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added overview of lists vs trees vs graphs
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NehaKeshan
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- Implementation of ds_set class using binary search trees
- In-order, pre-order, and post-order traversal
## Overview: Lists vs Trees vs Graphs
- Trees create a hierarchical organization of data, rather than the linear organization in linked lists (and arrays and vectors).
- Binary search trees are the mechanism underlying maps & sets (and multimaps & multisets).
- Mathematically speaking: A _graph_ is a set of vertices connected by edges. And a tree is a special graph that has no _cycles_. The edges that connect nodes in trees and graphs may be _directed_ or _undirected_.
## 17.1 Definition: Binary Trees
- A binary tree (strictly speaking, a “rooted binary