练习题3:两数相加
"""
例1:
输入: l1 = [2,4,3], l2 = [5,6,4]
输出: [7,0,8]
解释: 342 + 465 = 807.
示例 2
输入: l1 = [0], l2 = [0]
输出: [0]
示例 3:
输入: l1 = [9,9,9,9,9,9,9], l2 = [9,9,9,9]
输出: [8,9,9,9,0,0,0,1]
思路:
进行列表倒序, 并拼接列表内的元素,
"""

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