添加0203.移除链表元素 Swift版本

Author: 余杜林

problems/0203.移除链表元素.md

@@ -304,6 +304,34 @@ var removeElements = function(head, val) {
 };
 ```
 
+Swift:
+
+```swift
+/**
+ * Definition for singly-linked list.
+ * public class ListNode {
+ *     public var val: Int
+ *     public var next: ListNode?
+ *     public init() { self.val = 0; self.next = nil; }
+ *     public init(_ val: Int) { self.val = val; self.next = nil; }
+ *     public init(_ val: Int, _ next: ListNode?) { self.val = val; self.next = next; }
+ * }
+ */
+func removeElements(_ head: ListNode?, _ val: Int) -> ListNode? {
+    let dummyNode = ListNode()
+    dummyNode.next = head
+    var currentNode = dummyNode
+    while let curNext = currentNode.next {
+        if curNext.val == val {
+            currentNode.next = curNext.next
+        } else {
+            currentNode = curNext
+        }
+    }
+    return dummyNode.next
+}
+```
+