Create merge-2-lists.cpp

gabedonnan · Mar 29, 2023 · e2d07e9 · e2d07e9
1 parent 52d7d30
commit e2d07e9
Showing 1 changed file with 28 additions and 0 deletions.
diff --git a/merge-2-lists.cpp b/merge-2-lists.cpp
@@ -0,0 +1,28 @@
+/**
+ * Definition for singly-linked list.
+ * struct ListNode {
+ *     int val;
+ *     ListNode *next;
+ *     ListNode() : val(0), next(nullptr) {}
+ *     ListNode(int x) : val(x), next(nullptr) {}
+ *     ListNode(int x, ListNode *next) : val(x), next(next) {}
+ * };
+ */
+class Solution {
+public:
+    ListNode* mergeTwoLists(ListNode* list1, ListNode* list2) {
+        if (list1 == NULL) {
+            return list2;
+        } else if (list2 == NULL) {
+            return list1;
+        }
+
+        if (list1->val <= list2->val) {
+            list1->next = mergeTwoLists(list1->next, list2);
+            return list1;
+        } else {
+            list2->next = mergeTwoLists(list1, list2->next);
+            return list2;
+        }
+    }
+};