狗家最近高频面筋整理

之前面试准备的一些面筋跟大家分享一下，求加加米
（因为自己米太少也看不了就不设置限制了）

Hashtables:
Arguably the single most important data structure known to mankind. You should know how they work. Be able to implement one using only arrays in your favorite language, in about the space of one interview.

Trees:
Know about trees, basic tree construction, traversal and manipulation algorithms.   
Familiarize yourself with binary trees, n-ary trees, and trie-trees.
Be familiar w

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真的会让手撸红黑表吗？！

我想问问leet code 网的高频有用嘛？