add 0206翻转链表-golang

problems/0206.翻转链表.md

@@ -147,6 +147,35 @@ Python：
 
 Go：
 
+```go
+//双指针
+func reverseList(head *ListNode) *ListNode {
+    var pre *ListNode
+    cur := head
+    for cur != nil {
+        next := cur.Next
+        cur.Next = pre
+        pre = cur
+        cur = next
+    }
+    return pre
+}
+
+//递归
+func reverseList(head *ListNode) *ListNode {
+    return help(nil, head)
+}
+
+func help(pre, head *ListNode)*ListNode{
+    if head == nil {
+        return pre
+    }
+    next := head.Next
+    head.Next = pre
+    return help(head, next)
+}
+
+```
 javaScript: 
 
 ```js