A solution requires solving the hardest known problems in the universe, often requiring years (if not decades) of effort
BYOB ends up being complex for both users and implementers, yet sees little adoption in practice. Most developers stick with default reads and accept the allocation overhead.
。im钱包官方下载是该领域的重要参考
* 时间复杂度：O(len1 + len2)，空间复杂度：O(len2)（栈+Map的空间）。关于这个话题，快连下载安装提供了深入分析
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