@@ -659,6 +659,48 @@ func restoreIpAddresses(_ s: String) -> [String] {
659659}
660660```
661661
662+ ## Scala
663+ 664+ ``` scala
665+ object Solution {
666+ import scala .collection .mutable
667+ def restoreIpAddresses (s : String ): List [String ] = {
668+ var result = mutable.ListBuffer [String ]()
669+ if (s.size < 4 || s.length > 12 ) return result.toList
670+ var path = mutable.ListBuffer [String ]()
671+ 672+ // 判断IP中的一个字段是否为正确的
673+ def isIP (sub : String ): Boolean = {
674+ if (sub.size > 1 && sub(0 ) == '0' ) return false
675+ if (sub.toInt > 255 ) return false
676+ true
677+ }
678+ 679+ def backtracking (startIndex : Int ): Unit = {
680+ if (startIndex >= s.size) {
681+ if (path.size == 4 ) {
682+ result.append(path.mkString(" ." // mkString方法可以把集合里的数据以指定字符串拼接
683+ return
684+ }
685+ return
686+ }
687+ // subString
688+ for (i <- startIndex until startIndex + 3 if i < s.size) {
689+ var subString = s.substring(startIndex, i + 1 )
690+ if (isIP(subString)) { // 如果合法则进行下一轮
691+ path.append(subString)
692+ backtracking(i + 1 )
693+ path = path.take(path.size - 1 )
694+ }
695+ }
696+ }
697+ 698+ backtracking(0 )
699+ result.toList
700+ }
701+ }
702+ ```
703+ 662704
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664706<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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