Problem 44467. Product of Each Column
Given a matrix mat with n columns, return a row vector v of length n, where every element in v is the product of the n-th column.
You cannot use MATLAB Prod() function
Example:
Input: mat = [ 1, 2, 3, 4; 5, 6, 7, 2; 2, 3, 4, 5] Output: v = [10, 36, 84, 40]
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