자료형 변환
from typing import List
class ListNode:
def __init__(self, val=0, next=None):
self.val = val
self.next = next
class Solution:
def reverseList(self, head: ListNode) -> ListNode:
node, prev = head, None
while node:
next, node.next = node.next, prev
prev, node = node, next
return prev
def toList(self, node: List) -> List:
list: List = []
while node:
list.append(node.val)
node = node.next
return list
def toReversedLinkedList(self, result: str) -> ListNode:
prev: ListNode = None
for r in result:
node = ListNode(r)
node.next = prev
prev = node
return node
def addTwoNumbers(self, l1: ListNode, l2: ListNode) -> ListNode:
a = self.toList(self.reverseList(l1))
b = self.toList(self.reverseList(l2))
resultStr = int(''.join(str(e) for e in a)) + \
int(''.join(str(e) for e in b))
return self.toReversedLinkedList(str(resultStr))
전가산기 구현
from typing import List
class ListNode:
def __init__(self, val=0, next=None):
self.val = val
self.next = next
class Solution:
def addTwoNumbers(self, l1: ListNode, l2: ListNode) -> ListNode:
root = head = ListNode(0)
carry = 0
while l1 or l2 or carry:
sum = 0
if l1:
sum += l1.val
l1 = l1.next
if l2:
sum += l2.val
l2 = l2.next
carry, val = divmod(sum + carry, 10)
head.next = ListNode(val)
head = head.next
return root.next