Merge pull request #918 from qxuewei/master

添加 1047. 删除字符串中的所有相邻重复项 Swift版本

problems/1047.删除字符串中的所有相邻重复项.md

@@ -319,6 +319,22 @@ char * removeDuplicates(char * s){
 }
 ```
 
+Swift：
+```swift
+func removeDuplicates(_ s: String) -> String {
+    let array = Array(s)
+    var stack = [Character]()
+    for c in array {
+        let last: Character? = stack.last
+        if stack.isEmpty || last != c {
+            stack.append(c)
+        } else {
+            stack.removeLast()
+        }
+    }
+    return String(stack)
+}
+```
 
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