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Oct 30, 2023 · Map in C++ Standard Template Library (STL) Maps are associative containers that store elements in a mapped fashion. Each element has a key value and a mapped value. No two mapped values can have the same key values. std::map is the class template for map containers and it is defined inside the <map> header file.
- Traverse the Map
We can traverse map and unordered_map using 4 different ways...
- Map Find
The map::find () is a built-in function in C++ STL that...
- Implementing Multidimensional Map in C++
Multidimensional maps are nested maps; that is, they map a...
- How to Use HashMap in C++?
Pre-requisite: unordered_set, unordered_map C++ provides...
- Traverse the Map
- Initialization Using Assignment and Subscript Operator
- Initialization Using An initializer List
- Initialization Using An Array of Pairs
- Initialization from Another Map Using Map.Insert() Method
- Initialization from Another Map Using A Copy Constructor
- Initialization Through A Range
One of the simplest ways of initializing a map is to use the assignment(=) and the subscript() operators as shown below: Syntax: Here 1. is the subscript operator 2. = is the assignment operator Below is the C++ program to implement the above approach: Time complexity :O(NlogN) for insertion and O(N) for traversal, where N is the number of element...
Another way of initializing a map is to use a predefined list of key-value pairs. Syntax : Below is the C++ program to implement the above approach:
The map stores key-value pairs, one can store the key values using the array of pairs of the same type. Syntax: Here, old_arr is the array of pairs from which contents will be copied into the new_map. In the case of the vector of pairs, one can use the inbuilt iterators to copy contents from the vector of pairs Into the new map. Here, old_vector is...
A standard way of copying elements from a map to an existing old map in C++ is using the map.insertmember function. Syntax: Here, old_map is the map from which contents will be copied into the new_map. Below is the C++ program to implement the above approach:
One way to initialize a map is to copy contents from another map one after another by using the copy constructor. Syntax: Here, old_map is the map from which contents will be copied into the new_map. Below is the C++ program to implement the above approach:
Another way of initializing a map is to initialize it through a range of key-value pairs. Syntax: Here, instead of using another map, we store any range of key-value pairs. Below is the C++ program to implement the above approach:
Jan 29, 2018 · 587. 87K views 5 years ago C++ Programming Language Tutorials. Find Complete Code at GeeksforGeeks Article: https://www.geeksforgeeks.org/map-ass... This video is contributed by...
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