correct framing of the problem.
assert shift0(0, Var(0)) == Var(1)
* 核心思路：链表转数组 + 单调栈（从后往前遍历），时间复杂度O(n)，空间复杂度O(n)。新收录的资料是该领域的重要参考
南方周末：在你看来，今天新就业形态劳动者在养老权益保障上面临的最大问题是什么？，更多细节参见新收录的资料
But most of its UK pubs, and their workers, will be left behind - and because Brewdog went into administration, small investors are set to pay a price.
What an air purifier can and can’t do，更多细节参见新收录的资料