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 - Hash Tables, Hash Functions, and Collision Resolution <!--(leetcode 1, 705, 706)-->
 - Performance of: Hash Tables vs. Binary Search Trees
 - Collision resolution: separate chaining vs open addressing
- STL’s unordered_set (and unordered_map)
+- STL’s unordered_set and unordered_map
 - Using a hash table to implement a set/map
+
  – Hash functions as functors/function objects (leetcode 1451: Rearrange Words in a Sentence)
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  – Iterators, find, insert, and erase

 ## 20.1 Definition: What’s a Hash Table?