix mat[][], the task is to count the number of columns that are sorted in descending.

Examples:

Input: mat[][] = {{1, 3}, {0, 2}}
Output: 2
First column: 1 > 0
Second column: 3 > 2
Hence, the count is 2

Input: mat[][] = {{2, 2}, {1, 3}}
Output: 1

## Recommended: Please try your approach on {IDE} first, before moving on to the solution.

Approach: Traverse each column one by one and check if the next elementprevious element in the same column. If the condition is valid for all the possible elements then increment the count by 1. After all the columns have been traversed, print the count.

Below is the implementation of the above approach:

## Python3

 `# Python3 program to count the number of columns  ` `# in a matrix that are sorted in descending ` ` `  `# Function to count the number of columns  ` `# in a matrix that are sorted in descending ` `def` `countDescCol(A):  ` `   `  `    ``countOfCol ``=` `0` `   `  `    ``for` `col ``in` `zip``(``*``A):  ` `        ``if` `all``(col[i] >``=` `col[i ``+` `1``] ``for` `i ``in` `range``(``len``(col) ``-` `1``)):  ` `            ``countOfCol ``+``=` `1` `   `  `    ``return` `countOfCol  ` `   `  `# Driver code  ` `A ``=` `[[``1``, ``3``], [``0``, ``2``]]  ` `print``(countDescCol(A))  `

Output:

```2
```

My Personal Notes arrow_drop_up

Check out this Author's contributed articles.

If you like GeeksforGeeks and would like to contribute, you can also write an article using contribute.geeksforgeeks.org or mail your article to contribute@geeksforgeeks.org. See your article appearing on the GeeksforGeeks main page and help other Geeks.

Please Improve this article if you find anything incorrect by clicking on the "Improve Article" button below.

Article Tags :
Practice Tags :

Be the First to upvote.

Please write to us at contribute@geeksforgeeks.org to report any issue with the above content.