Add two Numbers LL code added

leetcode/AddTwoNumbers.cpp

@@ -0,0 +1,34 @@
+// Leetcode Problem No-2 : Add Two Numbers
+// https://leetcode.com/problems/add-two-numbers/
+
+/**
+ * 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 *addTwoNumbers(ListNode *l1, ListNode *l2)
+    {
+        ListNode *result_ans = new ListNode(0);
+        ListNode *head = result_ans;
+        int carry = 0;
+        while (l1 != NULL || l2 != NULL || carry > 0)
+        {
+            int result = carry + (l1 != NULL ? l1->val : 0) + (l2 != NULL ? l2->val : 0);
+            ListNode *new_result = new ListNode(result % 10);
+            carry = result / 10;
+            l1 = (l1 == NULL ? l1 : l1->next);
+            l2 = (l2 == NULL ? l2 : l2->next);
+            result_ans->next = new_result;
+            result_ans = result_ans->next;
+        }
+        return head->next;
+    }
+};