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leetcode-2-add-two-numbers.py
64 lines (58 loc) · 1.36 KB
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leetcode-2-add-two-numbers.py
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#! /usr/bin/env python3
class ListNode(object):
def __init__(self, x):
self.val = x
self.next = None
class Solution(object):
def addTwoNumbers(self, l1, l2):
"""
:type l1: ListNode
:type l2: ListNode
:rtype: ListNode
"""
carry = False
answer = None
head = None
while l1 or l2:
if l1 and l2:
val = l1.val + l2.val
elif l1:
val = l1.val
else:
val = l2.val
if carry:
val += 1
if val >= 10:
carry = True
val = val % 10
else:
carry = False
l = ListNode(val)
if not answer:
answer = l
head = answer
else:
head.next = l
head = head.next
if l1:
l1 = l1.next
if l2:
l2 = l2.next
if carry:
l = ListNode(1)
head.next = l
head = head.next
return answer
if __name__ == '__main__':
l1 = None
l2 = None
for i in [1]:
l = ListNode(i)
l.next = l1
l1 = l
for i in [9,9]:
l = ListNode(i)
l.next = l2
l2 = l
s = Solution()
a = s.addTwoNumbers(l1, l2)