Problem 288. Construct a string from letters and counts

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'.

Solve

Last solution submitted on Apr 02, 2019

Alex Feinman on 8 Feb 2012

Now with improved tests, and reference solution (which I'm sure you can beat).

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