Create 24.两两交换链表中的节点.js

Author: yinxin630

24.两两交换链表中的节点.js

@@ -0,0 +1,36 @@
+/**
+ * Definition for singly-linked list.
+ * function ListNode(val) {
+ *     this.val = val;
+ *     this.next = null;
+ * }
+ */
+/**
+ * @param {ListNode} head
+ * @return {ListNode}
+ */
+var swapPairs = function(head) {
+    if (!head.next) {
+        return head;
+    }
+
+    const v = new ListNode();
+    v.next = head;
+    let cur = v;
+
+    while (cur) {
+        const a = cur.next;
+        const b = a && a.next;
+
+        if (b) {
+            a.next = b.next;
+            b.next = a;
+            cur.next = b;
+            cur = a;
+        } else {
+            break;
+        }
+    }
+
+    return v.next;
+};