leetcode-2-两数相加

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简介：leetcode-2-两数相加

题目

https://leetcode.cn/problems/add-two-numbers/

题解

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# Definition for singly-linked list.
# class ListNode:
#     def __init__(self, val=0, next=None):
#         self.val = val
#         self.next = next
class Solution:
    def addTwoNumbers(self, l1: Optional[ListNode], l2: Optional[ListNode]) -> Optional[ListNode]:
        l3 = ListNode()
        p = l3

        need_add = 0
        num = l1.val+l2.val
        p.val = num%10 + need_add
        need_add = num//10
        
        l1 = l1.next
        l2 = l2.next

        while l1 != None and l2 != None:
            num = l1.val+l2.val + need_add
            p.next = ListNode(num%10)
            p = p.next
            need_add = num//10

            l1 = l1.next
            l2 = l2.next

        while l1 != None:
            num = l1.val + need_add
            p.next = ListNode(num%10)
            p = p.next
            need_add = num//10

            l1 = l1.next

        while l2 != None:
            num = l2.val + need_add
            p.next = ListNode(num%10)
            p = p.next
            need_add = num//10

            l2 = l2.next

        if need_add>0:
            p.next = ListNode(need_add)

        return l3