How do I merge two containers efficiently with std::map for large datasets?

When dealing with large datasets in C++, merging two containers efficiently using `std::map` can be achieved through a few key strategies. Here is a concise method to merge them while maintaining efficiency.

Example of Merging Two std::map Containers


        #include 
        #include 

        int main() {
            std::map map1 = {
                {1, "One"},
                {2, "Two"},
                {3, "Three"}
            };

            std::map map2 = {
                {2, "Deux"},
                {4, "Four"}
            };

            // Merging map2 into map1
            for (const auto& pair : map2) {
                map1[pair.first] = pair.second; // This will overwrite if key exists
            }

            // Displaying the merged map
            for (const auto& pair : map1) {
                std::cout << pair.first << ": " << pair.second << std::endl;
            }

            return 0;
        }

How do I merge two containers efficiently with std::map for large datasets?

Example of Merging Two std::map Containers

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How do I merge two containers efficiently with std::map for large datasets?

Example of Merging Two std::map Containers

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