This is done to provide a quick lookup operation for any key value. This means that the order in which you insert the elements in a map does not matter, as the map internally stores all elements in sorted order. In the above example, we did not have to go through the whole array to find the student with the name "Antarctica" or "Europe", we just required the key which in this case was the name of the student and the value associated to that key was retrieved quickly, to be accurate the time complexity of the worst case if we had to iterate through the whole array would have been O ( N ∗ L ) N is the number of elements Does Order Matter in Maps in C++?Ī map in C++ keeps the key-value pairs in sorted order, to be precise, in increasing order of the key values. Just like each book is unique and points to a specific shelf in the library. This means that each key is unique and points to a specific value. Maps are container structures that store key-value pairs. Each book is assigned a shelf number, which is stored in the computer system, for easy and fast lookup. Usually, library management systems make use of something similar to maps to search efficiently where a book must be kept. Have you ever wondered how the mechanism of storing books in a library works? This article shows the implementation and syntax of maps in C++.This article also focuses on the STL map in C++, including all the member functions provided in the library as well as their uses.This article explores the container data structures map in C++.Maps in C++ store the key-value pairs in sorted order by default so that the search for any key-value pair can be very quick. This is why every key has to be unique, and no two keys can be the same(but the values associated to keys can be the same). This means that for every unique key, there is a data value mapped to it, that can be easily accessed if we know the key. Maps in C++ are container structures that store elements in key-value pairs.
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