From which standard container is the map data structure implemented?

In the standard C++ library, the data structure std::map is implemented based on a red-black tree. This is a balanced binary search tree that provides logarithmic time complexity for insertion, deletion, and search operations.

In C++, std::map is an associative container that stores key-value pairs in sorted order by key. The red-black tree ensures tree balancing and operational efficiency.

Example of using std::map:

#include <iostream>
#include <map>

int main() {
    std::map<int, std::string> myMap;
    myMap[1] = "one";
    myMap[2] = "two";
    myMap[3] = "three";

    for (const auto& pair : myMap) {
        std::cout << pair.first << ": " << pair.second << std::endl;
    }
    return 0;
}

Thus, std::map is based on a balanced tree, not a hash table (for hash tables, std::unordered_map is used).