Commit 9f889bc

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+This problem was recently asked by Microsoft:
+
+You are given two linked-lists representing two non-negative integers.
+The digits are stored in reverse order and each of their nodes contain a single digit.
+Add the two numbers and return it as a linked list.
+
+```plaintext
+Example:
+
+Input: (2 -> 4 -> 3) + (5 -> 6 -> 4)
+Output: 7 -> 0 -> 8
+Explanation: 342 + 465 = 807.
+```
+
+Here is the function signature as a starting point (in Python):
+
+```python
+# Definition for singly-linked list.
+class ListNode(object):
+  def __init__(self, x):
+    self.val = x
+    self.next = None
+
+class Solution:
+  def addTwoNumbers(self, l1, l2, c = 0):
+    # Fill this in.
+
+l1 = ListNode(2)
+l1.next = ListNode(4)
+l1.next.next = ListNode(3)
+
+l2 = ListNode(5)
+l2.next = ListNode(6)
+l2.next.next = ListNode(4)
+
+result = Solution().addTwoNumbers(l1, l2)
+while result:
+  print result.val,
+  result = result.next
+# 7 0 8
+```