* Update summary.md
@Richard-Zhao93 的回答非常好,同时觉得"如果在开头能了解到这部分s,对初学者来说,可能更容易接受这些陌生的概念。"的建议很有道理
* Update QA of time_complexity
* Enhance explanation of hash tables vs arrays
Clarify the advantages of hash tables over arrays for key-value mapping.
* Update summary.md
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Co-authored-by: Yudong Jin <krahets@163.com>
* Sync recent changes to the revised Word.
* Revised the preface chapter
* Revised the introduction chapter
* Revised the computation complexity chapter
* Revised the chapter data structure
* Revised the chapter array and linked list
* Revised the chapter stack and queue
* Revised the chapter hashing
* Revised the chapter tree
* Revised the chapter heap
* Revised the chapter graph
* Revised the chapter searching
* Reivised the sorting chapter
* Revised the divide and conquer chapter
* Revised the chapter backtacking
* Revised the DP chapter
* Revised the greedy chapter
* Revised the appendix chapter
* Revised the preface chapter doubly
* Revised the figures