How To Find the Intersection of Two Multimaps in C++? Last Updated : 01 Mar, 2024 Summarize Comments Improve Suggest changes Share Like Article Like Report In C++, finding the intersection of two multimaps consists of identifying the common elements that are shared between both collections, containing key-value pairs. In this article, we will learn how to find the intersection of two multimaps in C++ STL. Example:Input:multimap1 = {1, "Java"}, {2, "Python"}, {3, "C++"}, {4, "JavaScript"}mutlimap2 = {2, "Python"}, {4, "JavaScript"}, {5, "TypeScript"}Output:Intersection:{2: Python}{4: JavaScript}Intersection of Two Multimaps With Common Values in C++To find the intersection between two multimaps in C++ STL, we have to iterate through each element using a loop in the first multimap and search for the corresponding elements in the second multimap. If the matching element is found then it is inserted into the result multimap. C++ Program to Find the Intersection of Two MultimapsThe below program demonstrates how we can find the intersection between two multimaps in C++. C++ // C++ Program to illustrate how to find the intersection of // two multimaps #include <iostream> #include <map> using namespace std; int main() { // Defining multimap1 multimap<int, string> multi1 = { { 1, "Java" }, { 2, "Python" }, { 3, "C++" }, { 4, "JavaScript" } }; // Defining multimap2 multimap<int, string> multi2 = { { 2, "Python" }, { 4, "JavaScript" }, { 5, "TypeScript" } }; // Finding Intersection between multimap1 and multimap2 multimap<int, string> res; for (const auto& pair : multi1) { auto range = multi2.equal_range(pair.first); for (auto it = range.first; it != range.second; ++it) { if (it->second == pair.second) { res.insert(*it); break; } } } // Printing intersection result cout << "Intersection MultiMap:" << endl; for (const auto& pair : res) { cout << pair.first << ": " << pair.second << endl; } return 0; } OutputIntersection MultiMap: 2: Python 4: JavaScript Time Complexity: O(min(N, M), where N is the number of elements in multi1 and M is the number of elements in multi2.Auxilliary Space: O(K), where K is the number of common elements. Comment More infoAdvertise with us Next Article How to Find Intersection of Two Sets in C++? A anjalibo6rb0 Follow Improve Article Tags : C++ Programs C++ STL cpp-multimap CPP Examples +1 More Practice Tags : CPPSTL Similar Reads How to Find the Intersection of Two Maps in C++? In C++, a map is a container that stores elements in the form of key and value pairs. Intersection means the elements that are common between two datasets. In this article, we will learn how to find the intersection of two maps in C++ STL. Example: Input: map1 = {{“appleâ€, 1}, {“bananaâ€, 2}, {“cherr 3 min read How to Find Intersection of Two Multisets in C++? In C++, multisets are a type of associative container similar to the set, with the exception that multiple elements can have the same values. Intersection means the elements that are common between two datasets. In this article, we will see how to find the intersection of two Multisets in C++. Examp 3 min read How to Find Intersection of Two Sets in C++? In C++, sets are containers that store unique elements following a specific order. The intersection of two datasets includes all the elements that are common in both sets. In this article, we will learn how to find the intersection of two sets in C++ STL. Example:Input: mySet1 = {10,20,30,40,50,60} 2 min read How to Find the Intersection of Two Vectors in C++? Intersection of two vectors is the set of common elements in both vectors. In this article, we will learn how to find the intersection of two vectors in C++.The most efficient method to find the intersection of two vector is by using set_intersection() function. Let’s take a look at an example:C++#i 3 min read How to Find the Intersection of Two Deques in C++? In C++, a deque is a sequence container that allows insertions and deletions at both its ends i.e., the beginning and the end, and the intersection of two deques includes all the common elements in both deques. In this article, we will learn how to find the intersection of two deques in C++. Example 2 min read How to Find the Union of Two Multimaps in C++? In C++, finding the union of two multimaps consists of combining the elements from both multimap collections while considering the duplicates as a multimap allows multiple values to have the same key. In this article, we will learn to find the union of two multimaps in C++. Example:Input: multi1 = { 2 min read Like