Given two input arrays like this:
Output a string that contains each letter the specified number of times, e.g.:
If given an invalid input (for example, a negative number), output the string 'ERROR'.
Now with improved tests, and reference solution (which I'm sure you can beat).
Back and Forth Rows
Find the numeric mean of the prime numbers in a matrix.
Knight's Tour Checker
03 - Matrix Variables 3
"Look and say" sequence
Create a recurrence matrix for a vector of data
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