How do I binary search with algorithms with std::multimap?

Binary searching in a `std::multimap` can be a task due to its unordered nature, but you can achieve effective searching using iterators. Below is an example demonstrating how to perform a binary search-like operation in a `std::multimap`.

#include <iostream> #include <map> int main() { // Create a multimap std::multimap mmap; mmap.insert(std::make_pair(1, "one")); mmap.insert(std::make_pair(2, "two")); mmap.insert(std::make_pair(2, "dos")); mmap.insert(std::make_pair(3, "three")); // The key to search for int key_to_search = 2; // Use equal_range to find all entries with the key auto range = mmap.equal_range(key_to_search); // Output the results std::cout << "Results for key " << key_to_search << ":" << std::endl; for (auto it = range.first; it != range.second; ++it) { std::cout << it->second << std::endl; } return 0; }

C++ std::multimap binary search algorithms

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