Given a pathname string, return a condensed version by replacing intermediate folders with '..'.
fullpath = 'C:\foo\bar\baz\qux';
shortpath = 'C:\..\qux';
Additional test cases have been added.
Distance walked 2D
Solve the set of simultaneous linear equations
Convert from Base 10 to base 5
Add two numbers
Find the nearest prime number
Check if vertices form a rectangle
Extra safe primes
Assign matrix elements to separate variables
Cumulative maximum of an array
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