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What is meant by hash tables in C++?

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What is meant by hash tables in C++?

(a) Array data structure

(b) Keyed array data structure

(c) Data structure

(d) Linear probing

This question was addressed to me in examination.

My doubt is from C Style Algorithms topic in portion Algorithms, Objects & Iterators in C++ of C++

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Right answer is (b) Keyed array data structure

The best I can explain: In hash table, every value will have a key, So that it can be accessed easily.

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