# Demo entry 6788994

Python

Submitted by anonymous on Apr 24, 2019 at 14:16
Language: Python 3. Code size: 1.6 kB.

```class Solution:
def addTwoNumbers(self, l1: ListNode, l2: ListNode) -> ListNode:
res = ListNode(0)
c = res
carry = 0
while(l1 and l2):
c.next = ListNode(0)
c = c.next
c.val = (l1.val + l2.val + carry) % 10
carry = (l1.val + l2.val + carry) // 10
l1 = l1.next
l2 = l2.next
if l1 == None:
t = l2
else:
t = l1
if carry > 0:
while t:
c.next = ListNode(0)
c = c.next
c.val = (t.val + carry) % 10
carry = (t.val + carry) // 10
t = t.next
if carry > 0:
c.next = ListNode(0)
c = c.next
c.val = carry
else:
c.next = t
return res.next

class Solution:
def addTwoNumbers(self, l1: ListNode, l2: ListNode) -> ListNode:
sum = ListNode(0)
head = sum
carry = 0

while True:
if l1 != None:
sum.val += l1.val
l1 = l1.next

if l2 != None:
sum.val += l2.val
l2 = l2.next

sum.val += carry
carry = int(sum.val / 10)
sum.val %= 10

if l1 != None or l2 != None or carry > 0:
sum.next = ListNode(0)
sum = sum.next
else:
break

return head
```

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