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Read [here](https://stackoverflow.com/questions/1452721/why-is-using-namespace-std-considered-bad-practice) why you `using namespace std;` is considered bad practise.

Please provide a [minimal, reproducible example](https://stackoverflow.com/help/minimal-reproducible-example).

[Here is a list of good books](https://stackoverflow.com/questions/388242/the-definitive-c-book-guide-and-list/388282#388282) to learn the basics.