Its simple. You have to reverse a given matrix.
The problem is really to just reverse a row vector. A row vector happens to be a matrix, but so does a column vector, and two or more dimensional matrices. Saying, "reverse a matrix" is ambiguous.
Return the largest number that is adjacent to a zero
Remove NaN ?
Back to basics 3 - Temp Directory
Vectorize the digits of an Integer
Reindex a vector
Convert a number to its Roman representation
Find the square of the sum of the digits of a number
Find the area of the four walls
Concatenate two strings
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