[jun0811] WEEK 04 Solutions

merge-two-sorted-lists/jun0811.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)
+ * }
+ */
+
+var mergeTwoLists = function (list1, list2) {
+  if (!list1) return list2;
+  else if (!list2) return list1;
+
+  if (list1.val <= list2.val) {
+    list1.next = mergeTwoLists(list1.next, list2);
+    return list1;
+  } else {
+    list2.next = mergeTwoLists(list1, list2.next);
+    return list2;
+  }
+};