@@ -413,8 +413,62 @@ func replaceSpace(_ s: String) -> String {
413413}
414414```
415415
416+ Scala:
416417
417- 418+ 方式一: 双指针
419+ ``` scala
420+ object Solution {
421+ def replaceSpace (s : String ): String = {
422+ var count = 0
423+ s.foreach(c => if (c == ' ' ) count += 1 ) // 统计空格的数量
424+ val sOldSize = s.length // 旧数组字符串长度
425+ val sNewSize = s.length + count * 2 // 新数组字符串长度
426+ val res = new Array [Char ](sNewSize) // 新数组
427+ var index = sNewSize - 1 // 新数组索引
428+ // 逆序遍历
429+ for (i <- (0 until sOldSize).reverse) {
430+ if (s(i) == ' ' ) {
431+ res(index) = '0'
432+ index -= 1
433+ res(index) = '2'
434+ index -= 1
435+ res(index) = '%'
436+ } else {
437+ res(index) = s(i)
438+ }
439+ index -= 1
440+ }
441+ res.mkString
442+ }
443+ }
444+ ```
445+ 方式二: 使用一个集合,遇到空格就添加%20
446+ ``` scala
447+ object Solution {
448+ import scala .collection .mutable .ListBuffer
449+ def replaceSpace (s : String ): String = {
450+ val res : ListBuffer [Char ] = ListBuffer [Char ]()
451+ for (i <- s.indices) {
452+ if (s(i) == ' ' ) {
453+ res += '%'
454+ res += '2'
455+ res += '0'
456+ }else {
457+ res += s(i)
458+ }
459+ }
460+ res.mkString
461+ }
462+ }
463+ ```
464+ 方式三: 使用map
465+ ``` scala
466+ object Solution {
467+ def replaceSpace (s : String ): String = {
468+ s.map(c => if (c == ' ' ) " %20" else c).mkString
469+ }
470+ }
471+ ```
418472
419473
420474-----------------------
0 commit comments