Convert a given number to its Roman representation.
For example, if the number is 98, it should display 'XCVIII'
copy of Problem 63.
Prime factor digits
Flag largest magnitude swings as they occur
Given a 4x4 matrix, swap the two middle columns
find radius of cone
Swap two numbers
Find the area of the four walls
Create the following sequence : 0 1 1 4 9 25 64 169 ...
Reverse a matrix
Concatenate two strings
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