Didn't really understand the problem right from reading the task itself, but from reading the test cases. Really fun problem though. First time I used regexprep function, so I learned a lot!
The problem asks to "add" a zero, no mention of append or prepend! Nice general solution though, and a new trick learned ($&0)
I feel I've overcomplicated my solution
regexprep(x, '(?(?=0[^0]|0$)0|)', '00')
I didn't know about $0! Nifty.
Neither did I! Matlab has great help.
The solution is not correct for the generalized case. 0$0 does a pre-pend of 0 not an append. The correct general solutions is either $00, or better to avoid operator ($0) confusion with the test set using 0s is operator ($%) $&0.
The solution is not correct for the generalized case. 0$0 does a pre-pend of 0 not an append. The correct general solutions is either $00, or better to avoid operator ($0) confusion with the test set using 0s is operator ($&) $&0. (Typo in prior comment)
Swap the first and last columns
Remove the air bubbles
Sophie Germain prime
sum of first 'n' terms
Mysterious digits operation (easy)
Find files with extension ext in the current directory
Sum of big primes without primes
Longest Collatz Sequence
Permute diagonal and antidiagonal
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