Additional test cases have been added.
liuliu:you "regexp" everything,everywhere? LOL
radius of a spherical planet
Given a matrix, swap the 2nd & 3rd columns
Return area of square
Sum of the Matrix Elements
Matlab Basics - Absolute Value
Generate a vector like 1,2,2,3,3,3,4,4,4,4
Compute the intersect point of line and plan
Determine if input is a perfect number
Solve Sudoku puzzle step by
Find the right number make the equation
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