From 78b367e5c5ee493a96cfe4ebcb440059909db285 Mon Sep 17 00:00:00 2001
From: ZongqinWang <1722249371@qq.com>
Date: Sun, 15 May 2022 12:57:39 +0800
Subject: [PATCH] =?UTF-8?q?=E6=B7=BB=E5=8A=A0=200151.=E7=BF=BB=E8=BD=AC?=
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 =?UTF-8?q?.md=20Scala=E7=89=88=E6=9C=AC?=
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---
 problems/0151.翻转字符串里的单词.md | 56 ++++++++++++++++++++
 1 file changed, 56 insertions(+)

diff --git a/problems/0151.翻转字符串里的单词.md b/problems/0151.翻转字符串里的单词.md
index d03de421..0e25fc4d 100644
--- a/problems/0151.翻转字符串里的单词.md
+++ b/problems/0151.翻转字符串里的单词.md
@@ -758,7 +758,63 @@ func reverseWord(_ s: inout [Character]) {
 }
 ```
 
+Scala:
 
+```scala
+object Solution {
+  def reverseWords(s: String): String = {
+    var sb = removeSpace(s) // 移除多余的空格
+    reverseString(sb, 0, sb.length - 1) // 翻转字符串
+    reverseEachWord(sb)
+    sb.mkString
+  }
+
+  // 移除多余的空格
+  def removeSpace(s: String): Array[Char] = {
+    var start = 0
+    var end = s.length - 1
+    // 移除字符串前面的空格
+    while (start < s.length && s(start) == ' ') start += 1
+    // 移除字符串后面的空格
+    while (end >= 0 && s(end) == ' ') end -= 1
+    var sb = "" // String
+    // 当start小于等于end的时候，执行添加操作
+    while (start <= end) {
+      var c = s(start)
+      // 当前字符不等于空，sb的最后一个字符不等于空的时候添加到sb
+      if (c != ' ' || sb(sb.length - 1) != ' ') {
+        sb ++= c.toString
+      }
+      start += 1 // 指针向右移动
+    }
+    sb.toArray
+  }
+
+  // 翻转字符串
+  def reverseString(s: Array[Char], start: Int, end: Int): Unit = {
+    var (left, right) = (start, end)
+    while (left < right) {
+      var tmp = s(left)
+      s(left) = s(right)
+      s(right) = tmp
+      left += 1
+      right -= 1
+    }
+  }
+
+  // 翻转每个单词
+  def reverseEachWord(s: Array[Char]): Unit = {
+    var i = 0
+    while (i < s.length) {
+      var j = i + 1
+      // 向后迭代寻找每个单词的坐标
+      while (j < s.length && s(j) != ' ') j += 1
+      reverseString(s, i, j - 1)  // 翻转每个单词
+      i = j + 1   // i往后更新
+    }
+  }
+}
+```