How to Create a Map with Vectors as Keys and Sets as Values?

In C++, maps, vectors, and sets all are the data storage containers that are provided by the C++ STL. We can nest these containers to create a more complex data structure. In this article, we will explore how to create a Map with vectors as keys and sets as values in C++.

Example

Input:
myVector1 = {1, 2, 3}
myVector2 = {4, 5, 6}
myVector3 = {7, 8, 9}
mySet1 = {"Geek", "for", "Geeks"}
mySet2 = {"C","C++","Java"}
mySet3 = {"AI","ML","Data Science"}

Output:
myMap = { {{1, 2, 3}: {"Geek", "for", "Geeks"}},
                     {{4, 5, 6}: {"C","C++","Java"}},
                     {{7, 8, 9}: {"AI","ML","Data Science"}} }

Map with Vectors as Keys and Sets as Values in C++

To create a map with vectors as keys and sets as values, we first declare the map of type as shown below:

Syntax:

Map<vector<data_Type>, set<data_Type>> myMap

The we can insert the set with its vector one by one.

C++ Program to Create a Map with Vectors as Keys and Sets as Values

// C++ Program to show how to Create a Map with Vectors as
// Keys and Sets as Values
#include <iostream>
#include <map>
#include <set>
#include <vector>

using namespace std;

int main()
{

    // Initialzie  the map with vector keys and set values
    map<vector<int>, set<string> > myMap;

    // Create the vectors which will act as keys in the map
    vector<int> v1 = { 1, 2, 3 };
    vector<int> v2 = { 4, 5, 6 };
    vector<int> v3 = { 7, 8, 9 };

    // Create the sets which will act as values in the map
    set<string> s1 = { "Geek", "for", "Geeks" };
    set<string> s2 = { "C", "C++", "Java" };
    set<string> s3 = { "AI", "ML", "Data Science" };

    // Insert key-value pairs into the map
    myMap[v1] = s1;
    myMap[v2] = s2;
    myMap[v3] = s3;

    // Print key-value pairs of the map
    for (const auto& pair : myMap) {
        cout << "Key: ";
        for (int key : pair.first) {
            cout << key << " ";
        }
        cout << " Value: {";
        for (const string& value : pair.second) {
            cout << value << ", ";
        }
        cout << "}" << endl;
    }

    return 0;
}

Key: 1 2 3  Value: {Geek, Geeks, for, }
Key: 4 5 6  Value: {C, C++, Java, }
Key: 7 8 9  Value: {AI, Data Science, ML, }

Time Complexity: O(N) where N is the number of pairs in the map.

Auxiliary Space: O(N*(M+K)) where N is the number of key-value pairs in the map , M is the average size of the vectors used as keys and K is the average size of the sets uses as values.