77

swolecoder · swolecoder · commit 66e48749b478 · 2020-12-24T09:25:59.000-05:00
diff --git a/Day77/index.js b/Day77/index.js
@@ -0,0 +1,31 @@
+/**
+ * Definition for singly-linked list.
+ * function ListNode(val, next) {
+ *     this.val = (val===undefined ? 0 : val)
+ *     this.next = (next===undefined ? null : next)
+ * }
+ */
+/**
+ * @param {ListNode} head
+ * @return {ListNode}
+ */
+var swapPairs = function (head) {
+
+    let dummy = new ListNode(-1);
+    dummy.next = head;
+    let res = dummy;
+
+    while (dummy.next && dummy.next.next) {
+        let p = dummy.next;
+        let q = dummy.next.next;
+
+        dummy.next = q;
+        p.next = q.next;
+        q.next = p;
+
+        dummy = p;
+
+    }
+
+    return res.next;
+};
diff --git a/README.md b/README.md
@@ -172,3 +172,6 @@ If you are loving solving problems in leetcode, please contact me to enjoy it to
 
 
 |Day 76| [556. Next Greater Element III](https://leetcode.com/problems/next-greater-element-iii/) | [javascript]()|[:memo:](https://leetcode.com/problems/next-greater-element-iii/)|Medium|
+
+
+|Day 77| [24. Swap Nodes in Pairs](https://leetcode.com/problems/swap-nodes-in-pairs/) | [javascript]()|[:memo:](https://leetcode.com/problems/swap-nodes-in-pairs/)|Medium|
