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

Binary searching in a std::multiset can be a bit tricky since a multiset allows duplicate values. However, you can still implement a search to find the first occurrence of a value or to check the presence of a value efficiently using its iterators.

Below is an example demonstrating how to perform a binary search in a std::multiset:

#include #include int main() { std::multiset mset = {1, 2, 3, 4, 4, 5, 6}; int value_to_find = 4; auto it = mset.lower_bound(value_to_find); // Get an iterator to the first occurrence if (it != mset.end() && *it == value_to_find) { std::cout << value_to_find << " found in multiset." << std::endl; } else { std::cout << value_to_find << " not found in multiset." << std::endl; } return 0; }

C++ std::multiset binary search algorithms

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