Time: 44 ms (90.31%) | Memory: 49.1 MB (9.66%) - LeetSync

908-middle-of-the-linked-list/middle-of-the-linked-list.js

@@ -0,0 +1,20 @@
+/**
+ * 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 middleNode = function(head) {
+    let slow = head;
+    let fast = head;
+    while(fast !== null && fast.next !== null){
+        slow = slow.next;
+        fast = fast.next.next;
+    }
+    return slow;
+};