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).
Program an exclusive OR operation with logical operators
Find number of days
Add two numbers
Create a recurrence matrix for a vector of data
"Look and say" sequence
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