Web Reference: Apr 26, 2025 · std::map is a sorted associative container that contains key-value pairs with unique keys. Keys are sorted by using the comparison function Compare. Search, removal, and insertion operations have logarithmic complexity. Maps are usually implemented as Red–black trees. Jan 17, 2026 · Maps are associative containers that store key–value pairs in sorted order using a self-balancing Red-Black Tree. They ensure O (log n) time for search, insertion, and deletion, do not allow duplicate keys, and provide ordered traversal along with functions like upper_bound () and lower_bound (). std::set and std::multiset are declared in header , while std::map and std::multimap are declared in header . The associative containers are similar to the unordered associative containers in C++ standard library, the only difference is that the unordered associative containers, as their name implies, do not order their elements.
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