力扣题目之两数相加(纪念做出的第一道中等题）

题目描述如下

代码如下

# 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: ListNode, l2: ListNode) -> ListNode:
        a=''
        a1=l1
    
        while a1!=None:
            a=a+str(a1.val)
            a1=a1.next
        a=list(a)
        a.reverse()
        a=''.join(a)
        b1=l2
        b=''
        while b1!=None:
            b=b+str(b1.val)
            b1=b1.next
        b=list(b)
        b.reverse()
        b=''.join(b)
        c=int(a)+int(b)
        a3=ListNode(1)
        
        c=list(str(c))
        
        print(c)
        for i in range(len(c)):
            c[i]=int(c[i])
            if i==0:
                a3=ListNode(c[i])
            else:
                tmp=ListNode(c[i],a3)
                a3=tmp
        return a3