Given two input arrays like this: [5,3,1] ['a','b','c']
Output a string that contains each letter the specified number of times, e.g.:
'aaaaabbbc'
If given an invalid input (for example, a negative number), output the string 'ERROR'.
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Problem Comments
Alex Feinman
on 8 Feb 2012
Now with improved tests, and reference solution (which I'm sure you can beat).
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