Questions¶
Difficulty: Medium
You are given two linked lists representing two non-negative numbers. The digits are stored in reverse order and each of their nodes contain a single digit. Add the two numbers and return it as a linked list.
Input: (2 -> 4 -> 3) + (5 -> 6 -> 4)
Output: 7 -> 0 -> 8
Coding¶
python¶
# -*- coding: utf-8 -*-
# Definition for singly-linked list.
# 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
"""
l = l1
ll = l2
flag = 0
temp = None
while l1 is not None and l2 is not None:
l1.val =l1.val + l2.val + flag
flag = l1.val / 10
l1.val %= 10
temp = l1
l1 = l1.next
l2 = l2.next
if l2 is not None:
temp.next = l2
l1 = l2
while l1 is not None:
l1.val += flag
flag = l1.val / 10
l1.val %= 10
temp = l1
l1 = l1.next
if flag == 1:
temp.next = ll
ll.val = 1
ll.next = None
return l