我认为字符串哈希，最经典的是Rabin - Karp算法，它只是简单的相同概念，你有一个映射关系将你的输入映射成一组数字。
I think one of the classic ones for strings is called the Rabin-Karp algorithm. And it's simply the same idea that you have a mapping from your import into a set of integers.
深渊有一个简单的概念，而是考验你的策略和解决问题增加了难度，每个你进步的技能水平。
Abyss has a simple concept but tests your strategy and problem solving skills by increasing the difficulty of each level as you progress.
我有一个朋友对社会企业有一个很简单但是很棒的定义。他说：“社会企业就是运用商业概念来解决社会问题。”
One of my friend granted SE a simple and smart definition, which is "Social Enterprise is to solve social problems with business concepts".
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