From 969c5c50ea5e73468cacc71bda0ef2894dda8c9b Mon Sep 17 00:00:00 2001
From: YDLIN <1924723909@qq.com>
Date: Mon, 30 Aug 2021 13:17:34 +0800
Subject: [PATCH] =?UTF-8?q?=E6=B7=BB=E5=8A=A0=E5=89=91=E6=8C=87Offer58-II.?=
 =?UTF-8?q?=E5=B7=A6=E6=97=8B=E8=BD=AC=E5=AD=97=E7=AC=A6=E4=B8=B2=20Swift?=
 =?UTF-8?q?=E7=89=88=E6=9C=AC?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 problems/剑指Offer58-II.左旋转字符串.md | 28 +++++++++++++++++++++++++
 1 file changed, 28 insertions(+)

diff --git a/problems/剑指Offer58-II.左旋转字符串.md b/problems/剑指Offer58-II.左旋转字符串.md
index f4d3368c..d8aaca67 100644
--- a/problems/剑指Offer58-II.左旋转字符串.md
+++ b/problems/剑指Offer58-II.左旋转字符串.md
@@ -214,6 +214,34 @@ var reverseLeftWords = function (s, n) {
 };
 ```
 
+Swift:
+
+```swift
+func reverseLeftWords(_ s: String, _ n: Int) -> String {
+    var ch = Array(s)
+    let len = ch.count
+    // 反转区间[0, n - 1]
+    reverseString(&ch, startIndex: 0, endIndex: n - 1)
+    // 反转区间[n, len - 1]
+    reverseString(&ch, startIndex: n, endIndex: len - 1)
+    // 反转区间[0, len - 1]，也就是整个字符串反转
+    reverseString(&ch, startIndex: 0, endIndex: len - 1)
+    return String(ch)
+}
+
+func reverseString(_ s: inout [Character], startIndex: Int, endIndex: Int)  {
+    var start = startIndex
+    var end = endIndex
+    while start < end {
+        (s[start], s[end]) = (s[end], s[start])
+        start += 1
+        end -= 1
+    }
+}
+```
+
+
+