feat: 문제풀이 추가

Author: JEONGHWANMIN

merge-two-sorted-lists/hwanmini.js

@@ -0,0 +1,37 @@
+// 시간복잡도: O(m + n)
+// 공간복잡도: O(m + n)
+
+/**
+ * Definition for singly-linked list.
+ * function ListNode(val, next) {
+ *     this.val = (val===undefined ? 0 : val)
+ *     this.next = (next===undefined ? null : next)
+ * }
+ */
+/**
+ * @param {ListNode} list1
+ * @param {ListNode} list2
+ * @return {ListNode}
+ */
+var mergeTwoLists = function(list1, list2) {
+    let res = new ListNode()
+    let resCopy = res
+
+    while (list1 && list2) {
+        if (list1.val < list2.val) {
+            res.next = new ListNode(list1.val);
+            list1 = list1.next;
+        } else {
+            res.next = new ListNode(list2.val);
+            list2 = list2.next;
+        }
+
+        res = res.next
+    }
+
+    if (list1) res.next = list1;
+    if (list2) res.next = list2
+
+    return resCopy.next
+};
+