The checkpoint command can also be abbreviated as cp.
Author(s): Jiachen Xie, Jianteng Wang, Xudong Rong, Dongdong Zhao, Enzuo Liu, Chunnian He, Chunshen Shi, Naiqin Zhao。关于这个话题，同城约会提供了深入分析
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* 时间O(n) 空间O(n)（理论最优，无冗余计算/存储）