Create add-two-numbers.py

Adds two objects in reverse sorted singly linked lists together

add-two-numbers.py

@@ -0,0 +1,37 @@
+# Definition for singly-linked list.
+# class ListNode(object):
+#     def __init__(self, val=0, next=None):
+#         self.val = val
+#         self.next = next
+class Solution(object):
+    def addTwoNumbers(self, l1, l2):
+        """
+        :type l1: ListNode
+        :type l2: ListNode
+        :rtype: ListNode
+        """
+        lFinal = ListNode()
+        temp = lFinal
+        while l1 != None or l2 != None:
+            if l1 != None:
+                self.chainAdd(temp, l1.val)
+                l1 = l1.next
+            if l2 != None:
+                self.chainAdd(temp, l2.val)
+                l2 = l2.next
+            if temp.next == None and (l1 != None or l2 != None):
+                temp.next = ListNode()
+            temp = temp.next
+        return lFinal
+
+
+    def chainAdd(self, lis, num):
+        if lis.val + num > 9:
+            if lis.next != None:
+                lis.val = lis.val + num - 10
+                self.chainAdd(lis.next, 1)
+            else:
+                lis.val = lis.val + num - 10
+                lis.next = ListNode(val = 1)
+        else:
+            lis.val = lis.val + num