CodingBat array_7rowOrSandwich

array_7rowOrSandwich

Given an integer array "a", return the number of times that two sevens appear in a row plus the number of seven sandwiches. An example of "two sevens in-a-row" would be {2,7,7,4}. An an example of a "seven sandwich" would be {1,7,2,7}.

array_7rowOrSandwich([1, 2, 3, 7, 7]) → 1
array_7rowOrSandwich([3, 7, 2, 7, 7]) → 2
array_7rowOrSandwich([7, 2, 0, 8, 7]) → 0

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