Software Engineer Trainee

You are given an N x M integer matrix. Your task is to modify this matrix in place so that if any cell contains the value 0, then all cells in the same row and column as that cell should also be set to 0.

Requirements:

• If a cell in the matrix has the value 0, set all other cells in that cell's row and column to 0.
• You should perform this modification in place (without using additional matrices).

You must do it in place.

For Example:

If the given grid is this:
[7, 19, 3]
[4, 21, 0]

Then the modified grid will be:
[7, 19, 0]
[0, 0,  0]

You have been given a long type array/list 'arr’ of size 'n’.

It represents an elevation map wherein 'arr[i]’ denotes the elevation of the 'ith' bar.

Print the total amount of rainwater that can be trapped in these elevations.

Note :

The width of each bar is the same and is equal to 1.

Example:

Input: ‘n’ = 6, ‘arr’ = [3, 0, 0, 2, 0, 4].

Output: 10

Explanation: Refer to the image for better comprehension:

Note :

You don't need to print anything. It has already been taken care of. Just implement the given function.

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