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Array-3 > maxSpan
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Consider the leftmost and righmost appearances of some value in an array. We'll say that the "span" is the number of elements between the two inclusive. A single value has a span of 1. Returns the largest span found in the given array. (Efficiency is not a priority.)
maxSpan([1, 2, 1, 1, 3]) → 4//why 4??
maxSpan([1, 4, 2, 1, 4, 1, 4]) → 6//why 6?
maxSpan([1, 4, 2, 1, 4, 4, 4]) → 6
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