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.
Find relatively common elements in matrix rows
Narcissistic number ?
Rounding off numbers to n decimals
Area of a triangle
Summation of array
Convert a number to its Roman representation
Create the following sequence : 0 1 1 4 9 25 64 169 ...
Concatenate two strings
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