题解 | #两个链表生成相加链表#

# class ListNode:
#     def __init__(self, x):
#         self.val = x
#         self.next = None
#
# 代码中的类名、方法名、参数名已经指定，请勿修改，直接返回方法规定的值即可
#
# 
# @param head1 ListNode类 
# @param head2 ListNode类 
# @return ListNode类
#
class Solution:
    def addInList(self , head1: ListNode, head2: ListNode) -> ListNode:
        # write code here
        ll1 = ''
        while head1:
            ll1 += str(head1.val)
            head1 = head1.next
        ll2 = ''
        while head2:
            ll2 += str(head2.val)
            head2 = head2.next
        
        var = list(str(int(ll1) + int (ll2)))
        var.reverse()
        
        # 生成链表
        ret = head = ListNode(int(var.pop()))
        while var:
            next = ListNode(int(var.pop()))
            head.next = next
            head = next
        return ret