Convert a given number to its Roman representation.
For example, if the number is 98, it should display 'XCVIII'
copy of Problem 63.
Who Has the Most Change?
Given a 4x4 matrix, swap the two middle columns
find the maximum element of the matrix
Find the hypotenuse
Perfect Square or not
Concatenate two strings
Find the area of the four walls
Reverse a matrix
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