add-two-numbers.cs

Author: Shalaahuddien

2-add-two-numbers/2-add-two-numbers.cs

@@ -0,0 +1,34 @@
+/**
+ * Definition for singly-linked list.
+ * public class ListNode {
+ *     public int val;
+ *     public ListNode next;
+ *     public ListNode(int x) { val = x; }
+ * }
+ */
+public class Solution {
+    public ListNode AddTwoNumbers(ListNode l1, ListNode l2) {
+        ListNode dummy = new ListNode(0);
+        ListNode current = dummy;
+        int carry = 0;
+        
+        while (l1 != null || l2 != null || carry != 0) {
+            int sum = carry;
+            if (l1 != null) {
+                sum += l1.val;
+                l1 = l1.next;
+            }
+            if (l2 != null) {
+                sum += l2.val;
+                l2 = l2.next;
+            }
+            
+            carry = sum / 10;
+            sum = sum % 10;
+            current.next = new ListNode(sum);
+            current = current.next;
+        }
+        
+        return dummy.next;
+    }
+}