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Which header file is required to use pair container in your program?

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Which header file is required to use pair container in your program?

(a) <algorihtm>

(b) <utility>

(c) <pair>

(d) <utitityPair>

I had been asked this question in semester exam.

The above asked question is from STL in chapter Class Hierarchies, Library & Containers of C++

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The correct option is (b) <utility>

Easy explanation - Pair container is defined under the header file <utility> therefore one should include  header before using pair container.

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