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).
Swap the first and last columns
Filter AC, pass DC
Determine if a Given Number is a Triangle Number
Sum the Digits of a Number
Try 1.5.4: Celsius to Fahrenheit
"Look and say" sequence
Create a recurrence matrix for a vector of data
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