我正在使用Rosetta Code的教程来计算Levenshtein距离.看起来他们的代码在Swift2中,所以我Binary operator '+' cannot be applied to operands of type '[Int]' and 'Repeated<String.CharacterView>'这样做时会出现这个错误:var cur = [i + 2] + emptywhere let empty = repeatElement(s, count: 0).我怎么能这样做？