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添加 0017.电话号码的字母组合.md Scala版本
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@ -557,6 +557,37 @@ func letterCombinations(_ digits: String) -> [String] {
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}
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}
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```
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```
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## Scala:
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```scala
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object Solution {
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import scala.collection.mutable
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def letterCombinations(digits: String): List[String] = {
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var result = mutable.ListBuffer[String]()
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if(digits == "") return result.toList // 如果参数为空,返回空结果集的List形式
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var path = mutable.ListBuffer[Char]()
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// 数字和字符的映射关系
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val map = Array[String]("", "", "abc", "def", "ghi", "jkl", "mno", "pqrs", "tuv", "wxyz")
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def backtracking(index: Int): Unit = {
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if (index == digits.size) {
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result.append(path.mkString) // mkString语法:将数组类型直接转换为字符串
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return
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}
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var digit = digits(index) - '0' // 这里使用toInt会报错!必须 -'0'
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for (i <- 0 until map(digit).size) {
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path.append(map(digit)(i))
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backtracking(index + 1)
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path = path.take(path.size - 1)
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}
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}
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backtracking(0)
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result.toList
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}
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}
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```
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-----------------------
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-----------------------
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<div align="center"><img src=https://code-thinking.cdn.bcebos.com/pics/01二维码一.jpg width=500> </img></div>
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<div align="center"><img src=https://code-thinking.cdn.bcebos.com/pics/01二维码一.jpg width=500> </img></div>
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