Problem asks for palindromes starting at 1, but test cases start at 100.
Now it goes down to 10, but wouldn't single digits be considered palindromes as well?
Additional test cases were added and the description slightly enhanced.
Which doors are open?
Reverse a matrix
Remove the positive integers.
Matlab Basics II - Minimum
Find the area of the four walls
Find the dimensions of a matrix
Concatenate two strings
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