add 0024-golang

problems/0024.两两交换链表中的节点.md

@@ -131,6 +131,27 @@ class Solution {
 Python：
 
 Go：
+```go
+func swapPairs(head *ListNode) *ListNode {
+    dummy := &ListNode{
+        Next: head,
+    }
+    //head=list[i]
+    //pre=list[i-1]
+    pre := dummy 
+    for head != nil && head.Next != nil {
+        pre.Next = head.Next
+        next := head.Next.Next
+        head.Next.Next = head
+        head.Next = next
+        //pre=list[(i+2)-1]
+        pre = head 
+        //head=list[(i+2)]
+        head = next
+    }
+    return dummy.Next
+}
+```
 
 Javascript:
 ```javascript