Leetcode day1

leetcode/lc2/addNmrs.cpp

@@ -0,0 +1,27 @@
+class Solution{
+    public: 
+        ListNode* addTwoNumbers(ListNode* l1, ListNode* l2){
+            ListNode* dummyhead = new ListNode(0);
+            ListNode* tail = dummyhead;
+            bool carry = 0;
+
+            while(l1 || l2|| carry){
+                int digit1 = (l1!=nullptr) ? l1->val : 0;
+                int digit2 = (l2!=nullptr) ? l2->val : 0;
+
+                int sum = digit1+digit2+carry;
+                int digit = sum%10;
+                carry = sum/10;
+
+                ListNode* newnode = new ListNode*(digit);
+                tail->next = newnode;
+                tail = tail->next;
+
+                l1 = (l1!=nullptr) ? l1=>next : nullptr;
+                l2 = (l2!=nullptr) ? l2->next : nullptr;
+            }
+            ListNode* result = dummyhead->next;
+            delete dummyhead;
+            return result;
+        }
+}